Submission #526789

#	Time	Username	Problem	Language	Result	Execution time	Memory
526789		cig32	Nivelle (COCI20_nivelle)	C++17	110 / 110	36 ms	708 KiB

nivelle

#include "bits/stdc++.h"
#define int long long
using namespace std;
const int MAXN = 1e5 + 10;
mt19937_64 rng((int)std::chrono::steady_clock::now().time_since_epoch().count());
int rnd(int x, int y) {
  int u = uniform_int_distribution<int>(x, y)(rng);
  return u;
}
int32_t main(){
  ios::sync_with_stdio(0); cin.tie(0);
  int n;
  cin >> n;
  string s;
  cin >> s;
  double ono = 1e9;
  int opt_l = 1, opt_r = 1;
  for(int cnt=1; cnt<=26; cnt++) {
    int j=0;
    int freq[26];
    for(int i=0; i<26; i++) freq[i] = 0;
    int distin = 0;
    for(int i=1; i<=n; i++) {
      if(i>1) {
        freq[s[i-2] - 'a']--;
        if(freq[s[i-2] - 'a'] == 0) distin--;
      }
      while(j+1 <= n && distin + (freq[s[j] - 'a'] == 0) <= cnt) {
        freq[s[j] - 'a']++;
        if(freq[s[j] - 'a'] == 1) distin++;
        j++;
      }
      if(distin == cnt && i <= j) {
        if(cnt * 1.0 / (j-i+1) < ono) {
          ono = cnt * 1.0 / (j-i+1);
          opt_l = i, opt_r = j;
        }
      }
    }
  }
  cout << opt_l << ' ' << opt_r << '\n';

}  

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