A. You're Given a String... time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output You're given a string of lower-case Latin letters. Your task is to find the length of its longest substring that…

[Educational Codeforces Round 16]E. Generate a String 试题描述 zscoder wants to generate an input file for some programming competition problem. His input is a string consisting of n letters 'a'. He is too lazy to write a generator so he will manually ge…

D. String Game time limit per test 2 seconds memory limit per test 512 megabytes input standard input output standard output Little Nastya has a hobby, she likes to remove some letters from word, to obtain another word. But it turns out to be pretty…

题目链接: http://codeforces.com/problemset/problem/710/E E. Generate a String time limit per test 2 secondsmemory limit per test 512 megabytes 问题描述 zscoder wants to generate an input file for some programming competition problem. His input is a string co…

http://codeforces.com/contest/1092/problem/A You are given two integers nn and kk. Your task is to construct such a string ss of length nn that for each ii from 11 to kk there is at least one ii-th letter of the Latin alphabet in this string (the fir…

C. The Smallest String Concatenation 题目连接: http://www.codeforces.com/contest/632/problem/C Description You're given a list of n strings a1, a2, ..., an. You'd like to concatenate them together in some order such that the resulting string would be lex…

C. Bear and String Distance 题目连接: http://www.codeforces.com/contest/628/problem/C Description Limak is a little polar bear. He likes nice strings - strings of length n, consisting of lowercase English letters only. The distance between two letters is…

题目链接:http://codeforces.com/problemset/problem/632/C C. The Smallest String Concatenation time limit per test 3 seconds memory limit per test 256 megabytes input standard input output standard output You're given a list of n strings a1, a2, ..., an. Y…

Generate a String 题目链接: http://codeforces.com/contest/710/problem/E Description zscoder wants to generate an input file for some programming competition problem. His input is a string consisting of n letters 'a'. He is too lazy to write a generator s…

题目链接:http://codeforces.com/contest/1204/problem/D2 题目是给定一个01字符串,让你尽可能多地改变1变为0,但是要保证新的字符串,对任意的L,R使得Sl,Sl+1,Sl+2...Sr的最长不递减子序列长度保持不变,求新的串s. dp思路,从前往后遍历串s. 1 . 遇到s[ i ] = 0 是不能改变的,因为从i到n的最长不递减子序列必定是以s[ i ] = 0为起点的,改变之后会减少长度. 2 . 遇到s[ i ] = 1.我们考虑如果变为0,首…