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41_firstMissingPositive.go

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package main

import "fmt"

func main() {

nums := []int{3, 4, -1, 1}

fmt.Println(nums)

fmt.Println(firstMissingPositive(nums))

}

func firstMissingPositive(nums []int) int {

ln := len(nums)

for i := 0; i < ln; i++ {

for nums[i] <= ln && nums[i] > 0 && nums[nums[i]-1] != nums[i] {

nums = mySwap(nums, i, nums[i]-1)

fmt.Println(nums)

}

}

fmt.Println(nums)

for i := 0; i < ln; i++ {

if nums[i] != i+1 {

return i + 1

}

}

return ln + 1

}

func mySwap(nums []int, i int, j int) []int {

tmp := nums[i]

nums[i] = nums[j]

nums[j] = tmp

return nums

}