Submission #1096512

#	Time	Username	Problem	Language	Result	Execution time	Memory
1096512		Tymond	Genetics (BOI18_genetics)	C++17	46 / 100	2049 ms	18004 KiB

genetics

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
#define fi first
#define se second
#define vi vector<int>
#define vll vector<long long>
#define pii pair<int, int>
#define pll pair<long long, long long>
#define pb push_back
#define mp make_pair
#define eb emplace_back
#define all(x) (x).begin(), (x).end()
#define sz(x) (int)(x).size()
mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
mt19937_64 rng64(chrono::high_resolution_clock::now().time_since_epoch().count());
inline int rand(int l,int r){return uniform_int_distribution<int>(l, r)(rng);}
inline ll rand(ll l,ll r){return uniform_int_distribution<ll>(l, r)(rng64);}
#ifdef DEBUG
auto&operator<<(auto&o,pair<auto,auto>p){return o<<"("<<p.first<<", "<<p.second<<")";}
auto operator<<(auto&o,auto x)->decltype(x.end(),o){o<<"{";int i=0;for(auto e:x)o<<","+!i++<<e;return o<<"}";}
#define debug(X...)cerr<<"["#X"]: ",[](auto...$){((cerr<<$<<"; "),...)<<endl;}(X)
#else
#define debug(...){}
#endif
 
struct custom_hash {
    static uint64_t splitmix64(uint64_t x) {
        x += 0x9e3779b97f4a7c15;
        x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
        x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
        return x ^ (x >> 31);
    }
 
    size_t operator()(uint64_t x) const {
        static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
        return splitmix64(x + FIXED_RANDOM);
    }
};

const int MAXN = 4200;
string a[MAXN];
int cnt[MAXN][40];
int n, m, k;
vi e;

bool check(int ind){
    shuffle(all(e), rng64);
    for(auto ele : e){
        if(ele == ind){
            continue;
        }
        int l = 0;
        for(int j = 0; j < m; j++){
            if(a[ele][j] != a[ind][j]){
                l++;
            }
        }

        if(l != k){
            return false;
        }
    }
    return true;
}

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(NULL);
    cout.tie(NULL);

    cin >> n >> m >> k;
    for(int i = 1; i <= n; i++){
        cin >> a[i];
        for(int j = 0; j < m; j++){
            cnt[j][a[i][j] - 'A']++;
        }
    }

    vi p;
    for(int i = 1; i <= n; i++){
        p.pb(i);
    }
    shuffle(all(p), rng64);
    e = p;
    int wsk = 0;
    while(true){
        int i = p[wsk];
        wsk++;

        int sum = 0;
        for(int j = 0; j < m; j++){
            sum += (n - cnt[j][a[i][j] - 'A']);
        }

        if(sum != (n - 1) * k){
            continue;
        }

        if(check(i)){
            cout << i << '\n';
            return 0;
        }
    }

    return 0;
}

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