混合背包

混合背包模板题。

#include <iostream>
#include <cstdio>
using namespace std;
//Mystery_Sky
//
#define M 100000
int c[M], w[M];
int f[M], new_c[M], new_w[M], num[M];
bool it[M];
int v, m, tot;
int main() {
    scanf("%d%d", &v, &m);
    for(int i = 1; i <= m; i++) scanf("%d%d%d", &c[i], &w[i], &num[i]);
    for(int i = 1; i <= m; i++) {
        if(num[i] == 0) {
            it[++tot] = 1;
            new_c[tot] = c[i];
            new_w[tot] = w[i];
            continue;
        }
        if(num[i] == 1) {
            new_c[++tot] = c[i];
            new_w[tot] = w[i];
            continue;
        }
        for(int j = 1; j <= num[i]; j<<=1) {
            num[i] -= j;
            new_c[++tot] = c[i] * j;
            new_w[tot] = w[i] * j;
        }
        if(num[i]) {
            new_c[++tot] = c[i] * num[i];
            new_w[tot] = w[i] * num[i];
            num[i] = 0;
        }
    }
    for(int i = 1; i <= tot; i++) {
        if(it[i]) {
            for(int j = new_c[i]; j <= v; j++)
                f[j] = max(f[j], f[j-new_c[i]] + new_w[i]);
        }
        else 
            for(int j = v; j >= new_c[i]; j--)
                f[j] = max(f[j], f[j-new_c[i]] + new_w[i]);
    }
    printf("%d\n", f[v]);
    return 0;
}