标签:dp
混合的分组背包,如果任意取,就是01背包
如果至多取一个,就是普通的分组背包
如果至少一个,就要考虑第一次和非第一次拿,注意由于体积可以为0,所以先得考虑非第一次拿的,不然某组的同一个物品会被计算2次
/*************************************************************************
> File Name: hdu3535.cpp
> Author: ALex
> Mail: zchao1995@gmail.com
> Created Time: 2015年05月10日 星期日 16时06分19秒
************************************************************************/
#include <functional>
#include <algorithm>
#include <iostream>
#include <fstream>
#include <cstring>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <queue>
#include <stack>
#include <map>
#include <bitset>
#include <set>
#include <vector>
using namespace std;
const double pi = acos(-1.0);
const int inf = 0x3f3f3f3f;
const double eps = 1e-15;
typedef long long LL;
typedef pair <int, int> PLL;
int dp[110][110];
int type[110];
vector <PLL> jobs[110];
int main() {
int n, t, m, c, g;
while (~scanf("%d%d", &n, &t)) {
memset(dp, -1, sizeof(dp));
for (int i = 1; i <= n; ++i) {
jobs[i].clear();
scanf("%d%d", &m, &type[i]);
for (int j = 1; j <= m; ++j) {
scanf("%d%d", &c, &g);
jobs[i].push_back(make_pair(c, g));
}
}
for (int i = 0; i <= t; ++i) {
dp[0][i] = 0;
}
for (int i = 1; i <= n; ++i) {
int size = jobs[i].size();
if (type[i] == 0) {
for (int j = 0; j < size; ++j) {
for (int k = t; k >= jobs[i][j].first; --k) {
if (dp[i][k - jobs[i][j].first] != -1) {
dp[i][k] = max(dp[i][k], dp[i][k - jobs[i][j].first] + jobs[i][j].second);
}
if (dp[i - 1][k - jobs[i][j].first] != -1) {
dp[i][k] = max(dp[i][k], dp[i - 1][k - jobs[i][j].first] + jobs[i][j].second);
}
}
}
}
else if (type[i] == 1) {
for (int j = 0; j <= t; ++j) {
dp[i][j] = dp[i - 1][j];
}
for (int j = 0; j <= t; ++j) {
for (int k = 0; k < size; ++k) {
if (j < jobs[i][k].first) {
continue;
}
if (dp[i - 1][j - jobs[i][k].first] != -1) {
dp[i][j] = max(dp[i][j], dp[i - 1][j - jobs[i][k].first] + jobs[i][k].second);
}
}
}
}
else {
for (int j = 0; j <= t; ++j) {
dp[i][j] = dp[i - 1][j];
}
for (int j = 0; j < size; ++j) {
for (int k = t; k >= 0; --k) {
if (k < jobs[i][j].first) {
break;
}
if (dp[i][k - jobs[i][j].first] != -1) {
dp[i][k] = max(dp[i][k], dp[i][k - jobs[i][j].first] + jobs[i][j].second);
}
}
}
}
}
printf("%d\n", dp[n][t]);
}
return 0;
}
hdu3535---AreYouBusy(混合分组背包,有坑点)
标签:dp
原文地址:http://blog.csdn.net/guard_mine/article/details/45623775