Submission #482516

#	Time	Username	Problem	Language	Result	Execution time	Memory
482516		chenwz	Genetics (BOI18_genetics)	C++11	100 / 100	783 ms	73192 KiB

genetics

#include <bits/stdc++.h>
typedef long long LL;
#define _for(i, a, b) for (int i = (a); i < (int)(b); ++i)
using namespace std;
const int NN = 4100 + 4;
int V[NN][NN];
LL Sum[NN][4], W[NN];
LL randl() { return ((LL)rand() << 32) + rand(); }
map<char, int> CM = {{'A', 0}, {'C', 1}, {'G', 2}, {'T', 3}};
int main() {
  ios::sync_with_stdio(false), cin.tie(0);
  LL n, m, k, ans = 0;
  cin >> n >> m >> k;
  string s;
  _for(i, 0, n) {
    W[i] = randl(), cin >> s;
    _for(j, 0, m) {
      int &v = V[i][j];
      v = CM[s[j]];
      for (int c = 0; c < 4; c++)
        if (c != v)
          Sum[j][c] += W[i];
    }
    ans += W[i] * k;
  }
  _for(i, 0, n) {
    LL s = W[i] * k;
    _for(j, 0, m) s += Sum[j][V[i][j]];
    if (s == ans) {
      cout << i + 1 << endl;
      break;
    }
  }
  return 0;
}

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