Submission #899593

#	Time	Username	Problem	Language	Result	Execution time	Memory
899593		duckindog	Kutije (COCI21_kutije)	C++14	70 / 70	125 ms	9556 KiB

Main

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

using namespace std;

const int N = 1e3 + 10;
int n, m, q;
int par[N];
int root(int u) {
  return (par[u] < 0 ? u : par[u] = root(par[u]));
}
void add(int u, int v) {
  u = root(u); v = root(v);
  if (u == v) return;
  if (par[u] >= par[v]) swap(u, v);
  par[u] += par[v];
  par[v] = u;
}

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

  if (fopen("duck.inp", "r")) {
    freopen("duck.inp", "r", stdin);
    freopen("duck.out", "w", stdout);
  }
  memset(par, -1, sizeof par);
  cin >> n >> m >> q;

  for (int i = 1; i <= m; ++i) {
    for (int j = 1; j <= n; ++j) {
      int p; cin >> p;
      add(j, p);
    }
  }

  while(q--) {
    int x, y; cin >> x >> y;
    cout << (root(x) == root(y) ? "DA" : "NE") << '\n';
  }

}

Compilation message (stderr)

Main.cpp: In function 'int32_t main()':
Main.cpp:24:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |     freopen("duck.inp", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:25:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |     freopen("duck.out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 15 / 15
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 35 / 35