Submission #930811

#	Time	Username	Problem	Language	Result	Execution time	Memory
930811		Whisper	Nivelle (COCI20_nivelle)	C++17	110 / 110	26 ms	856 KiB

nivelle

#include <bits/stdc++.h>

using namespace std;
using ll = long long;
using str = string;
using T = tuple<double, ll, ll>;

#define int long long
#define Base 31
#define sz(a) (int)a.size()
#define FOR(i, a, b) for ( int i = a ; i <= b ; i++ )
#define FORD(i, a, b) for ( int i = b ; i >= a ; i-- )
#define REP(i, n) for ( int i = 0 ; i < n ; ++i )
#define REPD(i, n) for ( int i =  n - 1 ; ~(--i) ; )
#define all(x) x.begin() , x.end()
#define pii pair<int , int>
#define fi first
#define se second
#define Lg(x) 31 - __builtin_clz(x)

constexpr ll LINF = (1ll << 62);
constexpr int INF = (1ll << 31);
constexpr int MAX = 1e6 + 5;
constexpr int Mod = 1e9 + 7;

void setupIO( const string& PROB ){

    //Phu Trong from Nguyen Tat Thanh High School for gifted student

    cin.tie(nullptr)->sync_with_stdio(false); cout.tie(nullptr);
//    freopen( (PROB + ".inp").c_str(), "r", stdin);
//    freopen( (PROB + ".out").c_str(), "w", stdout);
    cout << fixed << setprecision(10);
}

void Whisper(){ 
    int n; string s; cin >> n >> s;
    s = '$' + s;
    int L = 1, R = 1;
    double ans = 1000000000.00;
    for ( int k = 1 ; k <= 26 ; k++ ){
        int l = 1, pl = 0, pr = 0, sz = 0, len = 0;
        vector<int> cnt(26 , 0);

        for ( int i = 1 ; i <= n ; i++ ){   
            while(l < i && sz > k){
                --cnt[s[l] - 'a']; if(cnt[s[l] - 'a'] == 0) sz--; l++;
            }
            ++cnt[s[i] - 'a']; if(cnt[s[i] - 'a'] == 1) ++sz;
            if (sz == k){
                if (i - l + 1 > len){
                    len = i - l + 1;
                    pr = i;
                    pl = l;
                }
            }
        }

        double cur = (double) k / len;
        if (cur < ans){
            L = pl;
            R = pr;
            ans = cur;
        }
        // cout << k << " " << L << " " << R << " " << ans << '\n';
    }
    cout << L << " " << R << '\n';

}   
    
signed main(){
    setupIO("Whisper");
    int Test = 1;
    // cin >> Test;
    for ( int i = 1 ; i <= Test ; i++ ){
        Whisper();
        if (i < Test) cout << '\n';
    }
}

• Subtask 1: 7 / 7
• Subtask 2: 17 / 17
• Subtask 3: 13 / 13
• Subtask 4: 25 / 25
• Subtask 5: 48 / 48