static int findSubarraySum ( int arr [ ] , int n , int sum ) {
  HashMap < Integer , Integer > prevSum = new HashMap < > ( ) ;
  int res = 0 ;
  int currsum = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    currsum += arr [ i ] ;
    if ( currsum == sum ) res ++ ;
    if ( prevSum . containsKey ( currsum - sum ) ) res += prevSum . get ( currsum - sum ) ;
    Integer count = prevSum . get ( currsum ) ;
    if ( count == null ) prevSum . put ( currsum , 1 ) ;
    else prevSum . put ( currsum , count + 1 ) ;
  }
  return res ;
}

static int findSubarraySum ( int arr [ ] , int n , int sum ) { HashMap < Integer , Integer > prevSum = new HashMap < > ( ) ; int res = 0 ; int currsum = 0 ; for ( int i = 0 ; i < n ; i ++ ) { currsum += arr [ i ] ; if ( currsum == sum ) res ++ ; if ( prevSum . containsKey ( currsum - sum ) ) res += prevSum . get ( currsum - sum ) ; Integer count = prevSum . get ( currsum ) ; if ( count == null ) prevSum . put ( currsum , 1 ) ; else prevSum . put ( currsum , count + 1 ) ; } return res ; }
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