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RotateImage.go
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RotateImage.go
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package main
import "fmt"
// 参考
// http://blog.zhulinpinyu.com/cracking%20the%20coding%20interview/2013/11/13/rotate-the-matrix-by-90-degrees/
// 顺时针旋转
func rotateImage(matrix [][]int) {
var i, j int
row := len(matrix)
// 左上角 到右下角对角线翻转。
for i = 0; i < row; i++ {
for j = i; j < len(matrix[i]); j++ {
tmp := matrix[i][j]
matrix[i][j] = matrix[j][i]
matrix[j][i] = tmp
}
}
// 行对称翻转
for i = 0; i < row; i++ {
column := len(matrix[i]) / 2
for j = 0; j < column; j++ {
i2 := row - 1 - j
tmp := matrix[i][j]
matrix[i][j] = matrix[i][i2]
matrix[i][i2] = tmp
}
}
}
func print(matrix [][]int) {
var i, j int
row := len(matrix)
for i = 0; i < row; i++ {
column := len(matrix[i])
for j = 0; j < column; j++ {
fmt.Printf("a[%d][%d] = %d\n", i, j, matrix[i][j])
}
}
}
func main() {
rotateImage([][]int{
{1, 2, 3},
{4, 5, 6},
{7, 8, 9},
})
rotateImage([][]int{
{5, 1, 9, 11},
{2, 4, 8, 10},
{13, 3, 6, 7},
{15, 14, 12, 16},
})
//var m [7][7]int
//matrixChainOrder(&m)
}