● Codechef 网址：https://www.codechef.com/推荐人群：普及到提高进阶特点：印度网站，题目码量大，比赛多，时间长（可能是三天或十天），适合在日常训练的时候参加。● Leetcode 网址：https://leetcode.cn/problemset/all/特点：一个很受欢迎的在线判题系统，它提供了几千道挑战题目，这些题目可以帮助挑战者...
paulzrm:Codeforces 难题选做(1)39 赞同 · 1 评论文章 # 3.CF1616H Keep XOR Low Problem - 1616H - Codeforcescodeforces.com/problemset/problem/1616/H 题目大意: 给你n 个整数 a1,a2,⋯,an 和一个整数 x。 你需要求出 {1,2,⋯,n} 的一个子集 S,满足 S 中任意两个不同的元素 i,j...
\[f_{S,t}=f_{S,t-1}+\sum\limits_{i=1}^{|S|} (-1)^{|S|-i} \dbinom{n}{y_{|S|}-x_{s_i}} f_{S \setminus \{s_i\},t-1} \] 边界情况为 \(f_{S,- \infty}=[S= \emptyset]\)。 总时间复杂度 \(O(k 2^k (x_k+n)\)。 ABC242Ex Random Painting (2800) ...
set函数集合数据效率 小码匠 2023/11/21 3180 【推荐】全力冲刺2023年信息学CSP-J/S之:ARC164 - B 又爆零了 includeint遍历变量效率 期待本次梳理能让每一位看到文章的oier少犯低级错误,驰骋CSP-J/S赛场,打出自己应有的水平。 小码匠 2023/08/31 2420 【小码匠自习室】double的坑好深:ABC185 - C -...
不妨Ctrl+F看看有多少个考虑则复杂证容易由于最于是而我们化等等词汇。 ABC020D 题解 n∑i=1lcm{i,k}=kn∑i=1igcd{i,k}=k∑d|k1dn∑i=1i[gcd{i,k}=d]=k∑d|k⌊nd⌋∑i=1i[i⊥kd]=k∑d|k⌊nd⌋∑i=1i∑g|i,g|kdμ(g)=k∑d|k∑g|kdgμ(g)⌊ngd⌋∑i=1i=k∑T...
But many just like to mash together random ideas and ask is this setup solveable (and when they come from the same set of math constructions they usually end up recycling the same line of insights), or force a problem onto a solution while trying to hide the inspiration through contrived ...
// Problem: E - Wrapping Chocolate// Contest: AtCoder - AtCoder Beginner Contest 245// URL: https://atcoder.jp/contests/abc245/tasks/abc245_e// Memory Limit: 1024 MB// Time Limit: 4000 ms/// Powered by CP Editor (https://cpeditor.org)#include<bits/stdc++.h>#include<iostream>#...
Problem Dave is a mountaineer. He is now climbing a range of mountains. On this mountains, there are N huts located on a straight lining from east to west.. The huts are numbered sequentially from 1 to N. The west most hut is 1, the east most hut is N. The i-th hut is locate...
#include <set> #include #include <queue> #include <string> #include <bitset> const int maxn = 2e5 + 20; int a[maxn]; vector<int>da; void work() { int n; LL sum = 0; cin >> n; for (int i = 1; i <= n; ++i) { cin >...
set 实现 priority queue 实现 10 AtCoder Grand Contest 022 Problem D 10.1 题目背景 AtCoder Grand Contest 022 Problem D 10.2 题目大意 ⼀个车在0 到L 之间来回游荡,速度为1。从0 出发,L, 3L, 5L, . . . 的时间到右端点。0, 2L, 4L, . . . ...