package main

import (
	"fmt"
	"math/rand"
	"time"
)

func sumArray(a [10]int) int {
	var sum int = 0
	for i := 0; i < len(a); i++ {
		sum = sum + a[i]
	}
	fmt.Println(sum)
	return sum

	// for _,val ;=range a{
	// 	sum=sum+val
	// }
}

func testArraySum() {
	// 产生随机化的种子
	rand.Seed(time.Now().Unix())
	var b [10]int
	for i := 0; i < len(b); i++ {
		b[i] = rand.Intn(100) // 产生0到100的随机数
	}
	fmt.Printf("b=%v\n", b)
	sum := sumArray(b)
	fmt.Printf("sum=%d\n", sum)
}

func twoSum(a [5]int, target int) {
	for i := 0; i < len(a); i++ {
		other := target - a[i]
		for j := i + 1; j < len(a); j++ {
			if a[j] == other {
				fmt.Printf("%d,%d\n", i, j)
			}
		}
	}
}

func testTwoSum() {
	// var b [5]int = [5]int{1, 3, 5, 8, 7, 4} // 只能少不能多array index 5 out of bounds [0:5]
	var b [5]int = [5]int{1, 3, 5, 8, 7} //
	// b := [5]int{1,3,5,8,7}
	// b := [...]int{1, 3, 5, 8, 7, 9}
	fmt.Printf("这是b:%v\n", b)
	twoSum(b, 8)
}

func main() {
	// testArraySum()
	testTwoSum()
}