杨辉三角 && 鸽兔同校

　　杨辉三角：

　　用个以为数组直接模拟就行，只是 C++ 的高精度调了好久，后来发现能用 python ，于是试着写了写：

 1 dp = []
 2
 3 def out(L, end):
 4     for i in range(end + 1):
 5         print L[i],
 6     print
 7
 8 def clear(L, num):
 9     del L[:]
10     for i in range(num):
11         L.append(0)
12
13 def solve():
14     x = int(raw_input())
15     if x == 0:
16         return
17     else:
18         clear(dp, x)
19         dp[0] = 1
20         for i in range(0, x):
21             dp[i] = 1
22             out(dp, end = i)
23             for j in range(i, 0, -1):
24                 dp[j] += dp[j-1]
25         print
26         solve()
27
28 solve()

　　很少用 python 刷题，写得不是很好。

　　鸽兔同校：

 1 # -*- coding: utf-8 -*-
 2
 3 def solve():
 4     try:
 5         s = raw_input()
 6         n, m = s.split()
 7         n = int(n)
 8         m = int(m)
 9         if 4 * n < m or (4 * n - m) % 2 == 1 or (4 * n - m) / 2 > n:
10             print ‘Error‘
11         else:
12             a = (4 * n - m) / 2
13             b = n - a
14             print a, b
15         solve()
16     except EOFError:
17         pass
18 solve()

　　感觉自己好像在做小学的数学题似的 -_-||