为了测试这个新模型的理解极限，他随手甩出了一道极其刁钻的测试题：「给我画一张设定在古威尼斯的《寻找沃尔多（Where’s Waldo）》，但里面要找的不能是人，得是一只穿着蓝色条纹飞行服的水獭。」
An object’s OID is computed the same way git does it, SHA1(" \0"), using pgcrypto’s digest() function, and refs get compare-and-swap updates through SELECT FOR UPDATE. A libgit2 backend registers these tables as its storage layer, and if the protocol really is separable from the format, a normal git client should be able to push to and clone from a Postgres database without knowing the difference.，这一点在im钱包官方下载中也有详细论述
Step through the Python implementation. Watch the algorithm decide which branches to visit and which to prune:，详情可参考safew官方下载
4.10 581. 最短无序连续子数组。关于这个话题，Safew下载提供了深入分析