static int findSubstrings ( String s , int k ) {
  int ans = 0 ;
  int cnt [ ] = new int [ 26 ] ;
  int i , j , n = s . length ( ) ;
  for ( i = 0 ;
  i < n ;
  i ++ ) {
    Arrays . fill ( cnt , 0 ) ;
    for ( j = i ;
    j < n ;
    j ++ ) {
      cnt [ s . charAt ( j ) - 'a' ] ++ ;
      if ( cnt [ s . charAt ( j ) - 'a' ] <= k ) {
        ans ++ ;
      }
      else {
        break ;
      }
    }
  }
  return ans ;
}

static int findSubstrings ( String s , int k ) { int ans = 0 ; int cnt [ ] = new int [ 26 ] ; int i , j , n = s . length ( ) ; for ( i = 0 ; i < n ; i ++ ) { Arrays . fill ( cnt , 0 ) ; for ( j = i ; j < n ; j ++ ) { cnt [ s . charAt ( j ) - ' a ' ] ++ ; if ( cnt [ s . charAt ( j ) - ' a ' ] <= k ) { ans ++ ; } else { break ; } } } return ans ; }
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