21-12-2024-Rotate by 90 degree.cpp

//{ Driver Code Starts
#include <bits/stdc++.h>
using namespace std;


// } Driver Code Ends

class Solution {
  public:
    // Function to rotate matrix anticlockwise by 90 degrees.
    void rotateby90(vector<vector<int>>& mat) {
        // code here
        vector<vector<int>>temp = mat;
        int k = 0 ,l=0;
        for(int i = mat[0].size()-1 ;i>=0; i--){
            for(int j = 0; j<mat.size();j++){
                temp[k][l++] = mat[j][i];
            }
            k++;
            l = 0;
        }
        mat = temp;
        return  ;
    }
};


//{ Driver Code Starts.
int main() {
    int t;
    cin >> t;

    while (t--) {
        int n;
        cin >> n;
        vector<vector<int> > matrix(n);

        for (int i = 0; i < n; i++) {
            matrix[i].assign(n, 0);
            for (int j = 0; j < n; j++) {
                cin >> matrix[i][j];
            }
        }

        Solution ob;
        ob.rotateby90(matrix);
        for (int i = 0; i < n; ++i) {
            for (int j = 0; j < n; ++j)
                cout << matrix[i][j] << " ";
            cout << endl;
        }

        cout << "~"
             << "\n";
    }
    return 0;
}
// } Driver Code Ends