CF922B Magic Forest 题意翻译 题目大意 给定一个正整数nn ,求满足如下条件的三元组(a,b,c)(a,b,c) 的个数: 1 \le a \le b \le c \le n1≤a≤b≤c≤n a \space xor \space b \space xor \space c=0a xor b xor c=0 存在一个边长分别为a,b,ca,b,c 的三角形. 输入格式 一行一个正整数n(1 \le n \le 2500)n(1≤n≤2500) 输出格式 输出满足题意的三元组…

B. Magic Forest time limit per test 1 second memory limit per test 256 megabytes Problem Description Imp is in a magic forest, where xorangles grow (wut?) A xorangle of order n is such a non-degenerate triangle, that lengths of its sides are integers…

题目链接:点击打开链接 Imp is in a magic forest, where xorangles grow (wut?) A xorangle of order n is such a non-degenerate triangle, that lengths of its sides are integers not exceeding n, and the xor-sum of the lengths is equal to zero. Imp has to count the n…

Magic Forest 题意:就是在1 ~ n中找三个值,满足三角形的要求,同时三个数的异或运算还要为0: , where  denotes the bitwise xor of integers x and y. 我已开始没想到a^b^c=0相当于c = a^b; 这样的转化就可以是三次的变成二次的: #include <cstdio> #include <algorithm> #include <iostream> using namespace std; ];…

A Cloning Toys standard input/output 1 s, 256 MB     B Magic Forest standard input/output 1 s, 256 MB     C Cave Painting standard input/output 1 s, 256 MB     D Robot Vacuum Cleaner standard input/output 1 s, 256 MB     E Birds standard input/output…

A - Cloning Toys /* 题目大意:给出两种机器,一种能将一种原件copy出额外一种原件和一个附件, 另一种可以把一种附件copy出额外两种附件,给你一个原件, 问能否恰好变出题目要求数量的原件和附件 题解:注意当附件需求不为0的时候,原件需求必须大于1 */ #include <cstdio> #include <algorithm> int main(){ int a,b; scanf("%d%d",&a,&b); if((a-…

题目链接:http://codeforces.com/contest/922 B. Magic Forest time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Imp is in a magic forest, where xorangles grow (wut?) A xorangle of order n is such a…

[比赛链接] http://codeforces.com/contest/922 [题解] Problem A. Cloning Toys          [算法] 当y = 0 ,   不可以 当y = 1 , x不为0时 , 不可以 当 y - 1 <= x , (x - y + 1)为偶数时 , 可以 时间复杂度 : O(1) [代码] #include<bits/stdc++.h> using namespace std; template <typename T>…

There is a plethora of classification algorithms available to people who have a bit of coding experience and a set of data. A common machine learning method is the random forest, which is a good place to start. This is a use case in R of the randomFo…

Harry Potter and the Forbidden Forest Time Limit: 5000/3000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 2089    Accepted Submission(s): 702 Problem Description Harry Potter notices some Death Eaters try to slip…