HDOJ(HDU).1114 Piggy-Bank (DP 完全背包)

HDOJ(HDU).1114 Piggy-Bank (DP 完全背包)

题意分析

裸的完全背包

代码总览

#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
#define nmax 100000
#define INF 0x3f3f3f3f
using namespace std;
int we[nmax],va[nmax],dp[nmax];
struct item{
    int w;
    int v;
}arr[nmax];
int main()
{
    //freopen("in.txt","r",stdin);
    int t;
    scanf("%d",&t);
    while(t--){
        int e,f;
        scanf("%d%d",&e,&f);
        int n;
        scanf("%d",&n);
        memset(arr,0,sizeof(arr));
        memset(dp,INF,sizeof(dp));
        for(int i =1; i<=n; ++i){
            scanf("%d%d",&arr[i].v,&arr[i].w);
        }
        dp[0] = 0;
        for(int i =1 ;i<=n; ++i){
            for(int j = arr[i].w; j<=(f-e);++j)
                dp[j] = min(dp[j],dp[j-arr[i].w]+arr[i].v);
        }
        if(dp[f-e] == INF) printf("This is impossible.\n");
        else printf("The minimum amount of money in the piggy-bank is %d.\n",dp[f-e]);

    }
    return 0;
}