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https://github.com/Kiritow/OJ-Problems-Source.git
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105 lines
2.1 KiB
C++
105 lines
2.1 KiB
C++
#include <stdio.h>
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#include <string.h>
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#include <algorithm>
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using namespace std;
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const int L = 111111;
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int n,m,s[L];
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struct node
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{
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int l,r,c;//左右边界与连续的长度
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int ln,rn;//左右边界的值
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int ls,rs,ms,;//左右最大LCIS，和区间最大LCIS
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} a[L<<2];
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void pushup(int i)
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{
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a[i].ls = a[2*i].ls;
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a[i].rs = a[2*i+1].rs;
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a[i].ln = a[2*i].ln;
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a[i].rn = a[2*i+1].rn;
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a[i].ms = max(a[2*i].ms,a[2*i+1].ms);
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if(a[2*i].rn<a[2*i+1].ln)//如果左子树的右边界值小于右子树的左边界值，要合并左子树的右边界和右子树的左边界进行计算
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{
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if(a[2*i].ls == a[2*i].c)
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a[i].ls+=a[2*i+1].ls;
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if(a[2*i+1].rs == a[2*i+1].c)
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a[i].rs+=a[2*i].rs;
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a[i].ms = max(a[i].ms,a[2*i].rs+a[2*i+1].ls);
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}
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}
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void init(int l,int r,int i)//建树
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{
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a[i].l = l;
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a[i].r = r;
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a[i].c = r-l+1;
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if(l == r)
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{
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a[i].ln = a[i].rn = s[l];
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a[i].ls = a[i].rs = a[i].ms = 1;
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return;
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}
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int mid = (a[i].l+a[i].r)>>1;
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init(l,mid,2*i);
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init(mid+1,r,2*i+1);
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pushup(i);
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}
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void insert(int i,int t,int m)
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{
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if(a[i].l == a[i].r)
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{
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a[i].ln = a[i].rn = m;
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return;
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}
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int mid = (a[i].l+a[i].r)>>1;
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if(t<=mid)
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insert(2*i,t,m);
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if(t>mid)
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insert(2*i+1,t,m);
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pushup(i);
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}
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int query(int l,int r,int i)//查询最大的LCIS
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{
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if(a[i].l>=l && a[i].r<=r)
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{
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return a[i].ms;
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}
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int mid = (a[i].l+a[i].r)>>1,ans = 0;
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if(l<=mid)
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ans = max(ans,query(l,r,2*i));
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if(r>mid)
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ans = max(ans,query(l,r,2*i+1));
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if(a[2*i].rn < a[2*i+1].ln)
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ans = max(ans , min(mid-l+1,a[2*i].rs)+min(r-mid,a[2*i+1].ls));
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return ans;
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}
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int main()
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{
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int t,i,l,r;
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char str[5];
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scanf("%d",&t);
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while(t--)
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{
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scanf("%d%d",&n,&m);
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for(i = 1; i<=n; i++)
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scanf("%d",&s[i]);
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init(1,n,1);
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while(m--)
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{
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scanf("%s%d%d",str,&l,&r);
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if(str[0] == 'Q')
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printf("%d\n",query(l+1,r+1,1));
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else
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insert(1,l+1,r);
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}
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}
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return 0;
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}
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