这次真的好难...... 我这个绿名蒟蒻真的要崩溃了555... 我第二题就不会写...... 暴力搜索MLE得飞起. 好像用到最短路?然而我并没有学过,看来这个知识点又要学. 后面的题目赛中都没看,今天早上看了一下D发现还是能写的. A.You Are Given Two Binary Strings... 简单来说,对f(y)乘以2的k次,实际上就是把这个串左移k位.要使反转的串的字典序最小,就要让f(y)最后的1与f(x)的最后的1的位置对齐. #include<bits/stdc++.h…

题目链接:https://codeforc.es/contest/1202/problem/D 题意: 给你一个数 n ( <=1e9 ),让你构造137713713.....(只含有1,3,7)的字符串使不同1337的子序列个数为n,而构造出来的字符串不能很长( <= 1e5). 思路: 这类构造题肯定是要先固定一种方式,我尝试了以 C(2,a)+C(2,b)+C(2,c)+... = n 的形式,发现不行.后来还是看了别人的代码, 是以 : 所以总长度不会大于 (这是m的最大长度) 刚好是…

题目链接:https://codeforc.es/contest/1202/problem/B 题意: 给你一串数,问你插入最少多少数可以使x-y型机器(每次+x或+y的机器,机器每次只取最低位--%10)产生这个子序列. 解: 这题真的是...唉我真的,还是怪自己太弱吧,比如08888,8和前一个8相同的话你必须让机器输入东西(不能看着这串数反正都是一样就不输入). 就是预处理x-y型每次加(0~9)最少需要多少次就行了,刚上蓝就rank1900+,以后多多磨练吧. #define IOS i…

比赛链接:https://codeforc.es/contest/1202 A. You Are Given Two Binary Strings... 题意:给出两个二进制数\(f(x)\)和\(f(y)\),定义一个二进制数\(s_k=f(x)+2^k\cdot f(y)\),询问\(k\)取何值时\(s_k\)的反向字符串(将二进制数看作01串)字典序最小. 分析:首先,我们需要知道对于一个二进制数乘2,相当于将该数整体左移一位,因此我们只需要找到\(f(y)\)最右侧的1的位置\(pos…

Problem   Educational Codeforces Round 60 (Rated for Div. 2) - C. Magic Ship Time Limit: 2000 mSec Problem Description Input Output The only line should contain the minimal number of days required for the ship to reach the point (x2,y2)(x2,y2). If it…

Problem   Educational Codeforces Round 60 (Rated for Div. 2) - D. Magic Gems Time Limit: 3000 mSec Problem Description Input The input contains a single line consisting of 2 integers N and M (1≤N≤10^18, 2≤M≤100). Output Print one integer, the total n…

Educational Codeforces Round 43 (Rated for Div. 2) https://codeforces.com/contest/976 A #include<bits/stdc++.h> using namespace std; #define lson l,mid,rt<<1 #define rson mid+1,r,rt<<1|1 #define IT set<ll>::iterator #define sqr(x)…

Educational Codeforces Round 35 (Rated for Div. 2) https://codeforces.com/contest/911 A 模拟 #include<bits/stdc++.h> using namespace std; #define lson l,mid,rt<<1 #define rson mid+1,r,rt<<1|1 #define IT set<ll>::iterator #define sqr(…

Codeforces Educational Codeforces Round 44 (Rated for Div. 2) F. Isomorphic Strings 题目连接: http://codeforces.com/contest/985/problem/F Description You are given a string s of length n consisting of lowercase English letters. For two given strings s an…

Codeforces Educational Codeforces Round 44 (Rated for Div. 2) E. Pencils and Boxes 题目连接: http://codeforces.com/contest/985/problem/E Description Mishka received a gift of multicolored pencils for his birthday! Unfortunately he lives in a monochrome w…