Submission #945204

#	Time	Username	Problem	Language	Result	Execution time	Memory
945204		LucaIlie	Genetics (BOI18_genetics)	C++17	100 / 100	448 ms	52200 KiB

genetics

#include <bits/stdc++.h>

using namespace std;

const int MAX_N = 4100;
const int MAX_M = 4100;

string s[MAX_N];
long long frecv[MAX_N][128], w[MAX_N];

int main() {
    int n, m, k;
    long long sum = 0;

    cin >> n >> m >> k;
    for ( int i = 0; i < n; i++ ) {
        cin >> s[i];
        w[i] = rand() % INT_MAX;
        for ( int j = 0; j < m; j++ )
            frecv[j][s[i][j]] += w[i];
        sum += w[i];
    }


    for ( int i = 0; i < n; i++ ) {
        long long d = 0;
        for ( int j = 0; j < m; j++ )
            d += sum - frecv[j][s[i][j]];

        if ( d == (sum - w[i]) * k ) {
            bool ok = true;
            for ( int j = 0; j < n && ok; j++ ) {
                if ( i == j )
                    continue;
                int d = 0;
                for ( int p = 0; p < m; p++ )
                    d += (s[i][p] != s[j][p]);
                if ( d != k )
                    ok = false;
            }
            if ( ok ) {
                cout << i + 1 << "\n";
                return 0;
            }
        }
    }

    return 0;
}

Compilation message (stderr)

genetics.cpp: In function 'int main()':
genetics.cpp:20:29: warning: array subscript has type 'char' [-Wchar-subscripts]
   20 |             frecv[j][s[i][j]] += w[i];
      |                             ^
genetics.cpp:28:40: warning: array subscript has type 'char' [-Wchar-subscripts]
   28 |             d += sum - frecv[j][s[i][j]];
      |                                        ^

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