比赛链接:https://atcoder.jp/contests/abc179/tasks A - Plural Form 题意 给出一个由小写字母组成的单词,如果单词以 $s$ 结尾,在单词的末尾加上 $es$,否则在单词的末尾加上 $s$ . 代码 #include <bits/stdc++.h> using namespace std; int main() { ios::sync_with_stdio(false); cin.tie(nullptr); string s; cin &g…

题意:\(f(x,m)\)表示\(x\ mod\ m\),\(A_{1}=1\),而\(A_{n+1}=f(A^{2}_{n},M)\),求\(\sum^{n}_{i=1}A_{i}\). 题解:多算几个,会有一个循环节,直接模拟就好了. 代码: ll n,x,m; ll mp[N]; vector<ll> a; int main() { //ios::sync_with_stdio(false);cin.tie(0);cout.tie(0); scanf("%lld %lld %l…

题意:给你一个数字\(n\)和\(k\)个区间,\(S\)表示所有区间的并的集合,你目前在\(1\),每次可以从集合中选择一个数字向右移动,问有多少种方法从\(1\)走到\(n\). 题解:我们从1开始遍历,\(dp[i]\)表示走到目前走到\(i\)的方案数,再去遍历每一个集合,用\(dp[i]\)更新所有\([i+l[j],i+r[j]]\)中的点,而遍历区间我们可以用差分来\(O(n)\)的运行出来. 代码: int n,k; int l[N],r[N]; ll dp[N]; int ma…

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…