go算法-一次遍历求出第二大的值

package main

import (
    "fmt"
    "math"
)

func main() {
    a := []int{1, 4, 3, 3, 7, 2, 1, 10}
    maxNum := a[0]
    second := math.MinInt64
    for _, v := range a {
        if v > maxNum {
            second = maxNum
            maxNum = v
        }

    }
    fmt.Println(maxNum, second)
}