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go 二维切片初始方法

func main() {
	// 方法1
	row, col := 4, 5
	var res [][]int
	for i := 0; i < row; i++ {
		inline := make([]int, col)
		res = append(answer, inline)
	}
	fmt.Println(res)

	// 方法2
	res1 := make([][]int, row)
	for i := range res1 {
		res1[i] = make([]int, col)
	}
	fmt.Println(answer1)
}
// [[0 0 0 0 0] [0 0 0 0 0] [0 0 0 0 0] [0 0 0 0 0]]

// [[0 0 0 0 0] [0 0 0 0 0] [0 0 0 0 0] [0 0 0 0 0]]

当初始长度都是0的时候

func main() {
	row, col := 0, 0
	res1 := make([][]int, row)
	for i := range res1 {
		res1[i] = make([]int, col)
	}
	a := []int{1, 2, 4}
	res1 = append(res1, a)
	res1 = append(res1, a)
	fmt.Println(res1)
	//[[1 2 4] [1 2 4]]
}