For problem statement at 1000-1999/1600-1699/1670-1679/1674/problemE.txt this is a correct solution, but verifier at 1000-1999/1600-1699/1670-1679/1674/verifierE.go ends with wrong answer on test 1
input:
1
5
12 21 22 30 18 

expected: 11
got: 1152921504606846976

exit status 1 can you fix the verifier? package main

import (
	"bufio"
	"fmt"
	"io"
	"os"
)

func ceilDiv(x, y int) int {
	return (x + y - 1) / y
}

func main() {
	data, _ := io.ReadAll(os.Stdin)
	idx := 0
	nextInt := func() int {
		for idx < len(data) && (data[idx] < '0' || data[idx] > '9') {
			idx++
		}
		val := 0
		for idx < len(data) && data[idx] >= '0' && data[idx] <= '9' {
			val = val*10 + int(data[idx]-'0')
			idx++
		}
		return val
	}

	n := nextInt()
	a := make([]int, n)
	for i := 0; i < n; i++ {
		a[i] = nextInt()
	}

	ans := 1 << 60

	for i := 0; i+1 < n; i++ {
		t := ceilDiv(a[i], 2)
		if v := ceilDiv(a[i+1], 2); v > t {
			t = v
		}
		if v := ceilDiv(a[i]+a[i+1], 3); v > t {
			t = v
		}
		if t < ans {
			ans = t
		}
	}

	for i := 0; i+2 < n; i++ {
		t := ceilDiv(a[i]+a[i+2], 2)
		if t < ans {
			ans = t
		}
	}

	c := make([]int, n)
	for i := 0; i < n; i++ {
		c[i] = ceilDiv(a[i], 2)
	}

	pref := make([]int, n)
	if n > 0 {
		pref[0] = c[0]
		for i := 1; i < n; i++ {
			pref[i] = pref[i-1]
			if c[i] < pref[i] {
				pref[i] = c[i]
			}
		}
	}

	for j := 3; j < n; j++ {
		t := pref[j-3] + c[j]
		if t < ans {
			ans = t
		}
	}

	out := bufio.NewWriter(os.Stdout)
	fmt.Fprintln(out, ans)
	out.Flush()
}