Submission #887774

#	Time	Username	Problem	Language	Result	Execution time	Memory
887774		duckindog	Bank (IZhO14_bank)	C++14	100 / 100	91 ms	8652 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];
pair<int, int> f[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;

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

  f[0] = {1, 0};
  for (int mask = 1; mask <= (1 << m) - 1; ++mask) {
    for (int i = 1; i <= m; ++i) {
      if (!((mask >> i - 1) & 1)) continue;
      int j, t; tie(j, t) = f[mask & ~(1 << i - 1)];
      if (t + b[i] > a[j]) continue;
      int nj = (t + b[i] == a[j] ? j + 1 : j);
      int nt = (nj > j ? 0 : t + b[i]);
      f[mask] = max(f[mask],  {nj, nt});
    }
    if (f[mask].first > n) {
      cout << "YES";
      return 0;
    }
  }
  cout << "NO";
}

Compilation message (stderr)

bank.cpp: In function 'int32_t main()':
bank.cpp:26:24: warning: suggest parentheses around '-' inside '>>' [-Wparentheses]
   26 |       if (!((mask >> i - 1) & 1)) continue;
      |                      ~~^~~
bank.cpp:27:47: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   27 |       int j, t; tie(j, t) = f[mask & ~(1 << i - 1)];
      |                                             ~~^~~
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: 19 / 19
• Subtask 2: 25 / 25
• Subtask 3: 27 / 27
• Subtask 4: 29 / 29