Submission #887339

#	Time	Username	Problem	Language	Result	Execution time	Memory
887339		duckindog	Bank (IZhO14_bank)	C++17	25 / 100	18 ms	8540 KiB

bank

//from duckindog wth depression
#include<bits/stdc++.h>

using namespace std;

const int N = 21,
          M = (1 << 20);
int a[N], b[N];
bool f[N][M];

int32_t main() {
  cin.tie()->sync_with_stdio(0);

  if (fopen("duck.inp", "r")) {
    freopen("duck.inp", "r", stdin);
    freopen("duck.out", "w", stdout);
  }
  int n, m; cin >> n >> m;
  if (m > 10) return 0;

  for (int i = 1; i <= n; ++i) cin >> a[i];
  for (int i = 1; i <= m; ++i) cin >> b[i];

  f[0][0] = 1;
  for (int i = 1; i <= n; ++i) {
    for (int mask = 1; mask <= (1 << m) - 1; ++mask) {
      for (int s = 0; s < mask; ++s) {
        if ((s | mask) != mask) continue;
        int t = ((s & mask) ^ mask);
        int val = 0;
        for (int j = 1; j <= m; ++j)
          if (((t >> j - 1) & 1)) val += b[j];
        if (val == a[i])
          f[i][mask] |= f[i - 1][s];
      }
    }
  }

  for (int mask = 1; mask <= (1 << m) - 1; ++mask) {
    if (f[n][mask]) {
      cout << "YES";
      return 0;
    }
  }
  cout << "NO";
}

Compilation message (stderr)

bank.cpp: In function 'int32_t main()':
bank.cpp:32:24: warning: suggest parentheses around '-' inside '>>' [-Wparentheses]
   32 |           if (((t >> j - 1) & 1)) val += b[j];
      |                      ~~^~~
bank.cpp:15:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |     freopen("duck.inp", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
bank.cpp:16:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |     freopen("duck.out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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