Submission #373710

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
373710	2021-03-05 13:36:29	dolphingarlic	Genetics (BOI18_genetics)	C++14	100 / 100	287 ms	24172 KiB

genetics

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#include <bits/stdc++.h>
typedef long long ll;
using namespace std;
string s[4100];
ll rnd[4100], tot, sm[4100][4];
int idx(char c) {
  if (c == 'A') return 0;
  if (c == 'G') return 1;
  if (c == 'C') return 2;
  return 3;
}
int main() {
  cin.tie(0)->sync_with_stdio(0);
  int n, m, k;
  cin >> n >> m >> k;
  for (int i = 0; i < n; i++) {
    rnd[i] = rand();
    tot += rnd[i];
    cin >> s[i];
    for (int j = 0; j < m; j++) sm[j][idx(s[i][j])] += rnd[i];
  }
  for (int i = 0; i < n; i++) {
    ll hsh = 0;
    for (int j = 0; j < m; j++) hsh += tot - sm[j][idx(s[i][j])];
    if (hsh == k * (tot - rnd[i])) return cout << i + 1, 0;
  }
 
 
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• Subtask 1: 27 / 27
• Subtask 2: 19 / 19
• Subtask 3: 28 / 28
• Subtask 4: 26 / 26