package main
import (
"fmt"
)
func printMatrix(matrix [][]int) {
rows := len(matrix)
cols := len(matrix[0])
for i := 0; i < rows; i++ {
for j := 0; j < cols; j++ {
// Pad each number to width 4
fmt.Printf("%4d", matrix[i][j])
}
fmt.Println()
}
}
func inverseMatrix(matrix [][]int) {
rows := len(matrix)
cols := len(matrix[0])
counter := 0
for i, r := 0, rows-1; i < rows; i, r = i+1, r-1 {
for j, c := 0, cols-1; j < cols; j, c = j+1, c-1 {
// swap values
matrix[i][j], matrix[r][c] = matrix[r][c], matrix[i][j]
counter++
if counter > (rows*cols)/2-1 {
return
}
}
}
}
func main() {
matrix := [][]int{
{1, 2, 3, 4},
{5, 6, 7, 8},
{9, 10, 11, 12},
}
fmt.Println("matrix:")
printMatrix(matrix)
inverseMatrix(matrix)
fmt.Println("\ninverse matrix:")
printMatrix(matrix)
}
/*
run:
matrix:
1 2 3 4
5 6 7 8
9 10 11 12
inverse matrix:
12 11 10 9
8 7 6 5
4 3 2 1
*/
