Submission #566235

#	Time	Username	Problem	Language	Result	Execution time	Memory
566235		two_sides	Genetics (BOI18_genetics)	C++17	27 / 100	2064 ms	4900 KiB

genetics

#include <bits/stdc++.h>

using namespace std;

mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());

const int N = 4005;

string s[N];
int n, m, k;
bool used[N]; 

int calc(int i, int j) {
    int res = 0;
    for (int x = 0; x < m; x++)
        res += s[i][x] != s[j][x];
    return res;
}

int main() {
    cin.tie(0)->sync_with_stdio(0);
    cin >> n >> m >> k;
    vector<int> x, y;
    for (int i = 0; i < n; i++) {
        cin >> s[i];
        if (x.empty()) x.push_back(i);
        else y.push_back(i);
        while (x.size() && y.size()) {
            if (calc(x.back(), y.back()) == k) {
                if (!used[y.back()])
                    x.push_back(y.back());
                y.pop_back();
            } else {
                used[x.back()] = true;
                x.pop_back();
            }
        }
    }
    for (int i : x) {
        vector<int> ord(n);
        iota(ord.begin(), ord.end(), 0);
        shuffle(ord.begin(), ord.end(), rng);
        bool flag = true;
        for (int j : ord)
            if (i != j && calc(i, j) != k) {
                flag = false; break;
            }
        if (flag) return cout << i + 1, 0;
    }
}

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