分析汉诺塔递归算法的时间复杂度
http://cache.baidu.com/c?m=9d78d513d9d431dc4f9de7690c66c0171e43f0642bd6a0020ea4843ce4735a315016e4ac51540774d8d20b6c16ae394b9b802105361450b28cbb825e9afbcc2775ce6176671df55c0f834af4921132c157c009b2f95ef0ba8763cef1cf97840316d7500e7984f48f4d00639029af&p=882a9e0ecd904eaf1abbd20c42&user=baidu