hdu1864_简单01背包

Posted 2020-09-12 redips

/*
题目大意：一堆数，找到一个最大的和满足这个和不超过Q，题目链接
要学会分析复杂度！
*/
#include <cstdio>
#include <cstring>
#define MAX(a,b) (a>b?a:b)
const int N = 3000050;
int dp[N],data[N];
float bound;
int n,cnt;
int main(){
    char type;
    float price[3],tprice;
    while(scanf("%f%d",&bound,&n)&&n){
        int totalCnt = 1;
        for(int i=0;i<n;i++){
            scanf("%d",&cnt);
            bool flag = true;
            price[0]=price[1]=price[2]=0.0f;
            for(int j=0;j<cnt;j++){
                getchar();
                scanf("%c:%f",&type,&tprice);
                if((type!=‘A‘)&&(type!=‘B‘)&&(type!=‘C‘)) flag = false;
                else price[type-‘A‘] += tprice;
            }
            if(!flag) continue;
            if(price[0]>600||price[1]>600||price[2]>600) continue;
            float totalPrice = price[0]+price[1]+price[2];
            if(totalPrice>1000) continue;
            data[totalCnt++] = (totalPrice*100);
        }
        memset(dp,0,sizeof(dp));
        bound*=100;
        for(int i=1;i<totalCnt;i++)
            for(int v=bound;v>=data[i];v--)
                dp[v] = MAX(dp[v],dp[v-data[i]]+data[i]);
        float ans = 0.0f;
        for(int i=0;i<=bound;i++) ans=MAX(ans,dp[i]);
        printf("%.2f\n",ans/100);
    }
    return 0;
}