static int BridNum ( int n , int [ ] p , int sum ) {
  if ( sum % n != 0 ) return - 1 ;
  int pisl = sum / n ;
  int num = 0 ;
  for ( int i = 0 ;
  i < n - 1 ;
  i ++ ) {
    if ( p [ i ] != pisl ) {
      int part = p [ i ] ;
      for ( int j = 1 ;
      j < n - i ;
      j ++ ) {
        part += p [ i + j ] ;
        if ( part == pisl * ( j + 1 ) ) {
          num += j ;
          i += j ;
          break ;
        }
      }
    }
  }
  return num ;
}

static int BridNum ( int n , int [ ] p , int sum ) { if ( sum % n != 0 ) return - 1 ; int pisl = sum / n ; int num = 0 ; for ( int i = 0 ; i < n - 1 ; i ++ ) { if ( p [ i ] != pisl ) { int part = p [ i ] ; for ( int j = 1 ; j < n - i ; j ++ ) { part += p [ i + j ] ; if ( part == pisl * ( j + 1 ) ) { num += j ; i += j ; break ; } } } } return num ; }
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