main.go

package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

func main() {
	var scanner = bufio.NewScanner(os.Stdin)
	scanner.Split(bufio.ScanWords)
	var N int
	if scanner.Scan() {
		N, _ = strconv.Atoi(scanner.Text())
	}
	A := make([]int, N)
	var sum int
	for i := 0; i < N; i++ {
		if scanner.Scan() {
			A[i], _ = strconv.Atoi(scanner.Text())
			sum += A[i]
		}
	}
	x := sum / N

	var ans1 int
	for _, v := range A {
		ans1 += (v - x) * (v - x)
	}
	var ans2 int
	x++
	for _, v := range A {
		ans2 += (v - x) * (v - x)
	}
	var ans int
	if ans1 < ans2 {
		ans = ans1
	} else {
		ans = ans2
	}

	var wtr = bufio.NewWriter(os.Stdout)
	fmt.Fprintln(wtr, ans)
	_ = wtr.Flush()
}