static int minOperations ( int [ ] A , int n ) {
  if ( ( n & 1 ) > 0 ) return - 1 ;
  int zeros = 0 , consZeros = 0 , ones = 0 ;
  for ( int i = 0 ;
  i < n ;
  ++ i ) {
    if ( A [ i ] == 0 ) zeros ++ ;
    else ones ++ ;
    if ( i + 1 < n ) {
      if ( A [ i ] == 0 && A [ i + 1 ] == 0 ) consZeros ++ ;
    }
  }
  if ( A [ 0 ] == A [ n - 1 ] && A [ 0 ] == 0 ) consZeros ++ ;
  if ( zeros == ones ) return consZeros ;
  else return - 1 ;
}

static int minOperations ( int [ ] A , int n ) { if ( ( n & 1 ) > 0 ) return - 1 ; int zeros = 0 , consZeros = 0 , ones = 0 ; for ( int i = 0 ; i < n ; ++ i ) { if ( A [ i ] == 0 ) zeros ++ ; else ones ++ ; if ( i + 1 < n ) { if ( A [ i ] == 0 && A [ i + 1 ] == 0 ) consZeros ++ ; } } if ( A [ 0 ] == A [ n - 1 ] && A [ 0 ] == 0 ) consZeros ++ ; if ( zeros == ones ) return consZeros ; else return - 1 ; }
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