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# include<stdio.h> # include<algorithm> # include<iostream> # include<string.h> # include<map> # include<set> # include<vector> using namespace std; struct node { int h; int w; }; struct node a[100010],b[100010]; bool cmp(node a1,node a2) { if(a1.h==a2.h) return a1.w<a2.w; return a1.h<a2.h; } int main() { int t,i,n,p; multiset<int>num;///可以插入相同元素,set只能插入不同元素 multiset<int>::iterator it; scanf("%d",&t); while(t--) { scanf("%d",&n); for(i=0; i<n; i++) scanf("%d%d",&a[i].h,&a[i].w); for(i=0; i<n; i++) scanf("%d%d",&b[i].h,&b[i].w); sort(a,a+n,cmp); sort(b,b+n,cmp); int p=0; int ans=0; num.clear(); for(i=0; i<n; i++) { while(p<n&&a[i].h>=b[p].h) { num.insert(b[p].w); p++; } if(num.empty()) continue; it=num.upper_bound(a[i].w);///返回大于等于a[i].w的第一个元素 //set if(it!=num.begin()) { ans++; it--;///小于a[i].w num.erase(it);///相同的元素都会删除 } } printf("%d\n",ans); } return 0; }
hdu 4268 Alice and Bob(multiset)
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原文地址:http://blog.csdn.net/lp_opai/article/details/43307179