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Codeforces Round #557 B. Double Matrix 记算法思维 常用的C++ STL Codeforces Round #553 B. Dima and a Bad XOR HYSBZ 1734 二分 2019 GDUT Rating Contest I : Problem G. Back and Forth HDU 1232 畅通工程 数论，组合数学相关 2019 GDUT Rating Contest III : Problem C. Team Tic Tac Toe
Codeforces Round #557 B. Double Matrix
记算法思维
常用的C++ STL
Codeforces Round #553 B. Dima and a Bad XOR
HYSBZ 1734 二分
2019 GDUT Rating Contest I : Problem G. Back and Forth
HDU 1232 畅通工程
数论，组合数学相关
2019 GDUT Rating Contest III : Problem C. Team Tic Tac Toe