CodeForces 507A Amr and Music （贪心）

http://codeforces.com/contest/507/problem/A

 

#include<cstdio>
#include<cstring>
#include<iostream>
#include<algorithm>
using namespace std;
struct Num
{
    int v;
    int id;
};
Num num[100+10];

int cmp1(Num a,Num b)
{
    return a.v<b.v;
}
int cmp2(Num a,Num b)
{
    return a.id<b.id;
}
int main()
{
    int n,k;
    int i,j;
    while(scanf("%d%d",&n,&k)!=EOF)
    {
        int ans=0;
        int tot=k;
        for(i=1;i<=n;i++)
        {
            scanf("%d",&num[i].v);
            num[i].id=i;
        }
        sort(num+1,num+n+1,cmp1);
        for(i=1;i<=n;i++)
        {
            if(tot-num[i].v<0) break;
            tot-=num[i].v;
            ans++;
        }
        if(ans==0) printf("0\n");
        else
        {
            printf("%d\n",ans);
            sort(num+1,num+ans+1,cmp2);
            for(i=1;i<=ans;i++)
            {
                printf("%d",num[i].id);
                if(i==ans) printf("\n");
                else printf(" ");
            }
        }
    }
}