제출 #844394

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
844394		vjudge1	Nivelle (COCI20_nivelle)	C++17	24 / 110	1072 ms	24848 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));
    }
  }

  if(mx <= 2){
     int mxlen = 1;
     int l = 1, r = 1;
     int lst = s[0] - 'a', len = 1;

     for(int i = 1; i < n; i++){
        if(s[i] - 'a' != lst){
            if(len > mxlen){
                r = i;
                l = i - len + 1;
                mxlen = len;
            }
            if(s[i] == 'b') lst = 1;
            else lst = 0;
            len = 1;
        }
        else{
            len++;
        }
     }

     if(len > mxlen){
        r = n;
        l = n - len + 1;
        mxlen = len;
      }

     cout<<l<<" "<<r<<endl;
     return 0;
  }

  pair<int, int> best = {1, 1};
  int l = 1, r = 1;

  for(int i = 0; i < n; i++){
    for(int j = i+1; j <= n; j++){
        int df = 0, len = j - i;
        for(int k = 0; k < 26; k++){
            if(pre[j][k] - pre[i][k] > 0) df++;
        }
        pair<int, int> option = {len, df};
        if(best.first * option.second < option.first * best.second){
            best = {len, df};
            r = j, l = i+1;
        }
    }
  }

  cout<<l<<" "<<r<<endl;
  return 0;
}

• Subtask 1: 7 / 7
• Subtask 2: 17 / 17
• Subtask 3: 0 / 13
• Subtask 4: 0 / 25
• Subtask 5: 0 / 48