宠物小精灵之收服

https://www.acwing.com/problem/content/1024/

二维01背包

#include <bits/stdc++.h>
using namespace std;
#define IO ios::sync_with_stdio(false);cin.tie(0); cout.tie(0);
inline int lowbit(int x) { return x & (-x); }
#define ll long long
#define ull unsigned long long
#define pb push_back
#define PII pair<int, int>
#define VIT vector<int>
#define x first
#define y second
#define inf 0x3f3f3f3f 
int f[1010][510];
 
int main() {
    //freopen("in.txt", "r", stdin);
    IO;
    int v1, v2, n;
    cin >> v1 >> v2 >> n;
    for (int i = 1; i <= n; ++i) {
        int a, b;
        cin >> a >> b;
        for (int j = v1; j >= a; --j)
            for (int k = v2 - 1;  k >= b; --k)
                f[j][k] = max(f[j][k], f[j - a][k - b] + 1);
    }
    int a = f[v1][v2 - 1], b;
    for (int i = v2 - 1; i; --i) 
        if (f[v1][i] != a) {
            b = v2 - i - 1;
            break;
        }
    
    if (a == 0) b = v2;
    cout << a << ' ' << b << '\n';
    return 0;
}