mirror of
https://github.com/Kiritow/OJ-Problems-Source.git
synced 2024-03-22 13:11:29 +08:00
97 lines
2.0 KiB
C++
97 lines
2.0 KiB
C++
#include<iostream>
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#include<algorithm>
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#include<cstring>
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#include<string>
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#include<stdio.h>
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#include<math.h>
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#define N 20000
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#define inf 0x7ffffff
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#define eps 1e-9
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#define pi acos(-1.0)
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using namespace std;
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struct node
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{
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int x,y,flag;
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}s[2*N+5];
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bool cmp(node a,node b)
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{
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if(a.x != b.x) return a.x < b.x;
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return a.flag > b.flag;
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}
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struct tree
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{
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int l,r,flag,maxx;
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}tree[4*2*N];
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void build(int o,int l,int r)
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{
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tree[o].l = l;
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tree[o].r = r;
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tree[o].maxx = tree[o].flag = 0;
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if(l == r) return ;
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int m = (l+r)/2;
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build(2*o,l,m);
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build(2*o+1,m+1,r);
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}
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void pushup(int o)
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{
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tree[o].maxx = max(tree[2*o].maxx, tree[2*o+1].maxx );
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}
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void pushdown(int o)
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{
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if(tree[o].flag != 0)
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{
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tree[2*o].flag += tree[o].flag;
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tree[2*o+1].flag += tree[o].flag;
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tree[2*o].maxx += tree[o].flag;
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tree[2*o+1].maxx += tree[o].flag;
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tree[o].flag = 0;
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}
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}
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void update(int o,int x,int y,int v)
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{
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if(x <= tree[o].l && tree[o].r <= y)
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{
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tree[o].flag += v;
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tree[o].maxx += v;
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return;
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}
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pushdown(o);
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int m = (tree[o].l + tree[o].r)/2;
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if(x <= m) update(2*o,x,y,v);
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if(y > m) update(2*o+1,x,y,v);
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pushup(o);
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}
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int main()
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{
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int n,w,h;
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while(scanf("%d",&n))
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{
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if(n < 0) break;
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scanf("%d%d",&w,&h);
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int i;
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for(i = 0; i < n; i++)
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{
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int x,y;
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scanf("%d%d",&x,&y);
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x += N;
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y += N;
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s[2*i].x = x;
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s[2*i].y = y;
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s[2*i].flag = 1;
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s[2*i+1].x = x+w;
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s[2*i+1].y = y;
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s[2*i+1].flag = -1;
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}
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sort(s,s+2*n,cmp);
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build(1,1,2*N+1);
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int ans = 0;
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for(i = 0; i < 2*n; i++)
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{
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update(1,s[i].y, s[i].y+h ,s[i].flag);
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ans = max(ans,tree[1].maxx);
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}
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printf("%d\n",ans);
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}
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return 0;
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}
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