hdu 1114 Piggy-Bank

完全背包！

#include<stdio.h>
#include<string.h>
#define MAXN 10001
#define MIN(a,b) a>b?b:a
#define INF 100000000
int dp[MAXN];
int val[501],weight[501];



int main(){
int t,n;
int e,f,rest,i,j;
while(scanf("%d",&t)==1)
{
while(t--)
{
scanf("%d%d",&e,&f);
rest=f-e;
scanf("%d",&n);
for(i=1;i<=n;i++)
scanf("%d%d",&val[i],&weight[i]);
for(i=1;i<=rest;i++)
dp[i]=INF;
dp[0]=0;
for(i=1;i<=n;i++)
for(j=weight[i];j<=rest;j++)
dp[j]=MIN(dp[j],dp[j-weight[i]]+val[i]);
if(dp[rest]<INF)
printf("The minimum amount of money in the piggy-bank is %d.\n",dp[rest]);
else
printf("This is impossible.\n");
}
}
return 0;
}