题解 | #序列找数#

package main

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

func main() {
    input := bufio.NewScanner(os.Stdin)
    input.Scan()
    slice := strings.Split(input.Text(), " ")
    iSlice := []int{}
    for _, v := range slice{
        num, _ := strconv.Atoi(v)
        iSlice = append(iSlice, num)
    }
    sort.Ints(iSlice)
    res := 0

    for i :=0 ;i < len(iSlice); i++{
        if iSlice[i] != i {
            res = i
            break
        }
    }
    fmt.Println(res)
}