Submission #1282516

#	Time	Username	Problem	Language	Result	Execution time	Memory
1282516		Yunan	은행 (IZhO14_bank)	C++20	71 / 100	1091 ms	960 KiB

bank

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

void Solve() {
    int n, m; cin >> n >> m;
    vector<int> a(n), b(m);
    for (int i = 0; i < n; ++i) {
        cin >> a[i];
    }
    for (int i = 0; i < m; ++i) {
        cin >> b[i];
    }
    int full_mask = (1 << m) - 1;
    vector<vector<bool>> group(n, vector<bool>(full_mask + 1, false));
    vector<vector<bool>> dp(n, vector<bool>(full_mask + 1, false));
    for (int i = 0; i < n; ++i) {
        for (int mask = 0; mask <= full_mask; ++mask) {
            int sum = 0;
            for (int j = 0; j < m; ++j) {
                sum += b[j] * ((mask >> j) & 1);
            }
            group[i][mask] = sum == a[i];
            if (i == 0) {
                dp[i][mask] = group[i][mask];
            }
        }
    }
    for (int i = 1; i < n; ++i) {
        for (int mask = 0; mask <= full_mask; ++mask) {
            for (int submask = mask; submask && !dp[i][mask]; submask = (submask - 1) & mask) {
                int subset = mask ^ submask;
                dp[i][mask] = group[i][subset] && dp[i - 1][submask];
            }
        }
    }
    for (int mask = 0; mask <= full_mask; ++mask) {
        if (dp[n - 1][mask]) {
            return void(cout << "YES");
        }
    }
    cout << "NO";
}

int main() {
    ios_base :: sync_with_stdio(false); cin.tie(0); cout.tie(0);
    if (fopen("test.inp", "r")) {
        freopen("test.inp", "r", stdin);
        freopen("test.out", "w", stdout);
    }
    Solve();
}

Compilation message (stderr)

bank.cpp: In function 'int main()':
bank.cpp:47:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |         freopen("test.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
bank.cpp:48:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   48 |         freopen("test.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 19 / 19
• Subtask 2: 25 / 25
• Subtask 3: 27 / 27
• Subtask 4: 0 / 29