# Inplace rotate matrix 90 degree

Contributed by
Ambuj verma
Last Updated: 23 Feb, 2023
Easy
0/40
Avg time to solve 12 mins
Success Rate 80 %
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## Problem Statement

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#### For example:

``````For given 2D array :

[    [ 1,  2,  3 ],
[ 4,  5,  6 ],
[ 7,  8,  9 ]  ]

After 90 degree rotation in anti clockwise direction, it will become:

[   [ 3,  6,  9 ],
[ 2,  5,  8 ],
[ 1,  4,  7 ]   ]
``````
Detailed explanation ( Input/output format, Notes, Images )
##### Constraints:
``````1 ≤ T ≤ 50
1 ≤ N ≤ 100
1 ≤ ARR[i][j] ≤ 10^9

Time Limit: 1 sec
``````
##### Sample Input 1:
``````2
3
1  2  3
4  5  6
7  8  9
4
1  2  3  4
5  6  7  8
9 10 11 12
13 14 15 16
``````
##### Sample Output 1:
``````3  6  9
2  5  8
1  4  7
4  8 12 16
3  7 11 15
2  6 10 14
1  5  9 13
``````
##### Explanation of Input 1:
``````(i) The array has been rotated by 90 degrees in an anticlockwise direction as the first row is now the first column inverted and so on for second and third rows.

(ii) The array has been rotated by 90 degrees in an anticlockwise direction as the first row is now first column inverted and so on for second, third and fourth rows.
``````
##### Sample Input 2:
``````2
3
7  4  1
8  5  2
9  6  3
4
13  9  5  1
14  10  6  2
15 11 7 3
16 12 8 4
``````
##### Sample Output 2:
``````1  2  3
4  5  6
7  8  9
1  2  3  4
5  6  7  8
9 10 11 12
13 14 15 16
``````
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