Submission #887700

#	Time	Username	Problem	Language	Result	Execution time	Memory
887700		duckindog	Bank (IZhO14_bank)	C++14	52 / 100	318 ms	752 KiB

bank

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

using namespace std;

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

int d[1010][N];
bool sub1(int i, int j) {
  if (i == 0) return 1;
  if (i < 0) return 0;
  int &ret = d[i][j];
  if (ret > -1) return ret; ret = 0;
  for (int t = j + 1; t <= m; ++t)
    ret |= sub1(i -= b[j], t);
  return ret;
}

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

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

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

  if (n == 1) {
    memset(d, -1, sizeof d);
    cout << (sub1(a[1], 0) == 1 ? "YES" : "NO");
    return 0;
  }

  for (int mask = 1; mask <= (1 << m) - 1; ++mask) {
    for (int s = 0; s < mask; ++s) {
      if (f[s] == n) continue;
      if ((s | mask) != mask) continue;
      int t = ((s & mask) ^ mask);
      int val = 0;
      for (int i = 1; i <= m; ++i) if ((t >> i - 1) & 1) val += b[i];
      if (val == a[f[s] + 1]) f[mask] = max(f[mask], f[s] + 1);
    }
  }
  for (int mask = 1; mask <= (1 << m) - 1; ++mask) {
    if (f[mask] == n) {
      cout << "YES";
      return 0;
    }
  }
  cout << "NO";
}

Compilation message (stderr)

bank.cpp: In function 'bool sub1(int, int)':
bank.cpp:17:3: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   17 |   if (ret > -1) return ret; ret = 0;
      |   ^~
bank.cpp:17:29: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   17 |   if (ret > -1) return ret; ret = 0;
      |                             ^~~
bank.cpp: In function 'int32_t main()':
bank.cpp:47:48: warning: suggest parentheses around '-' inside '>>' [-Wparentheses]
   47 |       for (int i = 1; i <= m; ++i) if ((t >> i - 1) & 1) val += b[i];
      |                                              ~~^~~
bank.cpp:27:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |     freopen("duck.inp", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
bank.cpp:28:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |     freopen("duck.out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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