백준 BOJ 5525번 - IOIOI

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코드

import java.util.*;
 
public class Main {
   public static void main(String[] args) {
      Scanner in = new Scanner(System.in);
      int N = in.nextInt();
      int M = in.nextInt();
      char S[] = in.next().toCharArray();

      int answer = 0, count = 0;
      for(int i = 1; i < M - 1; i++) {
         if(S[i] == 'O' && S[i + 1] == 'I'){
            count++;
            if(count == N) {
               if(S[i - (N * 2 - 1)] == 'I')
                  answer++;
               count--;
            }
            i++;
         }
         else 
            count = 0; 
      }
      System.out.println(answer);
      in.close();
   }
}