Boring count Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 932    Accepted Submission(s): 382 Problem Description You are given a string S consisting of lowercase letters, and your task is cou…

题目链接 emmmm...思路是群里群巨聊天讲这题是用尺取法.....emmm然后就没难度了,不过时间上3000多,有点.....盗了个低配本的读入挂发现就降到2800左右, 翻了下,发现神犇Claris280MS秒过.......%%% #include <stdio.h> #include <stdlib.h> #include <cmath> #include <string.h> #include <iostream> #include…

Jessica's Reading Problem Description Jessica's a very lovely girl wooed by lots of boys. Recently she has a problem. The final exam is coming, yet she has spent little time on it. If she wants to pass it, she has to master all ideas included in a ve…

题意:给一个数列,按如下公式求和. 分析:场上做的时候,傻傻以为是线段树,也没想出题者为啥出log2,就是S(i,j) 的二进制表示的位数.只能说我做题依旧太死板,让求和就按规矩求和,多考虑一下就能发现这个题目应该是另想办法解决的,类似于改代码的题目,直接告诉你C++代码,让你从TLE改成AC,其实真正让你改的是算法,全身都要变. 看了题解,终于明白这道题目的正解算法: 因为S(i,j)的位数在一定范围内是一样的,所以我们可以枚举位数1~35(顶多是2^34),怎么计算(i+j)?继续枚举起点k…

[题目大意] 给出一个整数列,求一段子序列之和最接近所给出的t.输出该段子序列之和及左右端点. [思路] ……前缀和比较神奇的想法.一般来说,我们必须要保证数列单调性,才能使用尺取法. 预处理出前i个数的前缀和,和编号i一起放入pair中,然而根据前缀和大小进行排序.由于abs(sum[i]-sum[j])=abs(sum[j]-sum[i]),可以忽视数列前缀和的前后关系.此时,sum[r]-sum[l]有单调性. 因此我们可以先比较当前sum[r]-sum[l]与t的差,并更新答案. 如果当…

Description Signals of most probably extra-terrestrial origin have been received and digitalized by The Aeronautic and Space Administration (that must be going through a defiant phase: "But I want to use feet, not meters!"). Each signal seems to…

Sum of Consecutive Prime Numbers Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 22876   Accepted: 12509 Description Some positive integers can be represented by a sum of one or more consecutive prime numbers. How many such representatio…

中位数计数 Time Limit: 12000/6000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 909    Accepted Submission(s): 346 Problem Description 中位数定义为所有值从小到大排序后排在正中间的那个数,如果值有偶数个,通常取最中间的两个数值的平均数作为中位数. 现在有n个数,每个数都是独一无二的,求出每个数在多少个包…

C. They Are Everywhere time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Sergei B., the young coach of Pokemons, has found the big house which consists of n flats ordered in a row from left…

C. They Are Everywhere time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Sergei B., the young coach of Pokemons, has found the big house which consists of n flats ordered in a row from left…