Submission #848276

#	Time	Username	Problem	Language	Result	Execution time	Memory
848276		ThegeekKnight16	Genetics (BOI18_genetics)	C++17	100 / 100	170 ms	37256 KiB

genetics

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

int32_t main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
    ll N, M, K;
    cin >> N >> M >> K;
    vector<array<ll, 26>> freq(M);
    vector<ll> v(N), freqTot(M);
    vector<string> dnas(N);
    for (auto &s : dnas) cin >> s;
    for (auto &x : v) x = (rng() % ((ll)1e9 + 10LL));
    for (int i = 0; i < N; i++)
    {
        const auto &s = dnas[i];
        for (int j = 0; s[j]; j++)
        {
            freq[j][s[j] - 'A'] += v[i]; freqTot[j] += v[i];
        }
    }

    ll soma = accumulate(v.begin(), v.end(), 0LL);
    for (int i = 0; i < N; i++)
    {
        ll atual = 0;
        const auto &s = dnas[i];
        for (int j = 0; s[j]; j++)
            atual += freqTot[j] - freq[j][s[j]-'A'];
        if (atual == (K * (soma - v[i]))) {cout << i+1 << '\n'; return 0;}
    }
}

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