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Codeforces Round #628 (Div. 2) D. Ehab the Xorcist(异或,思维题)

Codeforces Round #628 (Div. 2) C.Ehab and Path-etic MEXs(图论,思维题)

Codeforces Round #622 (Div. 2) C2. Skyscrapers (hard version)(单调栈,递推)

Codeforces Round #536 (Div. 2)

Codeforces Round #621 (Div. 1 + Div. 2)

Educational Codeforces Round 85 (Div. 2) 部分题解

Codeforces Round #634 (Div. 3)