mirror of
https://github.com/Kiritow/OJ-Problems-Source.git
synced 2024-03-22 13:11:29 +08:00
387 lines
10 KiB
C++
387 lines
10 KiB
C++
/// General includes
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#include <cstdio>
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#include <cstdlib>
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#include <cstring>
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#include <algorithm>
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using namespace std;
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/// 最基础的线段树: 单点更新,区间运算(求和)
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namespace SegmentTree
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{
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const int MAXN = 1000100;
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const int MAXTREENODE = MAXN<<2;
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struct node
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{
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int lt,rt;
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int val;
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};
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node tree[MAXTREENODE];
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/// _internal_v is a indexer of SegmentTree. It guides the procedure to the right node.
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void build(int L,int R,int _internal_v=1) /// Build a tree, _internal_v is 1 by default.
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{
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tree[_internal_v].lt=L;
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tree[_internal_v].rt=R;
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if(L==R)
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{
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scanf("%d",&tree[_internal_v].val);
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/// Or: tree[_internal].val = VAL_BY_DEFAULT
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return;
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}
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int mid=(L+R)>>1;
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build(L,mid,_internal_v<<1);
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build(mid+1,R,_internal_v<<1|1);/// x<<1 == x*2; x<<1|1 == x*2+1; (faster == slower)
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/// SegmentTree Main Algorithm
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tree[_internal_v].val=tree[_internal_v<<1].val+tree[_internal_v<<1|1].val;
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}
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void update(int Pos,int Val,int _internal_v=1)/// Update a position, _internal_v is 1 by default.
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{
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if(tree[_internal_v].lt==tree[_internal_v].rt)
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{
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tree[_internal_v].val=Val;
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return;
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}
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/// Update Deep-Loop
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if(Pos <= tree[_internal_v<<1].rt) update(Pos,Val,_internal_v<<1);
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if(Pos >= tree[_internal_v<<1|1].lt) update(Pos,Val,_internal_v<<1|1);
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/// SegmentTree Main Algorithm
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tree[_internal_v].val = tree[_internal_v<<1].val+tree[_internal_v<<1|1].val;
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}
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int _internal_ans;
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inline void _internal_clear_ans()
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{
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_internal_ans=0;
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}
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inline int _internal_get_ans()
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{
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return _internal_ans;
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}
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void basic_query(int L,int R,int _internal_v=1)/// Query A Segment [L,R] , _internal_v is 1 by default.
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{
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if(tree[_internal_v].lt >= L && tree[_internal_v].rt <= R)
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{
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_internal_ans+=tree[_internal_v].val;
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return;
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}
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if(L <= tree[_internal_v<<1].rt) basic_query(L,R,_internal_v<<1);
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if(R >= tree[_internal_v<<1|1].lt) basic_query(L,R,_internal_v<<1|1);
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}
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int query(int L,int R)
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{
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_internal_clear_ans();
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basic_query(L,R);
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return _internal_get_ans();
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}
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}/// End of namespace SegmentTree
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/// 延迟更新: 区间运算更新(加法), 区间运算(求和)
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namespace LazySegmentTree
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{
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const int MAXN = 100100;
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const int MAXTREENODE = MAXN << 2;
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struct node
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{
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int lt,rt;
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int val;
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int add;
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};
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node tree[MAXTREENODE];
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void _internal_PushUp(int _indexer)
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{
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tree[_indexer].val=tree[_indexer<<1].val+tree[_indexer<<1|1].val;
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}
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void _internal_PushDown(int _indexer)
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{
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if(tree[_indexer].add!=0)
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{
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/// Broadcast this add value to Left and Right sub-tree node.
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tree[_indexer<<1].add+=tree[_indexer].add;
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tree[_indexer<<1|1].add+=tree[_indexer].add;
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/// Confirm this change by calculate and add changes to sub-trees.
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tree[_indexer<<1].val+=tree[_indexer].add * (tree[_indexer<<1].rt-tree[_indexer<<1].lt+1);
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tree[_indexer<<1|1].val+=tree[_indexer].add *(tree[_indexer<<1|1].rt-tree[_indexer<<1|1].lt+1);
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/// Now Clear this node's add value.
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tree[_indexer].add=0;
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}
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}
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void build(int L,int R,int _indexer=1)
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{
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tree[_indexer].lt=L;
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tree[_indexer].rt=R;
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tree[_indexer].add=0;/// This must be set to 0.
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if(L==R)
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{
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//scanf("%d",&tree[_indexer].val);
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tree[_indexer].val = 0;
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return;
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}
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int mid=(L+R)>>1;
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build(L,mid,_indexer<<1);
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build(mid+1,R,_indexer<<1|1);
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/// Update this val from down to up. (>.<)
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_internal_PushUp(_indexer);
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}
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void update(int L,int R,int ValToAdd,int _indexer=1)
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{
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/// Return when L or R exceeds range. So smart !
