View Code of Problem 3311

#include <algorithm>
#include <cctype>
#include <cmath>
#include <cstring>
#include <iostream>
#include <string>
#include <vector>
using namespace std;

int main()
{
    int xx[4] = {0, 1, 0, -1};
    int yy[4] = {1, 0, -1, 0};
    int cnt = 3;
    int a, b;
    cin >> a >> b;
    char arr[a + 2][b + 2];
    memset(arr, 0, sizeof(arr));
    int x = 1;
    int y = 0;
    for (int i = 0; i < a + 2; i++)
        arr[i][0] = arr[i][b + 1] = 1;
    for (int i = 0; i < b + 2; i++)
        arr[0][i] = arr[a + 1][i] = 1;
    for (int i = 0; i < a * b; i++)
    {
        if (arr[x + xx[cnt]][y + yy[cnt]] != 0)
            cnt = (cnt + 1) % 4;
        x += xx[cnt];
        y += yy[cnt];
        arr[x][y] = 'A' + (i % 26);
    }
    for (int i = 1; i < a + 1; i++)
    {
        for (int j = 1; j < b + 1; j++)
        {
            if (j != 0)
                cout << " ";
            cout << arr[i][j];
        }
        cout << endl;
    }
}