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2022-construct2DArray.go
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2022-construct2DArray.go
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// https://leetcode-cn.com/problems/convert-1d-array-into-2d-array/
package main
import "fmt"
// 一维数组转二维数组。常规思路,遍历一维数组,一个个复制到二维数组里
func construct2DArray(original []int, m int, n int) [][]int {
l := len(original)
if l != m*n {
return [][]int{}
}
ret := make([][]int, m)
for i := range ret {
ret[i] = make([]int, n)
}
for i := 0; i < l; i++ {
ret[i/n][i%n] = original[i]
}
return ret
}
// 方案一提交后,发现效率很低,做了改进,改成行复制
func construct2DArray2(original []int, m int, n int) [][]int {
if len(original) != m*n {
return [][]int{}
}
ret := make([][]int, m)
for i := 0; i < m; i++ {
ret[i] = original[i*n : (i+1)*n]
}
return ret
}
func main() {
original := [][]int{{1, 2, 3, 4}, {1, 2, 3}, {1, 2}}
m := []int{2, 1, 1}
n := []int{2, 3, 1}
for i := 0; i < len(original) && i < len(m) && i < len(n); i++ {
fmt.Println(original[i], " ret:", construct2DArray(original[i], m[i], n[i]), " ret2:", construct2DArray2(original[i], m[i], n[i]))
}
}