comefrom: <gouthampradhan>two_pointers_SubarraysWithKDifferentIntegers_1.java
code: private int calculate(int[] A, int K) {
      int count = 0;
      int[] frequency = new int[A.length + 1];
      int currCount = 0;
      for (int i = 0, j = 0; i < A.length; i++) {
        frequency[A[i]]++;
        if (frequency[A[i]] == 1) {
          currCount++;
        }
        while (currCount > K) {
          frequency[A[j]]--;
          if (frequency[A[j]] == 0) {
            currCount--;
          }
          j++;
        }
        count += (i - j + 1);
      }
      return count;
    }
masked: private int sample_funcname ( int [ ] var_0 , int var_1 ) {
    int var_3 = 0 ;
    int [ ] var_6 = new int [ var_0 . length + 1 ] ;
    int var_7 = 0 ;
    for ( int var_8 = 0 , var_9 = 0 ;
    var_8 < var_0 . length ;
    var_8 ++ ) {
      var_6 [ var_0 [ var_8 ] ] ++ ;
      if ( var_6 [ var_0 [ var_8 ] ] == 1 ) {
        var_7 ++ ;
      }
      while ( var_7 > var_1 ) {
        var_6 [ var_0 [ var_9 ] ] -- ;
        if ( var_6 [ var_0 [ var_9 ] ] == 0 ) {
          var_7 -- ;
        }
        var_9 ++ ;
      }
      var_3 += ( var_8 - var_9 + 1 ) ;
    }
    return var_3 ;
  }
  