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if(R<tree[_indexer].lt||L>tree[_indexer].rt) return;
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if(L<=tree[_indexer].lt&&R>=tree[_indexer].rt)
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{
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/// This range is covered. So just add the 'add' value, which is called "LAZY"
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tree[_indexer].add+=ValToAdd;
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tree[_indexer].val+=ValToAdd*(tree[_indexer].rt-tree[_indexer].lt+1);
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return;
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}
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_internal_PushDown(_indexer);
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/// This ... Hum.. Seems not so clever...
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update(L,R,ValToAdd,_indexer<<1);
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update(L,R,ValToAdd,_indexer<<1|1);
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_internal_PushUp(_indexer);
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}
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int ans;
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void basic_query(int L,int R,int _indexer=1)
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{
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/// Data to find is not in this range.
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if(R<tree[_indexer].lt||L>tree[_indexer].rt) return;
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/// Data to find is right in this range , or covers this range.
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if(L<=tree[_indexer].lt&&R>=tree[_indexer].rt)
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{
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ans+=tree[_indexer].val;
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return ;
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}
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_internal_PushDown(_indexer);
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int mid=(tree[_indexer].lt+tree[_indexer].rt)>>1;
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if(R<=mid)
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basic_query(L,R,_indexer<<1);
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else if(L>mid)
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basic_query(L,R,_indexer<<1|1);
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else
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{
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basic_query(L,mid,_indexer<<1);
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basic_query(mid+1,R,_indexer<<1|1);
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}
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}
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int query(int L,int R)
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{
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ans=0;
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basic_query(L,R);
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return ans;
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}
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}/// End of namespace LazySegmentTree
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/// 延迟更新: 区间赋值更新, 区间运算(求和)
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namespace AttributeSegmentTree
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{
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const int MAXN = 100100;
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const int MAXTREENODE = MAXN << 2;
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const int ATTR_BY_DEFAULT=1;///默认初始化属性
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struct node
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{
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int lt,rt;
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int attr;
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};
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node tree[MAXTREENODE];
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void build(int L,int R,int _indexer=1)
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{
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tree[_indexer].lt=L;
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tree[_indexer].rt=R;
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tree[_indexer].attr=ATTR_BY_DEFAULT;
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if(L!=R)
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{
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int mid=(L+R)>>1;
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build(L,mid,_indexer<<1);
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build(mid+1,R,_indexer<<1|1);
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}
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}
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void update(int L,int R,int NewAttr,int _indexer=1)
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{
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if(tree[_indexer].attr==NewAttr) return; /// Same Attribute. Don't Need Change.
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if(tree[_indexer].lt==L&&tree[_indexer].rt==R)
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{
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/// Right this segment. Update.
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tree[_indexer].attr=NewAttr;
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return;
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}
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/// This segment has only 1 attribute. New attribute is different.
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/// So change this segment's manager's attribute to -1 ( Different Attribute in this segment )
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if(tree[_indexer].attr!=-1)
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{
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tree[_indexer<<1].attr=tree[_indexer<<1|1].attr=tree[_indexer].attr;
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tree[_indexer].attr=-1;
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}
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/// If This segment has already had several attributes, operate its subtree by Deep-Loop.
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int mid=(tree[_indexer].lt+tree[_indexer].rt)>>1;
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if(L>mid)
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{
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update(L,R,NewAttr,_indexer<<1|1);
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}
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else if(R<=mid)
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{
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update(L,R,NewAttr,_indexer<<1);
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}
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else
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{
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update(L,mid,NewAttr,_indexer<<1);
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update(mid+1,R,NewAttr,_indexer<<1|1);
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}
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}
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#define ValueOfAttr(Attr) (Attr)
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int AttrSumUp(int _indexer=1)
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{
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if(tree[_indexer].attr!=-1)
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{
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return ValueOfAttr(tree[_indexer].attr)*(tree[_indexer].rt-tree[_indexer].lt+1);
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}
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else
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{
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return AttrSumUp(_indexer<<1)+AttrSumUp(_indexer<<1|1);
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}
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}
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}/// End of namespace AttributeSegmentTree
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/// 区间赋值更新, 区间合并, 查找左端
