【HDOJ】1203 I NEED A OFFER!

DP问题。

#include <stdio.h>

#define MAXNUM 10002

int main() {
    int m, n;
    int cost[MAXNUM];    // the Cost for every school
    float prob[MAXNUM];  // the probality for every school
    float probs[MAXNUM]; // the probality for All-amount-money
    int i, j;

    while ( scanf("%d %d", &n, &m)!=EOF && (m||n)) {
        for (i=0; i<m; ++i) {
            scanf("%d %f", &cost[i], &prob[i]);
            prob[i] = 1.0f - prob[i];
        }

        for (i=0; i<=n; i++)
            probs[i] = 1.0f;

        for (i=0; i<m; ++i) {
            for (j=n; j>=cost[i]; --j) {
                if (probs[j-cost[i]] * prob[i] < probs[j])
                    probs[j] = probs[j-cost[i]] * prob[i];
            }
        }


        printf("%.1f%%\n", (1.0f-probs[n])*100.0f);
    }

    return 0;
}