http://codeforces.com/problemset/problem/150/B 题意: 给出n,m,k,n表示字符串的长度为n,m表示字符种类个数,k表示每k个数都必须是回文串,求满足要求的不同字符串有多少种. 思路:分奇偶推一下,当k为偶数时,容易发现如果n=k,那么有最多有k/2种不同的字符可填,如果n>k,你会发现此时所有位置都必须一样. 奇数的话会稍微麻烦一点,如果n=k,那么最多有k/2+1种不同的字符可填,如果n>k,你会发现此时最后只有2中不同的字符可填. #inc…

题目传送门 /* 构造:结构体排个序,写的有些啰嗦,主要想用用流,少些了判断条件WA好几次:( */ #include <cstdio> #include <algorithm> #include <cstring> #include <cmath> #include <vector> #include <map> #include <iostream> #include <string> using name…

题目传送门 /* 题意:一个字符串分割成k段,每段开头字母不相同 水题:记录每个字母出现的次数,每一次分割把首字母的次数降为0,最后一段直接全部输出 */ #include <cstdio> #include <iostream> #include <cstring> #include <string> #include <algorithm> using namespace std; ; const int INF = 0x3f3f3f3f;…

D题 并查集+组合 #include <iostream> #include <cstdio> #include <cstring> using namespace std; #define MOD 1000000007 ]; int find(int x) { int t,r; t = x; while(x != o[x]) x = o[x]; while(x != t) { r = o[t]; o[t] = x; t = r; } return x; } void…

Soft Drinking time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output This winter is so cold in Nvodsk! A group of n friends decided to buy k bottles of a soft drink called "Take-It-Light" to…

E. Wilbur and Strings Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/596/problem/E Description Wilbur the pig now wants to play with strings. He has found an n by m table consisting only of the digits from 0 to 9 where the…

D - DZY Loves Strings 思路:感觉这种把询问按大小分成两类解决的问题都很不好想.. https://codeforces.com/blog/entry/12959 题解说得很清楚啦. #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 pai…

E. Dreamoon and Strings 题目连接: http://www.codeforces.com/contest/476/problem/E Description Dreamoon has a string s and a pattern string p. He first removes exactly x characters from s obtaining string s' as a result. Then he calculates that is defined…

题目链接:http://www.codeforces.com/problemset/problem/281/A题意:将一个英文字母的首字母变成大写,然后输出.C++代码: #include <cstdio> #include <cstring> ]; void solve(char *s) { if (*s >= 'a' && *s <= 'z') *s -= ; while (*s) { putchar(*s); s ++; } } int main(…

D. Alyona and Strings 题目连接: http://www.codeforces.com/contest/682/problem/D Description After returned from forest, Alyona started reading a book. She noticed strings s and t, lengths of which are n and m respectively. As usual, reading bored Alyona…