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namespace AttributeMergeSegmentTree
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{
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const int MAXN = 100100;
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const int MAXTREENODE = MAXN << 3;
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const int ATTR_BY_DEFAULT=-1;///默认初始化属性 -1 无需操作 0 子树有住户离开 1 子树有住户进入
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struct node
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{
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int lt,rt;
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int lsum,rsum,sum;
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int attr;
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};
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node tree[MAXTREENODE];
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void build(int L,int R,int _indexer=1)
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{
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tree[_indexer].lt=L;
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tree[_indexer].rt=R;
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tree[_indexer].attr=ATTR_BY_DEFAULT;
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tree[_indexer].lsum=tree[_indexer].rsum=tree[_indexer].sum=R-L+1;
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if(L!=R)
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{
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int mid=(L+R)>>1;
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build(L,mid,_indexer<<1);
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build(mid+1,R,_indexer<<1|1);
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}
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}
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void update(int L,int R,int NewAttr,int _indexer=1)
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{
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if(L==tree[_indexer].lt&&R==tree[_indexer].rt)
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{
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tree[_indexer].lsum=tree[_indexer].rsum=tree[_indexer].sum=
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NewAttr==1 ? 0 : tree[_indexer].rt-tree[_indexer].lt+1 ; /// Same as R-L+1
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tree[_indexer].attr=NewAttr;
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return;
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}
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/// Push Down (updated)
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if(tree[_indexer].attr!=-1)
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{
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/// Sync the Attribute to sub-tree
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tree[_indexer<<1].attr=tree[_indexer<<1|1].attr=tree[_indexer].attr;
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tree[_indexer].attr=-1;
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tree[_indexer<<1].rsum=tree[_indexer<<1].lsum=tree[_indexer<<1].sum= tree[_indexer<<1].attr==1 ? 0 : tree[_indexer<<1].rt-tree[_indexer<<1].lt+1;
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tree[_indexer<<1|1].rsum=tree[_indexer<<1|1].lsum=tree[_indexer<<1|1].sum= tree[_indexer<<1|1].attr==1 ? 0 : tree[_indexer<<1|1].rt-tree[_indexer<<1|1].lt+1;
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}
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int mid=(tree[_indexer].lt+tree[_indexer].rt)>>1;
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if(R<=mid)
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{
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update(L,R,NewAttr,_indexer<<1);
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}
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else if(L>mid)
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{
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update(L,R,NewAttr,_indexer<<1|1);
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}
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else
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{
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update(L,mid,NewAttr,_indexer<<1);
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update(mid+1,R,NewAttr,_indexer<<1|1);
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}
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/// Push Up (updated)
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tree[_indexer].lsum=tree[_indexer<<1].lsum; /// left & left
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tree[_indexer].rsum=tree[_indexer<<1|1].rsum; /// right & right
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if(tree[_indexer<<1].lsum == tree[_indexer<<1].rt-tree[_indexer].lt+1)
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{
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/// Father.LeftSum == RightSon.LeftSum + LeftSon.LeftSum
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tree[_indexer].lsum+=tree[_indexer<<1|1].lsum;
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}
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/// Why tree[_indexer].rsum but not tree[_indexer<<1|1].rsum ???
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if(tree[_indexer].rsum==tree[_indexer<<1|1].rt-tree[_indexer<<1|1].lt+1)
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{
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/// Father.RightSum == LeftSon.RightSum + RightSon.RightSum
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tree[_indexer].rsum+=tree[_indexer<<1].rsum;
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}
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tree[_indexer].sum=max(max(tree[_indexer<<1].sum,tree[_indexer<<1|1].sum),tree[_indexer<<1].rsum+tree[_indexer<<1|1].lsum);
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}
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int query(int Val,int _indexer=1)
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{
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if(tree[_indexer].lt==tree[_indexer].rt)
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{
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return tree[_indexer].lt;
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}
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/// Push Down (updated)
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if(tree[_indexer].attr!=-1)
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{
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/// Sync the Attribute to sub-tree
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tree[_indexer<<1].attr=tree[_indexer<<1|1].attr=tree[_indexer].attr;
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tree[_indexer].attr=-1;
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tree[_indexer<<1].rsum=tree[_indexer<<1].lsum=tree[_indexer<<1].sum= tree[_indexer<<1].attr==1 ? 0 : tree[_indexer<<1].rt-tree[_indexer<<1].lt+1;
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tree[_indexer<<1|1].rsum=tree[_indexer<<1|1].lsum=tree[_indexer<<1|1].sum= tree[_indexer<<1|1].attr==1 ? 0 : tree[_indexer<<1|1].rt-tree[_indexer<<1|1].lt+1;
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}
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int Mid=(tree[_indexer].rt+tree[_indexer].lt)>>1;
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/// Left
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if(tree[_indexer<<1].sum>=Val)
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{
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return query(Val,_indexer<<1);
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}
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/// Both Left and Right
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else if(tree[_indexer<<1].rsum+tree[_indexer<<1|1].lsum >= Val)
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{
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return Mid-tree[_indexer<<1].rsum+1;
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}
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else /// Right
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{
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return query(Val,_indexer<<1|1);
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}
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}
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}/// End of namespace AttributeMergeSegmentTree
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