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题目描述 When you were five years old, you watched in horror as a spiked devil murdered your parents. You would have died too, except you were saved by Ro 阅读全文
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题目描述 Leila is a Bioinformatician, interested in studying Bacterial evolution. In one experiment on a special type of Bacteria,she started from a singl 阅读全文
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题目描述 You are given an integer n.You are required to calculate (n mod 1) xor (n mod 2) xor ... xor (n mod (n - 1)) xor (n mod n).The “xor” operation me 阅读全文
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题目描述 给出正整数n和k，计算j(n,k)=k mod 1 + k mod 2 + k mod 3 +⋯+ k mod n的值。其中k mod i表示k除以i的余数。例如j(5,3)=3 mod 1 + 3 mod 2 + 3 mod 3 + 3 mod 4 + 3 mod 5 = 0 + 1 + 阅读全文
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题目描述 You are given a tree with n nodes. The weight of the i-th node is wi . Given a positive integer m,now you need to judge that for every integer i 阅读全文
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题目描述 A Light-Emitting Diode (LED) is a semiconductor light source, which emits light when an electric current of voltage higher than a threshhold is a 阅读全文
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题目描述 There are two sequences a1,a2,...,an , b1,b2,...,bn . Let . There are m operations within three kinds as following:• 1 x y: change value ax to y. 阅读全文
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#include <iostream> #include <bits/stdc++.h> using namespace std; const int maxn = 1e6 + 100; const int inf = 0x3f3f3f3f; const int mod = 998244353; t 阅读全文
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题目描述 The branch of mathematics called number theory is about properties of numbers. One of the areas that has captured the interest of number theoreti 阅读全文
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题目描述 路哥是云南中医学院大一新生，对路哥来说任何人任何物都只是他的道具而已。过程不重要，只要最后胜利是属于路哥的。路哥每次出完手就把这锅扔给别人。而他自己，深藏功与名，事了拂衣去。毕竟，深藏不露是一种卓越的才能。某天，路哥被班主任叫去清理海报。这里有一块宽为W，高为H的海报栏。以左下角为原点建立 阅读全文