leetcode-go/helper.go

package helper

import (
	"fmt"
)

type ListNode struct {
	Val  int
	Next *ListNode
}

type TreeNode struct {
	Val   int
	Left  *TreeNode
	Right *TreeNode
}

func abs(x int) int {
	if x < 0 {
		return -x
	}
	return x
}

func maxInt(x, y int) int {
	if x > y {
		return x
	}
	return y
}

func minInt(x, y int) int {
	if x < y {
		return x
	}
	return y
}

func list2str(head *ListNode) string {
	curr := head
	str := make([]rune, 0)
	for curr != nil {
		str = append(str, rune(curr.Val+'0'))
		curr = curr.Next
	}
	return string(str)
}

func printTree(root *TreeNode) {
	if root == nil {
		return
	}
	if root.Left != nil {
		printTree(root.Left)
	}
	if root.Right != nil {
		printTree(root.Right)
	}
	fmt.Print(root.Val, " ")
}