题意:在\(x\)轴上,你刚开始在\(0\)的位置,第\(i\)次操作需要走\(A_1,...,A_i\)个单位,如果\(A_i\)为正向右走,否则向左走,求你所能走到的最大坐标. 题解:我们一步一步来看: 第一次走:\(A_1\). 第二次走:\(A_1,A_2\). . . . 第\(n\)次走:\(A_1,A_2,...,A_n\). 在某次刚开始走的时候,我们的贡献应该是上一次走完的贡献,分别加上\(A_1,...,A_i\),而最大值就产生在这个过程中,如果暴力遍历的话必然超时,我们可…

F - Valid payments 简化题意:有\(n\)种面值的货币,保证\(a[1]=1,且a[i+1]是a[i]的倍数\). 有一个价格为\(x\)元的商品,付款\(y\)元,找零\(y-x\)元. 问满足以下条件的情况下的应支付金额\(y\)有多少种? 条件一:付款和找零都使用最少的硬币数量. 条件二:在满足条件一的情况下,付款是用过的硬币面值,找零时无法使用. 考虑这个题对于条件一而言,可以归结为第\(i\)个硬币食用的个数不能超过\(a[i+1]/a[i]\),否则的话我们直接使用…

A - Happy Birthday! Time limit : 2sec / Memory limit : 1000MB Score: 100 points Problem Statement E869120's and square1001's 16-th birthday is coming soon.Takahashi from AtCoder Kingdom gave them a round cake cut into 16 equal fan-shaped pieces. E869…

没看到Beginner,然后就做啊做,发现A,B太简单了...然后想想做完算了..没想到C卡了一下,然后还是做出来了.D的话瞎想了一下,然后感觉也没问题.假装all kill.2333 AtCoder Beginner Contest 052 A题意: 输出大的面积? 思路: max(A*B,C*D); AtCoder Beginner Contest 052 B题意: 枚举过程,然后...太水了.. AtCoder Beginner Contest 052 C题意: 输出N!的因子个数mod1…

A - ABC/ARC Time limit : 2sec / Memory limit : 256MB Score : 100 points Problem Statement Smeke has decided to participate in AtCoder Beginner Contest (ABC) if his current rating is less than 1200, and participate in AtCoder Regular Contest (ARC) oth…

AtCoder Beginner Contest 136 题目链接 A - +-x 直接取\(max\)即可. Code #include <bits/stdc++.h> using namespace std; typedef long long ll; const int N = 2e5 + 5; int main() { ios::sync_with_stdio(false); cin.tie(0); int a, b; cin >> a >> b; cout &…

AtCoder Beginner Contest 137 F 数论鬼题(虽然不算特别数论) 希望你在浏览这篇题解前已经知道了费马小定理 利用用费马小定理构造函数\(g(x)=(x-i)^{P-1}\) \[x=i,g(x)=0\] \[x\ne i ,g(x)=1\] 则我们可以构造 \[f(x)=\sum^{i=0}_{P-1}(-a_i*(x-i)^{P-1}+a_i)\] 对于第\(i\)条式子当且仅当\(a_i=1 \ and \ x=i\)时取到\(1\) 代码写的比较奇怪 const…

A - Rating Goal Time limit : 2sec / Memory limit : 256MB Score : 100 points Problem Statement Takahashi is a user of a site that hosts programming contests.When a user competes in a contest, the rating of the user (not necessarily an integer) changes…

AtCoder Beginner Contest 079 D - Wall Warshall Floyd 最短路....先枚举 k #include<iostream> #include<cstdio> #include<cstring> #include<algorithm> using namespace std; ][]; int H, W, A, ans; int main() { scanf("%d%d", &H, &a…

AtCoder Beginner Contest 064 D - Insertion Problem Statement You are given a string S of length N consisting of ( and ). Your task is to insert some number of ( and ) into S to obtain a correct bracket sequence.Here, a correct bracket sequence is def…