04. Snake Moves

#include <iostream>
#include <string>
#include <vector>

using namespace std;

int main() {
    int row, col;
    cin >> row >> col;
    cin.ignore();

    string line;
    getline(cin, line);

    vector<vector<char>> matrix;

    int index = 0;

    for (int i = 0; i < row; i++) {
        vector<char> currentRow;
        for (int j = 0; j < col; j++) {
            if (i % 2 == 0) {
                currentRow.push_back(line[index++ % line.length()]);
            }
            else {
                currentRow.insert(currentRow.begin(), line[index++ % line.length()]);
            }
        }
        matrix.push_back(currentRow);
    }

    for (int i = 0; i < row; i++) {
        for (int j = 0; j < col; j++) {
            cout << matrix[i][j];
        }
        cout << endl;
    }

    return 0;
}