D. Nezzar and Board - Codeforces Round #698 (Div. 2)
D. Nezzar and Board https://codeforces.com/contest/1478/problem/D 題解 題意為給出一個序列xi，你可以任意挑選兩個數x，y將2·x-y加入序列中，詢問在是否可以在序列中發現數k。 假設我們任意挑選4個數：x，y，p，q ...
原文：Codeforces Round #365 (Div. 2) D. Mishka and Interesting sum 樹狀數組
D. Mishka and Interesting sum 鏈接: http: codeforces.com problemset problem D 題意： 給一個序列 每次詢問一個區間 求區間中出現次數為偶數次的數的異或和 代碼： ...
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