Envío 5050

Código

package main

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

func main() {
	reader := bufio.NewReader(os.Stdin)

	number, _ := reader.ReadString('\n')
	number = strings.ReplaceAll(number, "\n", "")
	numberArrayS, _ := reader.ReadString('\n')
	numberArrayS = strings.ReplaceAll(numberArrayS, "\n", "")
	numbersArray := strings.Split(numberArrayS, " ")
	index := len(numbersArray) - 1
	result := -1

	var sumTotal int64 = 0
	var sumLeft int64 = 0

	for i := 0; i < len(numbersArray); i++ {
		numberIndex, _ := strconv.ParseInt(numbersArray[index], 10, 64)
		sumTotal += numberIndex
	}

	for result == -1 && index > 0 {
		numberIndex, _ := strconv.ParseInt(numbersArray[index], 10, 64)
		sumLeft += numberIndex
		sumTotal -= numberIndex
		if sumLeft < 0 && sumTotal > 0 {
			result = index
		}

	}
	if result == -1 {
		fmt.Println("Impossible")
	} else {
		fmt.Println(result)
	}

}