问本地ICPC“计算机类”的旧任务

EN

#include <iostream>


using namespace std;


void CClass(int n, int m);


int main(void)
{
    while (true) {
        cout << "\n   Numbers please:\n";

        int n, m;
        cin >> n;
        cin >> m;
        cout << endl;

        CClass(n, m);
    }
}


void CClass(int n, int m) {
 
    int len = n * m;

    if (len == 6) {
        cout << "1.\t3.\t5.\n4.\t6.\t2.\n";
        return ;
    }
    if (len == 9) {
        cout <<"1.\t3.\t5.\n4.\t6.\t2.\n7.\t9.\t11.\n";
        return ;
    }
    if (n < 4) {
        if (m < 4) {
            cout << "- 1\n";
            return ;
        }
    }

    for (int i = 0, j = 2, k = 1; i < len; i++) {

        if (len >= j) {
            cout << j << ".\t";
            j += 2;
        }
        else {
            cout << k << ".\t";
            k += 2;
        }

        if ((i + 1) % n == 0) {
            cout << endl;
        }
    }
}