package main;

import (
	"os"
	"fmt"
)

func replaceElements(arr []int) []int {
	if len(arr) == 1 { return []int{-1} }

	var arr_size int = len(arr)
	var ret []int = make([]int, arr_size)

	var max int = 0

	var i int = arr_size - 1
	for ; i > 0; i -= 1 {
		ret[i] = max
		if arr[i] > max { max = arr[i] }
	}
	ret[0] = max

	ret[arr_size-1] = -1
	return ret
}

func main() {
	r := func (arr []int, exp []int) {
		fmt.Printf("replaceElements(%v) = %v | exp: %v\n", arr, replaceElements(arr), exp)
	}
	r([]int{17,18,5,4,6,1}, []int{18,6,6,6,1,-1})
	r([]int{400}, []int{-1})

	os.Exit(0)
}