A. Salem and Sticks time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Salem gave you nn sticks with integer positive lengths a1,a2,…,ana1,a2,…,an. For every stick, you can change its length t…

链接:https://codeforces.com/contest/1105/problem/A 题意: 给n个数,找到一个数t使i(1-n)∑|ai-t| 最小. ai-t 差距1 以内都满足 思路: 暴力,枚举. 代码: #include <bits/stdc++.h> using namespace std; typedef long long LL; const int MAXN = 1000+5; int a[MAXN]; int main() { int n; scanf(&quo…

#include <bits/stdc++.h> using namespace std; int main() { int n;cin>>n; int a[n];for(int &i:a) cin>>i; int ans_ave=0,ans_cost=INT_MAX; for(int i=1;i<=100;i++){ int ave=i,cost=0; for(int j:a){ if(j<i) cost+=i-1-j; else if(j>…

link orz olinr AK Codeforces Round #533 (Div. 2) 中文水平和英文水平都太渣..翻译不准确见谅 T1.给定n<=1000个整数,你需要钦定一个值t,使得每个整数到线段[t-1,t+1]距离和最小,求最小距离,每个数<=100 枚举t #include <cstdio> using namespace std; int n, a[1010]; int main() { scanf("%d", &n); for…

Codeforces Round #297 (Div. 2)C. Ilya and Sticks Time Limit: 2 Sec  Memory Limit: 256 MBSubmit: xxx  Solved: 2xx 题目连接 http://codeforces.com/contest/525/problem/C Description In the evening, after the contest Ilya was bored, and he really felt like ma…

题目传送门 /* 题意:给n个棍子,组成的矩形面积和最大,每根棍子可以-1 贪心:排序后,相邻的进行比较,若可以读入x[p++],然后两两相乘相加就可以了 */ #include <cstdio> #include <algorithm> #include <cstring> #include <cmath> using namespace std; typedef long long ll; ; const int INF = 0x3f3f3f3f; in…

Codeforces Round #297 (Div. 2)D. Arthur and Walls Time Limit: 2 Sec  Memory Limit: 512 MBSubmit: xxx  Solved: 2xx 题目连接 http://codeforces.com/contest/525/problem/D Description Finally it is a day when Arthur has enough money for buying an apartment. H…

A. Salem and Sticks 签. #include <bits/stdc++.h> using namespace std; #define N 1010 int n, a[N]; int work(int x) { ; ; i <= n; ++i) res += max(, abs(x - a[i]) - ); return res; } int main() { while (scanf("%d", &n) != EOF) { ; i <…

A. Salem and Sticks 题目描述 Salem gave you n n n sticks with integer positive lengths a1,a2,…,an a_1, a_2, \ldots, a_n a1​,a2​,…,an​ . For every stick, you can change its length to any other positive integer length (that is, either shrink or stretch it)…

题目链接:https://codeforces.com/contest/1105 C. Ayoub and Lost Array 题目大意:一个长度为n的数组,数组的元素都在[L,R]之间,并且数组全部元素的和可以被3整除,问有多少种方法构建出该数组.答案模1000000007 例 输入 2 1 3 输出 3 note:满足的情况只有[1,2],[2,1],[3,3] 解题思路:用dp[i][j]表示长度为i的数组,元素大小在[L,R]之间,并且元素和模3的余数为j的方案数,我们可以计算出[L,…

传送门:http://codeforces.com/contest/1105/problem/C C. Ayoub and Lost Array time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Ayoub had an array aa of integers of size nn and this array had two…

传送门:http://codeforces.com/contest/1105/problem/B B. Zuhair and Strings time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Given a string ss of length nn and integer kk (1≤k≤n1≤k≤n). The string…

链接:https://codeforces.com/contest/1105/problem/C 题意: 给n,l,r. 一个n长的数组每个位置可以填区间l-r的值. 有多少种填法,使得数组每个位置相加的和是3的倍数 思路: 赛后看代码都看不懂的题. dp, 从1个数组扩展到n个数组, dp[i][j]是加上第i个数组后,分别余0,1,2的个数. 余0则是,i-1余0*自己余0+(i-1余1*自己余2)+(i-1余2*自己余1) 剩下同理 代码: #include <bits/stdc++.h>…

链接:https://codeforces.com/contest/1105/problem/D 题意: 给n*m的地图,最多9个人,同时有每个人的扩张次数(我开始以为是直线扩张最大长度..实际是能连续扩张次数.) 地图上有‘#’,‘.',和数字,数字对应每个人的据点, 从1-n轮流扩张. 地图被扩张完后,输入每个人的据点数目. 思路: 赛后写的题.还一堆bug, 用队列和一个数组,记录每个人能扩张的点和下一次能扩张的个数. 然后就是一堆循环套着.每次入队更新下一次的扩张个数,同时用flag记录…

