Codeforces Round #803 (Div. 2) ABCD题解

A XOR Mixup
题目链接：A

题解by：wlx

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B Rising Sand
题目链接：B
题解链接：B题题解
题解by：wushi

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C 3SUM Closure
题目链接：C
题解链接：C题题解
题解by：lyf（题解内含A-D题题解）

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D Fixed Point Guessing
题目链接：D
题目链接：D题题解
题解by：jc

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