https://codeforces.com/contest/1015/problem/C

C++版本一

簡單排序

/* *@Author: STZG *@Language: C++ */ #include <bits/stdc++.h> #include<iostream> #include<algorithm> #include<cstdlib> #include<cstring> #include<cstdio> #include<string> #include<vector> #include<bitset> #include<queue> #include<deque> #include<stack> #include<cmath> #include<list> #include<map> #include<set> //#define DEBUGusing namespace std; typedef long long ll; const int N=100000+10; const double PI = acos(-1.0); const double EXP = 1E-8; const int INF = 0x3f3f3f3f; int t,n,m; int c[N]; int main() { #ifdef DEBUGfreopen("input.in", "r", stdin);//freopen("output.out", "w", stdout); #endifscanf("%d%d",&n,&m);int a,b;ll suma=0;ll sumb=0;for(int i=1;i<=n;i++){scanf("%d%d",&a,&b);c[i]=a-b;suma+=a;sumb+=b;}if(sumb>m){cout << -1 << endl;return 0;}if(suma<=m){cout << 0 << endl;return 0;}sort(c+1,c+n+1);int ans=n;for(int i=1;i<=n;i++){if(sumb+c[i]>m){ans=i;break;}else{sumb+=c[i];}}cout << n-ans+1 << endl;//cout << "Hello world!" << endl;return 0; }

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