Submission #961306

#	Time	Username	Problem	Language	Result	Execution time	Memory
961306		mgch	Genetics (BOI18_genetics)	C++14	0 / 100	2007 ms	8808 KiB

genetics

#include <bits/stdc++.h>

using namespace std;

const int N = 4107, L = 26, K = 66, MOD = 1000000007;

char s[N][N];

int main() {
  //  freopen("input.txt", "r", stdin);
  //    ios::sync_with_stdio(false); cin.tie(0);
  int n, m, k;
  scanf("%d%d%d\n", &n, &m, &k);
  vector <int> ord(n), rnk(n, 0);
  iota(ord.begin(), ord.end(), 0);
  for (int i = 0; i < n; ++i) {
    scanf("%s\n", s[i]);
  }
  auto diff = [&](int x, int y) {
    int ans = 0;
    for (int i = 0; i < m; ++i) {
      ans += s[x][i] != s[y][i];
    }
    return ans;
  };
  for (int it = 0; it < 3; ++it) {
    for (int i = 0; i + 1 < (int)ord.size(); ++i) {
      if (diff(ord[i], ord[i + 1]) != k) {
        ++i;
        continue;
      }
      rnk[ord[i]] = 1;
      rnk[ord[i + 1]] = 1;
    }
    sort(ord.begin(), ord.end(), [&](int x, int y) { return rnk[x] > rnk[y]; });
    while (ord.size() > 1 && rnk[ord.back()] == 0) ord.pop_back();
    for (auto it : ord) rnk[it] = 0;
    random_shuffle(ord.begin(), ord.end());
  }
  for (int j = 0; j < (int)ord.size(); ++j) {
    int x = ord[j];
    bool ok = true;
    for (int i = 0; i < n && ok; ++i) {
      if (i == x) continue;
      if (diff(x, i) != k) ok = false;
    }
    if (ok) { cout << x + 1 << '\n'; break; }
  }
  return 0;
}

Compilation message (stderr)

genetics.cpp: In function 'int main()':
genetics.cpp:13:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |   scanf("%d%d%d\n", &n, &m, &k);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
genetics.cpp:17:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |     scanf("%s\n", s[i]);
      |     ~~~~~^~~~~~~~~~~~~~

• Subtask 1: 0 / 27
• Subtask 2: 0 / 19
• Subtask 3: 0 / 28
• Subtask 4: 0 / 26