Lucky String -- 微软笔试 标签(空格分隔): 算法 A string s is LUCKY if and only if the number of different characters in s is a fibonacci number. Given a string consisting of only lower case letters , output all its lucky non-empty substrings in lexicographical or…

Lucky Ticket Time Limit:2000MS     Memory Limit:262144KB     64bit IO Format:%I64d & %I64u Submit Status Practice CodeForces 146A Description Petya loves lucky numbers very much. Everybody knows that lucky numbers are positive integers whose decimal…

Lucky Sum Time Limit: 2000ms Memory Limit: 262144KB This problem will be judged on CodeForces. Original ID: 121A64-bit integer IO format: %I64d      Java class name: (Any)     Petya loves lucky numbers. Everybody knows that lucky numbers are positive…

C. Lucky Numbers time limit per test 0.5 seconds memory limit per test 64 megabytes input standard input output standard output The numbers of all offices in the new building of the Tax Office of IT City will have lucky numbers. Lucky number is a num…

E. Lucky Queries time limit per test 3 seconds memory limit per test 256 megabytes input standard input output standard output Petya loves lucky numbers very much. Everybody knows that lucky numbers are positive integers whose decimal record contains…

题意: 一个数只含有4,7就是lucky数...现在有一串长度为n的数...问这列数有多少个长度为k子串..这些子串不含两个相同的lucky数... 子串的定义..是从这列数中选出的数..只要序号不同..就不不同的串..如 1 1 的长度为1的子串有两个 题解: 解题前可以先求一下1000000000内有多少个数是lucky的...可以递推的求..也可以暴力求~~可以看出最多1022个lucky数..很少... 现将这堆数的所有lucky数找出来...把相同的放在一个lucky数里计数... d…

题目链接:http://codeforces.com/problemset/problem/797/C 题意: 给你一个非空字符串s,空字符串t和u.有两种操作:(1)把s的首字符取出并添加到t的末尾.(2)把t的尾字符取出并添加到u的末尾. 问你当经过一系列操作后,s和t均为空时,字典序最小的u. 题解: 操作的本质: s为队列,t为栈. 贪心思路: (1)找到s中的最小字符c,不断出队并加入t,直至有一次出队的字符等于c,停止出队. (2)当t的尾字符小于等于s中的最小字符时,优先弹出t的尾…

A string s is LUCKY if and only if the number of different characters in s is a fibonacci number. Given a string consisting of only lower case letters , output all its lucky non-empty substrings in lexicographical order. Same substrings should be pri…

Grigory loves strings. Recently he found a metal strip on a loft. The strip had length n and consisted of letters "V" and "K". Unfortunately, rust has eaten some of the letters so that it's now impossible to understand which letter was…

C. Minimal string 题目链接:http://codeforces.com/problemset/problem/797/C time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Petya recieved a gift of a string s with length up to 105 characters fo…