二维数组旋转，类似2D图像作90度旋转
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package main
import (
"fmt"
)
func main() {
matrix := [][]int{{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}
fmt.Println(matrix)
rotate(matrix)
fmt.Println(matrix)
}
func rotate(matrix [][]int) {
m := len(matrix)
tmp := 0
for i := 0; i < m/2; i++ {
for j := i; j < m-1-i; j++ {
tmp = matrix[i][j]
matrix[i][j] = matrix[m-1-j][i]
matrix[m-1-j][i] = matrix[m-1-i][m-1-j]
matrix[m-1-i][m-1-j] = matrix[j][m-1-i]
matrix[j][m-1-i] = tmp
}
}
}
输出：
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2
[[1 2 3] [4 5 6] [7 8 9]]
[[7 4 1] [8 5 2] [9 6 3]]
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