题目
![](https://img.laitimes.com/img/__Qf2AjLwojIjJCLyojI0JCLiAzNfRHLGZkRGZkRfJ3bs92YsYTMfVmepNHL1EkaNlXQq5keRpHW3BjMMBjVtJWd0ckW65UbM5WOHJWa5kHT20ESjBjUIF2X0hXZ0xCMx81dvRWYoNHLrdEZwZ1Rh5WNXp1bwNjW1ZUba9VZwlHdssmch1mclRXY39CXldWYtlWPzNXZj9mcw1ycz9WL49zZuBnLygDN1IjNyEDM0IjMwEjMwIzLc52YucWbp5GZzNmLn9Gbi1yZtl2Lc9CX6MHc0RHaiojIsJye.png)
class Solution {
public:
void rotate(vector<vector<int>>& a) {
int n=a.size();
for(int i=0;i<n/2;++i)
for(int j=0;j<n;++j)
swap(a[i][j],a[n-i-1][j]);
for(int i=0;i<n;++i)
for(int j=0;j<i;++j)
swap(a[i][j],a[j][i]);
}
};