链接:https://codeforces.com/contest/1105/problem/B 题意: 给一个字符串和k,连续k个相同的字符,可使等级x加1, 例:8 2 aaacaabb 则有aa aa 即x=2. 求最大的k 思路: 第一眼想的是诶个查找,但是绝对会T,就没做,过一个小时才想到可以直接遍历,记录每个字符对应的最大x即可. 代码: #include <bits/stdc++.h> using namespace std; const int MAXN = 200000+10…

题目链接:https://codeforces.com/contest/1105/problem/E 题意:有 n 个事件,op = 1 表示我可以修改昵称,op = 2 表示一个名为 s_i 的朋友查询我当前的名字.一个朋友是高兴的当且仅当他每次查询我的名字都为 s_i,保证每个朋友至少查询一次我的名字,问最多可以有多少个朋友高兴. 题解:在我两次修改昵称之间,若出现不同的朋友,则他们是互斥的,可以在他们之间连一条边,然后求图的最大独立集,而原图的最大独立集等于补图的最大团,所以求补图的最大团…

题目链接:https://codeforces.com/contest/1105/problem/D 题意:p 个人在 n * m 的地图上扩展自己的城堡范围,每次最多走 a_i 步(曼哈顿距离),按 1 ~ p 的顺序,问最后每个人占领的点的数量. 题解:用一个队列维护当前起点,用另一个队列模拟当前起点走 a_i 步可以到达的全部点.(60 ~ 63行关键代码,多源bfs,不可分开跑) 数据: 4 3 2 2 1 1.. 1.. ..2 ... output:10 2 #include <bi…

E - Helping Hiasat 裸的最大团,写了一种 2 ^ (m / 2)  * (m / 2)的复杂度的壮压, 应该还有更好的方法. #include<bits/stdc++.h> #define LL long long #define fi first #define se second #define mk make_pair #define PLL pair<LL, LL> #define PLI pair<LL, int> #define PII p…

C: 题意: 有n个整数ai,数列a有两个神奇的性质.1.所有的整数都在[l,r]范围内.2.这n个数的和能被3整除.现在给出l和r,和个数n,问你有多少种方法构造出数列a,方案数mod1e9+7. 题解: 一个数被3除只有三种可能.1.整除,2.余1,2.余2. 然后我们再想这个问题,[l,r]区间内,能被3整除的数有多少?a0=r/3-l/3.余1/2的数有多少?a1/2=((r-l+1)-a0)/2.(这里具体余1和余2不重要,想想为什么) 我们设f[i][j]为前i个数,和除3余j的方案…

知识点 最大独立集(set) = 补图的最大团(clique ) 最小顶点覆盖 + 最大独立集 = V E. Helping Hiasat time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Hiasat registered a new account in NeckoForces and when his friends fo…

题意: 长为 n,由 l ~ r 中的数组成,其和模 3 为 0 的数组数目. 思路: dp[ i ][ j ] 为长为 i,模 3 为 j 的数组数目. #include <bits/stdc++.h> using namespace std; const int M=220000; const int mod=1e9+7; long long dp[M][3]; int main() { int n,l,r;cin>>n>>l>>r; for(int i…

#include <bits/stdc++.h> using namespace std; int main() { int n,k;cin>>n>>k; string s;cin>>s; int ans[26]={0}; for(int i=0;i<n;i++){ int len=1; while(len<k&&s[i+1]==s[i]) ++len,++i; if(len==k) ++ans[s[i]-'a']; } cout…

 B. Mike and Fun Time Limit: 20 Sec  Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/548/problem/A Description Mike and some bears are playing a game just for fun. Mike is the judge. All bears except Mike are standing in an n × m grid, there'…

C. Divisibility by Eight Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/550/problem/C Description You are given a non-negative integer n, its decimal representation consists of at most 100 digits and doesn't contain leadin…

A. Borya and Hanabi Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/442/problem/A Description Have you ever played Hanabi? If not, then you've got to try it out! This problem deals with a simplified version of the game. Ove…

B. Equivalent Strings Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/559/problem/B Description Today on a lecture about strings Gerald learned a new definition of string equivalency. Two strings a and b of equal length are…

C. Amr and Chemistry Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/558/problem/C Description Amr loves Chemistry, and specially doing experiments. He is preparing for a new interesting experiment. Amr has n different type…

A. Vanya and Table Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/552/problem/A Description Vanya has a table consisting of 100 rows, each row contains 100 cells. The rows are numbered by integers from 1 to 100 from bottom…

A. Fight the Monster Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/487/problem/A Description A monster is attacking the Cyberland! Master Yang, a braver, is going to beat the monster. Yang and the monster each have 3 attr…

C. Edo and Magnets Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/594/problem/C Description Edo has got a collection of n refrigerator magnets! He decided to buy a refrigerator and hang the magnets on the door. The shop ca…