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车辚辚，马萧萧，行人弓箭各在腰。

Conway in 1970.

锦城丝管日纷纷，半入江风半入云。

Write a function to **delete a node** in a singly-linked list.

细草微风岸，危樯独夜舟。

迟日江山丽，春风花草香。

Given a string `s`, find the first non-repeating character in it and return its index.

昔闻洞庭水，今上岳阳楼。