# 面试题 01.07

Given an image represented by an N x N matrix, where each pixel in the image is 4 bytes, write a method to rotate the image by 90 degrees. Can you do this in place?

Example 1:

Given matrix = \[ \[1,2,3], \[4,5,6], \[7,8,9] ],

Rotate the matrix in place. It becomes: \[ \[7,4,1], \[8,5,2], \[9,6,3] ] Example 2:

Given matrix = \[ \[ 5, 1, 9,11], \[ 2, 4, 8,10], \[13, 3, 6, 7], \[15,14,12,16] ],

Rotate the matrix in place. It becomes: \[ \[15,13, 2, 5], \[14, 3, 4, 1], \[12, 6, 8, 9], \[16, 7,10,11] ]

## Solutions

* the same as `problem 48`

```cpp
class Solution {
public:
    void rotate(vector<vector<int>>& matrix) {
        reverse(matrix.begin(), matrix.end());
        for (int i = 0; i < matrix.size(); i++)
            for (int j = i + 1; j < matrix.size(); j++)
                swap(matrix[i][j], matrix[j][i]);
    }
};
```


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