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program10.java
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100 lines (67 loc) · 2.23 KB
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/*
48. Rotate Image
Medium
14.4K
641
Companies
You are given an n x n 2D matrix representing an image, rotate the image by 90 degrees (clockwise).
You have to rotate the image in-place, which means you have to modify the input 2D matrix directly. DO NOT allocate another 2D matrix and do the rotation.
Example 1:
Input: matrix = [[1,2,3],[4,5,6],[7,8,9]]
Output: [[7,4,1],[8,5,2],[9,6,3]]
Example 2:
Input: matrix = [[5,1,9,11],[2,4,8,10],[13,3,6,7],[15,14,12,16]]
Output: [[15,13,2,5],[14,3,4,1],[12,6,8,9],[16,7,10,11]]
*/
package LeetCode;
public class program10 {
static void rotate1(int[][] matrix) {
int[][] res = new int[matrix.length][matrix.length];
int x = matrix.length-1;
for(int i=0;i<matrix.length;i++){
for(int j=0;j<matrix.length;j++){
res[j][x] = matrix[i][j];
}
x--;
}
for(int i=0;i<res.length;i++){
for(int j=0;j<res.length;j++){
System.out.print(res[i][j]+" ");
}
System.out.println();
}
}
static void rotate(int[][] matrix){
//For transpose of matrix
for(int i=0;i<matrix.length;i++){
for(int j=i+1;j<matrix.length;j++){
int temp = matrix[i][j];
matrix[i][j] = matrix[j][i];
matrix[j][i] = temp;
}
}
//Reverse the columns
for(int i=0;i<matrix.length;i++){
int left = 0;
int right = matrix.length-1;
while(left <right){
int temp = matrix[i][left];
matrix[i][left] = matrix[i][right];
matrix[i][right] = temp;
left++;
right--;
}
}
for(int i=0;i<matrix.length;i++){
for(int j=0;j<matrix.length;j++){
System.out.print(matrix[i][j]+" ");
}
System.out.println();
}
}
public static void main(String[] args) {
int[][] matrix = {{1,2,3},{4,5,6},{7,8,9}};
rotate1(matrix);
rotate(matrix);
}
}