algorithm(leetcode) Rotate Image

rotateImage.go

func rotate(matrix [][]int) {

    matrixLength := len(matrix)

    for i := 0; i < matrixLength; i++ {

        for j := i; j < matrixLength; j++ {

            tmp := matrix[j][i]
            matrix[j][i] = matrix[i][j]
            matrix[i][j] = tmp

        }
    }

    for i := 0; i < matrixLength; i++ {

        for j := 0; j < matrixLength/2; j++ {

            tmp := matrix[i][j]
            matrix[i][j] = matrix[i][matrixLength-j-1]
            matrix[i][matrixLength-j-1] = tmp

        }

    }

}