#include<bits/stdc++.h>
using namespace std;
struct building{
	int fixed,broken;
	bool operator<(const building& p){
		return (broken-fixed)<(p.broken-p.fixed);
	}
};
int main(){
	long long total=0;
	int n;
	cin>>n;
	building build[n];
	for(int i=0;i<n;i++){
		cin>>build[i].fixed>>build[i].broken;
	}
	priority_queue<int> time;
	sort(build,build+n);
	for(int i=0;i<n;i++){
		if(build[i].broken-total-build[i].fixed<=0){
			if(time.size()==0) continue;
			else{
				if(build[i].fixed<time.top()){
					total-=time.top();
					time.pop();
				}else{
					continue;
				}
			}
		}
		total+=build[i].fixed;
		time.push(build[i].fixed);
	}
	cout<<time.size();
} 

代码如上。自己改了几次依然有一个数据是WA，请问是哪里出了问题？