tree 1883c35b83f5c234ce776bed8f21cb1d69739a05
parent 4cca2f6225c391b63324e6eb53421560649d4f98
author zhenglu.zl <zhenglu.zl@alipay.com> 1481275442 +0800
committer zhenglu.zl <zhenglu.zl@alipay.com> 1481275442 +0800

change tail recursive -> iterate