Sicily 1692. Cover Constraints

Time Limit: 1 secs, Memory Limit: 32 MB

Description

Tom wants to cover a rectangular floor by identical L-shape tiles without overlap. As shown below, the floor can be split into many small squares, and the L-shape tile consists of exactly four small squares. The floor of 3*8 can be completely covered by 6 L-shape tiles, but the floor of 3*7 is impossible.

Tom would like to know whether an arbitrary floor with n*m small squares can be completely covered or not. He is sure that when n and m are small he can find the answer by paper work, but when it comes to larger n and m, he has no idea to find the answer. Can you tell him?
Input

The input file will consist of several test cases. Each case consists of a single line with two positive integers m and n (1<=m<=15, 1<=n<=40).
The input is ended by m=n=0.
Output

For each case, print the word ‘YES’ in a single line if it is possible to cover the m*n floor, print ‘NO’ otherwise.
Sample Input

3 8
3 7
0 0
Sample Output

YES
NO

---

~(～￣▽￣)～ 想一想L 能构成的最小矩形是什么样的。Just do it!

#include <iostream>using namespace std;int main(){    int n, m;    while (cin >> n >> m && (n != 0 || m != 0))    {        if ((m * n) % 8 == 0 && (n != 1) && (m != 1)) // Think about it!            cout << "YES" << endl;        else            cout << "NO" << endl;    }    return 0;}