Submission #853521

#	Time	Username	Problem	Language	Result	Execution time	Memory
853521		Trisanu_Das	Genetics (BOI18_genetics)	C++17	100 / 100	503 ms	33648 KiB

genetics

// Editorial OP!
#include <bits/stdc++.h>
using namespace std;
 
const int N = 4105;
 
int n, m, k, sum[N], val[N], f[4][N];
char a[N][N];
 
int toint (char c) {
    if (c == 'A') return 0;
    if (c == 'C') return 1;
    if (c == 'G') return 2;
    return 3;
}
 
int main(){
    mt19937 rd(chrono::steady_clock::now().time_since_epoch().count());
    cin >> n >> m >> k;
    for (int i = 1; i <= n; i++) cin >> a[i];
    for (int i = 1; i <= n; i++) val[i] = rd() % 100000 + 1;
    for (int i = 0; i < m; i++)  for (int j = 1; j <= n; j++)  f[toint(a[j][i])][i] += val[j];
    for (int i = 1; i <= n; i++) {
        for (int j = 0; j < m; j++)  for (int k = 0; k < 4; k++)  if (k != toint(a[i][j])) sum[i] += f[k][j];
        int cur = 0;
        for (int j = 1; j <= n; j++) if (i != j) cur += val[j];
        if (sum[i] == k * cur) {
          cout << i << '\n'; return 0;
        }
    }
}

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