Kill the monster

3 100
10 20
45 89
5  40

3 100
10 20
45 90
5 40

3 100
10 20
45 84
5 40

3
2
-1

#include<stdio.h>
#include<string.h>
int n,a[11],b[11],c[11],min;
void dfs(int cur,int hp)
{
    int i;
    if(hp<=0)
        if(cur<min)
            min=cur;
    if(cur>n)
        ;
    for(i=0;i<n;i++)
    {
        if(!c[i])
        {
            if(hp>b[i])
            {
                c[i]=1;
                dfs(cur+1,hp-a[i]);
                c[i]=0;
            }
            else
            {
                c[i]=1;
                dfs(cur+1,hp-2*a[i]);
                c[i]=0;
            }

        }
    }
}
int main()
{

    int i,m;
    while(~scanf("%d%d",&n,&m))
    {
        memset(c,0,sizeof(c));
        for(i=0;i<n;i++)
            scanf("%d%d",&a[i],&b[i]);
            min=11;
        dfs(0,m);
        if(min!=11)
        printf("%d\n",min);
        else
            printf("-1\n");
    }
return 0;
}

杭电acm 2616,布布扣,bubuko.com

杭电acm 2616

原文：http://blog.csdn.net/fanerxiaoqinnian/article/details/23620567