AcWing 9. 分组背包问题

#include <iostream>
#include <algorithm>
using namespace std;
const int N = ;
int n, m;
int v[N][N], w[N][N], s[N];
int f[N];
int main() {
    cin >> n >> m;
    for (int i = ; i <= n; i ++ ) {
        cin >> s[i];
        for (int j = ; j < s[i]; j ++ )
            cin >> v[i][j] >> w[i][j];
    }
    for (int i = ; i <= n; i ++ )
        for (int j = m; j >= ; j -- )
            for (int k = ; k < s[i]; k ++ )
                if (v[i][k] <= j)
                    f[j] = max(f[j], f[j - v[i][k]] + w[i][k]);
    cout << f[m] << endl;
    return ;
}

//01背包的变种
#include <iostream>
#include <algorithm>
using namespace std;
const int N = ;
int n, m;
int v[N], w[N];
int f[N];
int main() {
    cin >> n >> m;
    for (int i = ; i < n; i ++ ) {
        int s;
        cin >> s;
        for (int j = ; j < s; j ++ ) cin >> v[j]>>w[j];
        for (int j = m ; j >=; j --)
            for(int k = ; k<s; k++)
                if(j>=v[k])
                    f[j]=max(f[j],f[j-v[k]]+w[k]);
    }
    cout << f[m] << endl;
    return ;
}