Description Recently in school Alina has learned what are the persistent data structures: they are data structures that always preserves the previous version of itself and access to it when it is modified. After reaching home Alina decided to invent…

题目链接: D. Persistent Bookcase time limit per test 2 seconds memory limit per test 512 megabytes input standard input output standard output Recently in school Alina has learned what are the persistent data structures: they are data structures that alw…

time limit per test2 seconds memory limit per test512 megabytes inputstandard input outputstandard output Recently in school Alina has learned what are the persistent data structures: they are data structures that always preserves the previous versio…

题目链接 可以发现 十进制4 对应 二进制100 十进制16 对应 二进制10000 十进制64 对应 二进制1000000 可以发现每多两个零,4的次幂就增加1. 用string读入题目给定的二进制数字,求出其长len,当len为奇数时,第一位为1,后面的位数如果都为0,则输出len,如果有一个不为0,则输出len+1: 当len为偶数时,则输出len.(之所以这样输出是因为题目给定4的次幂是从0开始的) #include<iostream> #include<string> #…

题目链接: http://codeforces.com/problemset/problem/707/D 题目大意: 一个N*M的书架,支持4种操作 1.把(x,y)变为有书. 2.把(x,y)变为没书. 3.把x行上的所有书状态改变,有变没,没变有. 4.回到第K个操作时的状态. 求每一次操作后书架上总共多少书. 题目思路: [离线][深搜][树] 现场有思路不过没敢写哈.还是太弱了. 总共只用保存一张图,把操作看成一棵树,一开始I操作连接在I-1操作后,如果遇到操作4的话,把I操作与I-1操…

time limit per test2 seconds memory limit per test256 megabytes inputstandard input outputstandard output You are given n numbers a1, a2, -, an. You can perform at most k operations. For each operation you can multiply one of the numbers by x. We wan…

time limit per test2 seconds memory limit per test256 megabytes inputstandard input outputstandard output Mr. Funt now lives in a country with a very specific tax laws. The total income of mr. Funt during this year is equal to n (n ≥ 2) burles and th…

time limit per test1 second memory limit per test256 megabytes inputstandard input outputstandard output Polycarp is mad about coding, that is why he writes Sveta encoded messages. He calls the median letter in a word the letter which is in the middl…

time limit per test1 second memory limit per test256 megabytes inputstandard input outputstandard output Innokentiy likes tea very much and today he wants to drink exactly n cups of tea. He would be happy to drink more but he had exactly n tea bags,…

time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output People do many crazy things to stand out in a crowd. Some of them dance, some learn by heart rules of Russian language, some try to become a…