static int findNumOfPair ( int a [ ] , int n ) {
  Arrays . sort ( a ) ;
  int ans = 0 ;
  for ( int i = 0 ;
  i < n ;
  ++ i ) {
    if ( a [ i ] <= 0 ) continue ;
    int len = a . length ;
    int j = 0 ;
    while ( j < len ) {
      if ( a [ j ] == n ) {
        return j ;
      }
      else {
        j = j + 1 ;
      }
    }
    ans += i - j ;
  }
  return ans ;
}

static int findNumOfPair ( int a [ ] , int n ) { Arrays . sort ( a ) ; int ans = 0 ; for ( int i = 0 ; i < n ; ++ i ) { if ( a [ i ] <= 0 ) continue ; int len = a . length ; int j = 0 ; while ( j < len ) { if ( a [ j ] == n ) { return j ; } else { j = j + 1 ; } } ans += i - j ; } return ans ; }
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