Submission #844435

#	Time	Username	Problem	Language	Result	Execution time	Memory
844435		vjudge1	Nivelle (COCI20_nivelle)	C++17	110 / 110	884 ms	24916 KiB

nivelle

#include <bits/stdc++.h>
#define endl "\n"
#define pb push_back
#define int long long
using namespace std;

const int inf = 2e18 + 5;
const int N = 2e5 + 5;
const int mod = 1e9 + 7;

int32_t main(){
  //freopen("in.txt","r", stdin);
  int n;
  cin>>n;
  string s;
  cin>>s;

  int mx = 0;
  vector<vector<int> > pre(n+1, vector<int>(26));
  for(int i = 0; i < n; i++){
    mx = max(mx, (int)(s[i] - 'a'));
    for(int j = 0; j < 26; j++){
        pre[i+1][j] = pre[i][j] + (s[i] == (char)('a' + j));
    }
  }

  pair<int, int> best = {1, 1};
  int bl = 1, br = 1;

  for(int i = 1; i <= 26; i++){
    for(int j = 0; j < n; j++){
        int lint = 0;
        int l = j+1, r = n+1;
        while(l < r){
            int m = (l + r)/2;

            int s = 0;
            for(int k = 0; k < 26; k++){
                s += (pre[m][k] > pre[j][k]);
            }

            if(s <= i){
                lint = max(lint, m);
                l = m + 1;
            }
            else{
                r = m;
            }
        }
        pair<int, int> op = {lint - j, i};
        if(best.first * op.second < best.second * op.first){
            bl = j+1, br = lint;
            best = op;
        }
    }
  }

  cout<<bl<<" "<<br<<endl;
  return 0;
}

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