Submission #1263735

#	Time	Username	Problem	Language	Result	Execution time	Memory
1263735		back	Bank (IZhO14_bank)	C++20	100 / 100	276 ms	34372 KiB

bank

#include <bits/stdc++.h>
using namespace std;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int n, m;
    cin >> n >> m;
    vector<int> a(n);
    for (int &x : a) cin >> x;
    vector<int> b(m);
    for (int &x : b) cin >> x;

    int ALL = 1 << m;
    vector<int> sum(ALL, 0);
    for (int mask = 1; mask < ALL; mask++) {
        int lb = __builtin_ctz(mask);
        sum[mask] = sum[mask ^ (1<<lb)] + b[lb];
    }

    // danh sách submask có tổng = x
    unordered_map<int, vector<int>> subs;
    for (int mask = 0; mask < ALL; mask++) {
        subs[sum[mask]].push_back(mask);
    }

    vector<vector<char>> dp(n+1, vector<char>(ALL, 0));
    dp[0][0] = 1;

    for (int i = 0; i < n; i++) {
        for (int mask = 0; mask < ALL; mask++) if (dp[i][mask]) {
            for (int sub : subs[a[i]]) {
                if ((mask & sub) == 0) {
                    dp[i+1][mask | sub] = 1;
                }
            }
        }
    }

    bool ok = false;
    for (int mask = 0; mask < ALL; mask++) {
        if (dp[n][mask]) ok = true;
    }
    cout << (ok ? "YES\n" : "NO\n");
}

• Subtask 1: 19 / 19
• Subtask 2: 25 / 25
• Subtask 3: 27 / 27
• Subtask 4: 29 / 29