tangmz/hdoj: 杭电oj刷题

tangs fa9d71a487 Clion on mac may be have a bug when exec if		7 年之前
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CMakeLists.txt	fa9d71a487 Clion on mac may be have a bug when exec if	7 年之前
main.cpp	fa9d71a487 Clion on mac may be have a bug when exec if	7 年之前