MatrixLayerRotation.cpp

#include <bits/stdc++.h>

using namespace std;

string ltrim(const string &);
string rtrim(const string &);
vector<string> split(const string &);

// Complete the matrixRotation function below.
void matrixRotation(vector<vector<int>> matrix, int r) {

    int rot;
    int m = matrix.size(), n = matrix[0].size(), x, y;
    vector<vector<int>> result(m, vector<int>(n));
        for(int i = 0; i < m; ++i) {
            for(int j = 0; j < n; ++j) {
                
                x = min(i, m-1-i);
                y = min(j, n-1-j);
                int minInd = min(x, y);
                int maxRows = m-1-minInd;
                int maxCols = n-1-minInd;
                int rot = r % (2*maxRows+2*maxCols-4*minInd);
                x = i;
                y = j;
                while(rot--) {
                    if(x < maxRows && y == minInd) {
                        ++x;
                    }
                    else if(x == maxRows && y < maxCols) {
                        ++y;
                    }
                    else if(x > minInd && y == maxCols) {
                        --x;
                    }
                    else if(x == minInd && y > minInd) {
                        --y;
                    }
                }
                result[x][y] = matrix[i][j];
            }
        }
        for(int i = 0; i < m; ++i) {
            for(int j = 0; j < n; ++j) {
                cout<<result[i][j]<<" ";
            }
            cout<<"\n";
        }
}

int main()
{
    string mnr_temp;
    getline(cin, mnr_temp);

    vector<string> mnr = split(rtrim(mnr_temp));

    int m = stoi(mnr[0]);

    int n = stoi(mnr[1]);

    int r = stoi(mnr[2]);

    vector<vector<int>> matrix(m);

    for (int i = 0; i < m; i++) {
        matrix[i].resize(n);

        string matrix_row_temp_temp;
        getline(cin, matrix_row_temp_temp);

        vector<string> matrix_row_temp = split(rtrim(matrix_row_temp_temp));

        for (int j = 0; j < n; j++) {
            int matrix_row_item = stoi(matrix_row_temp[j]);

            matrix[i][j] = matrix_row_item;
        }
    }

    matrixRotation(matrix, r);

    return 0;
}

string ltrim(const string &str) {
    string s(str);

    s.erase(
        s.begin(),
        find_if(s.begin(), s.end(), not1(ptr_fun<int, int>(isspace)))
    );

    return s;
}

string rtrim(const string &str) {
    string s(str);

    s.erase(
        find_if(s.rbegin(), s.rend(), not1(ptr_fun<int, int>(isspace))).base(),
        s.end()
    );

    return s;
}

vector<string> split(const string &str) {
    vector<string> tokens;

    string::size_type start = 0;
    string::size_type end = 0;

    while ((end = str.find(" ", start)) != string::npos) {
        tokens.push_back(str.substr(start, end - start));

        start = end + 1;
    }

    tokens.push_back(str.substr(start));

    return tokens;
}