Submission #1095249

#	Time	Username	Problem	Language	Result	Execution time	Memory
1095249		vjudge1	Genetics (BOI18_genetics)	C++17	100 / 100	329 ms	36436 KiB

genetics

#include<bits/stdc++.h>
using namespace std;
#define task "a"
#define se second
#define fi first
#define ll long long
#define ii pair<ll, ll>
const long mxN = 4100 + 7;

string s[mxN];
char chr[5] = {'A', 'T', 'G', 'C'};
int n, m;
ll sum[mxN][5], k;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    //freopen(task".INP", "r", stdin);
    //freopen(task".OUT", "w", stdout);

    cin >> n >> m >> k;
    ll ss = 0;
    for (ll i = 1; i <= n; i++)
    {
        cin >> s[i];
        for (int j = 0; j < m; j++)
        {
            for (int u = 0; u < 4; u++)
            {
                if (s[i][j] == chr[u])
                    sum[j][u] += i * i;
            }
        }
        ss += i * i * k;
    }

    for (ll i = 1; i <= n; i++)
    {
        ll val = 0;
        for (int j = 0; j < m; j++)
        {
            for (int u = 0; u < 4; u++)
            {
                if (s[i][j] != chr[u])
                    val += sum[j][u];
            }
        }

        if (val == ss - (i * i * k))
        {
            cout << i;
            return 0;
        }
    }
}

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