Submission #1093631

#	Time	Username	Problem	Language	Result	Execution time	Memory
1093631		coldbr3w	Genetics (BOI18_genetics)	C++17	100 / 100	292 ms	17360 KiB

genetics

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

#define ll long long
#define pll pair<long long, long long>
#define pb push_back
#define F first
#define S second  
#define all(x) (x).begin(), (x).end()

const ll N = 4200;
const ll inf = 1e18;
const ll mod = 1e9 + 7;
const ll block = 350;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

ll get_rand(ll l, ll r) {
    assert(l <= r);
    return uniform_int_distribution<ll> (l, r)(rng);
}
ll n,m,k;
ll r[N], cnt[N], res[N];
char a[N][N];
void to_thic_cau(){
    cin >> n >> m >> k;
    for(int i = 1; i <= n;i++){
        for(int j = 1; j <= m;j++) cin >> a[i][j];
    }
    for(int i = 1; i <= n;i++) r[i] = get_rand(1,(ll)1e12);
    for(int j = 1; j <= m;j++){
        cnt['A'] = cnt['T'] = cnt['G'] = cnt['C'] = 0;
        ll tot = 0;
        for(int i = 1; i <= n;i++){
            cnt[int(a[i][j])] += r[i];
            tot += r[i];
        }
        for(int i = 1; i <= n;i++) res[i] += tot - cnt[int(a[i][j])];
    }
    ll tot = 0;
    for(int i = 1; i <= n;i++) tot += r[i];
    for(int i = 1; i <= n;i++){
        if(res[i] == (tot - r[i]) * k){
            cout << i << '\n';
            return;
        }
    }
}

signed main()   
{  
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    ll tc = 1;
    //cin >> tc;
    while(tc--) to_thic_cau();
}

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