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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10.     public static void main (String[] args) throws java.lang.Exception
  11.     {
  12.             Scanner sc = new Scanner(System.in);
  13.             sc.nextInt();
  14.             sc.nextLine();
  15.             String data = sc.nextLine();
  16.             int q = sc.nextInt();
  17.             int[][] queries = new int[q][3];
  18.             for(int i=0; i<q; i++){
  19.                 queries[i][0] = sc.nextInt();
  20.                 queries[i][1] = sc.nextInt();
  21.                 queries[i][2] = sc.nextInt();
  22.             }
  23.  
  24.             System.out.println(findDistinctCharacters(data, queries));
  25.     }
  26.     private static List<Integer> findDistinctCharacters(String data, int[][]queries){
  27.         List<Integer> ans = new ArrayList<>();
  28.         StringBuilder s = new StringBuilder(data);
  29.         for(int[] query: queries){
  30.             if(query[0] ==1){
  31.                 char rep = (char) ('a' + query[2] - 1);
  32.                 s.setCharAt(query[1]-1, rep);
  33.             }
  34.             if(query[0]==2){
  35.                 int distinct = countDistinct(s, query[1], query[2]);
  36.                 ans.add(distinct);
  37.             }
  38.         }
  39.         return ans;
  40.     }
  41.     private static int countDistinct(StringBuilder s, int l, int r){
  42.         HashSet<Character> set = new HashSet<>();
  43.         l=l-1;
  44.         r= r-1;
  45.         while(l<s.length() && l<=r){
  46.             // char curr = s.charAt(l++);
  47.             // if(!set.contains(curr)){
  48.             //     distinct++;
  49.             //     set.add(curr);
  50.             // }
  51.             set.add(s.charAt(l++));
  52.         }
  53.         return set.size();
  54.     }
  55. }
Success #stdin #stdout 0.14s 56788KB
comments (?)
stdin 
7
abccbda
5
2 3 6
1 2 3
2 2 4
1 1 5
2 1 7
stdout 
[3, 1, 5]
https://ideone.com/BtwyNE
Amazon OA question 26th brute force
language:
Java (HotSpot 12)
created:
1 day ago
visibility:
public

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