【HDOJ】2191 悼念512汶川大地震遇难同胞——珍惜现在，感恩生活

多重背包。

#include <stdio.h>
#include <string.h>

int ps, hs, cs, dp[105];
int n, m;

void completePac(int p, int h) {
    int i, tmp;

    for (i=p; i<=n; ++i) {
        tmp = dp[i-p] + h;
        if (dp[i] < tmp)
            dp[i] = tmp;
    }
}

void onezeroPac(int p, int h) {
    int i, tmp;

    for (i=n; i>=p; --i) {
        tmp = dp[i-p] + h;
        if (dp[i] < tmp)
            dp[i] = tmp;
    }
}

void multiPac(int p, int h, int c) {
    int k;

    if (p*c >= n) {
        completePac(p, h);
        return ;
    }
    k = 1;
    while (k < c) {
        onezeroPac(k*p, k*h);
        c -= k;
        k *= 2;
    }
    if (c)
        onezeroPac(c*p, c*h);
}

int main() {
    int c;
    int i;

    scanf("%d", &c);

    while (c--) {
        scanf("%d %d", &n, &m);
        memset(dp, 0, sizeof(dp));
        for (i=0; i<m; ++i) {
            scanf("%d %d %d", &ps, &hs, &cs);
            multiPac(ps, hs, cs);
        }
        printf("%d
", dp[n]);
    }

    return 0;
}