#include<bits/stdc++.h>
#include<windows.h>
using namespace std;
struct mst{
	int a;
	int b;
	double c;
}mo[105];
bool cmp(mst x,mst y){
	return x.c>y.c;
}
bool niao[105];
int main(){
	srand(time(0));
	ofstream fout("C:/Users/fangzhixiang/Desktop/2.in");
	int n,m;
	while(1>n||n>100){
	    n=rand();
    }
    while(10>m||m>200){
	    m=rand();
    }
    cout<<n<<' '<<m<<endl;
    fout<<n<<' '<<m<<endl;
    for(int i=1;i<=n;i++){
    	while(500<mo[i].a||mo[i].a<1){
    		mo[i].a=rand();
		}
    	while(100<mo[i].b||mo[i].b<1){
    		mo[i].b=rand();
		}
    	cout<<mo[i].a<<' '<<mo[i].b<<endl;
    	fout<<mo[i].a<<' '<<mo[i].b<<endl;
    	mo[i].c=mo[i].a/mo[i].b;
	}
	int x,y;
	if(m<=25)
	while(x<10||x>100){
		x=rand();
	}
	else
	while(x<100||x>1000){
		x=rand();
	}
	while(y<10||y>1000){
		y=rand();
	}
	cout<<x<<' '<<y;
	fout<<x<<' '<<y;
    fout.close();
    sqrt(mo,mo+n,cmp);
    int ans=0;
	ofstream nout("C:/Users/fangzhixiang/Desktop/2.out");
    for(int j=1;j<=n;j++){
    	for(int i=0;i<n;i++){
    		if(niao[i]==false&&mo[i].a<m){
    			m+=mo[i].a;
    			ans+=mo[i].b;
    			niao[i]=true;
    			break;
			}else
			if(n==i){
				nout<<-1;
				cout<<-1;
				return 0;
			}
		}
	}
	if(m>=x){
		ans+=n;
		nout<<ans;
	}else{
		nout<<-1;
	} 
	nout.close();
	return 0;
}

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[Error] no matching function for call to 'sqrt(mst [105], mst*, bool (&)(mst, mst))'