Submission #1091583

#	Time	Username	Problem	Language	Result	Execution time	Memory
1091583		MateiKing80	Genetics (BOI18_genetics)	C++14	100 / 100	256 ms	33388 KiB

genetics

#include <bits/stdc++.h>

using namespace std;

using ll = long long;
#define int ll

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
int rangerng(int l, int r)
{
    return uniform_int_distribution<int> (l, r)(rng);
}

int n, m, k;
char a[4102][4102];
int Rnd[4102], P[4102];
int S[4102];

void solve()
{

    cin >> n >> m >> k;
    for(int i = 1; i <= n; i ++)
        for(int j = 1; j <= m; j ++)
            cin >> a[i][j];

    for(int j = 1; j <= m; j ++)
    {
        int All = 0;
        S['A'] = S['G'] = S['T'] = S['C'] = 0;

        for(int i = 1; i <= n; i ++)
        {
            All += Rnd[i];
            S[a[i][j]] += Rnd[i];
        }
        for(int i = 1; i <= n; i ++)
            P[i] += All - S[a[i][j]];
    }

    int Sum = 0;
    for(int i = 1; i <= n; i ++)
        Sum += 1ll * Rnd[i] * k;
    for(int i = 1; i <= n; i ++)
    {
        int w = 1ll * Rnd[i] * k;
        if(P[i] == Sum - w)
        {
            cout << i;
            return;
        }
    }

}


signed main()
{

    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    for(int i = 1; i <= 4100; i ++)
        Rnd[i] = rangerng(1, 1e18);
    solve();
    return 0;
}

Compilation message (stderr)

genetics.cpp: In function 'void solve()':
genetics.cpp:35:21: warning: array subscript has type 'char' [-Wchar-subscripts]
   35 |             S[a[i][j]] += Rnd[i];
      |               ~~~~~~^
genetics.cpp:38:35: warning: array subscript has type 'char' [-Wchar-subscripts]
   38 |             P[i] += All - S[a[i][j]];
      |                             ~~~~~~^

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