Write a one-pass algorithm with o (1) extra space to determine, if your path crosses itself, or not.

编写一个一趟遍历算法，并且只使用o(1)的额外空间来确定路径是否自相交。

youdao

The machine-tools industry is probably not something that crosses your mind every day.

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Cardinal O'Brien will say in his Easter Sunday homily at St Mary's Cathedral in Edinburgh that many people wear crosses "not in any ostentatious way, not in a way that might harm you at your work".

BBC: Scotland