Function rotate

GeeksForGeeks/Rotate_by_90_degrees/Solution.cpp:21–40

Function to rotate the matrix by 90 degrees

//Function to rotate the matrix by 90 degrees
void rotate(vector<vector<int> >& matrix)
{
    int r=matrix.size(); //Stores no. of rows in the matrix
    int c=matrix[0].size(); //Stores no. of columns in the matrix
    for(int i=0;i<r;i++){
        for(int j=i+1;j<c;j++){
             //Swapping the element at position (i,j) with position (j,i)
            int temp=matrix[i][j];
            matrix[i][j]=matrix[j][i];
            matrix[j][i]=temp;
        }
    }
    for(int i=0;i<r/2;i++)//Loop which travels through only one half of the number of rows
    {
        for(int j=0;j<c;j++){
             //Swapping the elements in the first half of the rows with the second half of the rows
            swap(matrix[i][j],matrix[r-1-i][j]);
        }
    }
}

int main()
{