hdu 3721 Ahui Writes Word 多重背包

刚开始是用01背包做，TLE，百度，发现这是多重背包。

ps：二进制拆分要熟练一点！！

#include <iostream>#include <cmath>#include <cstring>#include <cstdio>using namespace std;int f[10001];int n, c;int a[11][11];int main() {//freopen("1.txt", "r", stdin);char s[12];int vi, ci;while(cin >> n >> c) {memset(f, 0, sizeof(f));memset(a, 0, sizeof(a));for(int i = 0; i < n; i++) {scanf("%s%d%d", s, &vi, &ci);a[vi][ci]++;}for(int i = 0; i < 11; i++) {for(int j = 0; j < 11; j++) {if(a[i][j] == 0) continue;int count = 1;int sum = 0;while(sum < a[i][j]) {for(int k = c; k >= j * count; k--) {f[k] = max(f[k], f[k - j * count] + i * count);}sum += count;if(a[i][j] - sum < count * 2)count = a[i][j] - sum;elsecount *= 2;}}}printf("%d/n", f[c]);} return 0;}