题意:给一个元素周期表的元素符号(114种),再给一个串,问这个串能否有这些元素符号组成(全为小写). 解法1:动态规划 定义:dp[i]表示到 i 这个字符为止,能否有元素周期表里的符号构成. 则有转移方程:dp[i] = (dp[i-1]&&f(i-1,1)) || (dp[i-2]&&f(i-2,2))     f(i,k):表示从i开始填入k个字符,这k个字符在不在元素周期表中.  dp[0] = 1 代码: //109ms 0KB #include <ios…

#include<iostream> #include<string.h> #include<stdio.h> #include<ctype.h> #include<algorithm> #include<stack> #include<queue> #include<set> #include<math.h> #include<vector> #include<map> #…

题目链接 https://icpcarchive.ecs.baylor.edu/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&problem=4268 题意 给出化学元素周期表,然后给出一个字符串,判断字符串里面的字符,能不能够完全由元素周期表里面的元素构成 或者换一种说法,将字符串切割成若干个子串,能不能有一种切割的方式,使得切割下来的每一个子串都是元素周期表里面的元素 思路 其实可以发现 元素周期表里面的…

字符串处理的题目: 学习了一下string类的一些用法: 这个代码花的时间很长,其实可以更加优化: 代码: #include<iostream> #include<string> using namespace std; ]= {"he","h","li","be","b","c","n","o","f"…

要back的题目 目标是全绿!back一题删一题! acmm7 1003 1004 acmm8 1003 1004 sysu20181013 Stat Origin Title Solved A Gym 100624A Kingdoms   B Gym 100624B Who wants to live forever? Solved C Gym 100624C Chemist's vows   D Gym 100624D Non-boring sequences Attempted E Gym…

UVALive - 4108 SKYLINE Time Limit: 3000MS     64bit IO Format: %lld & %llu Submit Status uDebug Description   The skyline of Singapore as viewed from the Marina Promenade (shown on the left) is one of the iconic scenes of Singapore. Country X would a…

UVALive - 3942 Remember the Word A potentiometer, or potmeter for short, is an electronic device with a variable electric resistance. It has two terminals and some kind of control mechanism (often a dial, a wheel or a slide) with which the resistance…

UVALive - 3942 Remember the Word Neal is very curious about combinatorial problems, and now here comes a problem about words. Know- ing that Ray has a photographic memory and this may not trouble him, Neal gives it to Jiejie. Since Jiejie can’t remem…

题目传送门 /* 题意:本来有n个雕塑,等间距的分布在圆周上,现在多了m个雕塑,问一共要移动多少距离: 思维题:认为一个雕塑不动,视为坐标0,其他点向最近的点移动,四舍五入判断,比例最后乘会10000即为距离: 详细解释:http://www.cnblogs.com/zywscq/p/4268556.html */ #include <cstdio> #include <iostream> #include <algorithm> #include <cmath&…

题目链接:https://icpcarchive.ecs.baylor.edu/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&problem=4156 题目拷贝难度大我就不复制了. 题目大意:维护一个字符串,要求支持插入.删除操作,还有输出第 i 次操作后的某个子串.强制在线. 思路1:使用可持久化treap可破,详细可见CLJ的<可持久化数据结构的研究>. 思路2:rope大法好,详见:http…