题目链接:http://codeforces.com/problemset/problem/660/C 题意: 给你一个长度为 $n$ 的 $01$ 串 $a$,记 $f(a)$ 表示其中最长的一段连续 $1$ 的长度. 现在你最多可以将串中的 $k$ 个 $0$ 变成 $1$,求操作后的 $f(a)$. 题解: (说实话这道题不看tag我不一定能想得出来……) 首先考虑二分枚举答案,对于一个假定的 $f(a)=x$,我们需要判断能不能满足: 用 $dp[i]$ 表示 $a[i-x+1], \c…

题目链接: http://codeforces.com/problemset/problem/660/C 题意: 给定0.1组成的数组,可以改变k个0使其为1,问最终可以得到的连续的1的最大长度. 分析: 很容易想到二分答案的做法, 二分长度,然后找是否存在满足题意的区间. 还可以用尺取法,这样在O(n)时间负责度内就可以完成,但是个人感觉写起来没有二分直观.. 代码: 二分: #include<cstdio> #include<cmath> #include<iostrea…

题目大概说给一个由01组成的序列,要求最多把k个0改成1使得连续的1的个数最多,输出一种方案. 和CF 676C相似. #include<cstdio> #include<algorithm> using namespace std; ]; int main(){ int n,k; scanf("%d%d",&n,&k); ; i<n; ++i){ scanf("%d",a+i); } ){ ,cnt=;; ; i<…

维护一个左右区间指针就可以. #include<cstdio> #include<cstring> #include<iostream> #include<queue> #include<stack> using namespace std; int main(){ int n,m; ]; while(~scanf("%d%d",&n,&m)){ ;i<=n;i++) scanf("%d&quo…

题目链接: C. Hard Process time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output You are given an array a with n elements. Each element of a is either 0 or 1. Let's denote the length of the longest su…

Hard Process Time Limit:1000MS     Memory Limit:262144KB     64bit IO Format:%I64d & %I64u Submit Status Practice CodeForces 660C Description You are given an array a with n elements. Each element of a is either 0 or 1. Let's denote the length of the…

Hard Process CodeForces - 660C You are given an array a with n elements. Each element of a is either 0 or 1. Let's denote the length of the longest subsegment of consecutive elements in a, consisting of only numbers one, as f(a). You can change no mo…

C. Hard Process 题目连接: http://www.codeforces.com/contest/660/problem/C Description You are given an array a with n elements. Each element of a is either 0 or 1. Let's denote the length of the longest subsegment of consecutive elements in a, consisting…

题目链接:http://codeforces.com/problemset/problem/660/C 尺取法 #include <bits/stdc++.h> using namespace std; int main() { )]; int n, k; scanf("%d %d", &n, &k); ; i <= n; ++i) { scanf("%d", num + i); } , res = , cnt = , flagl…

题目链接: http://codeforces.com/contest/660/problem/C 题意: 将最多k个0变成1,使得连续的1的个数最大 题解: 二分连续的1的个数x.用前缀和判断区间[i,i+x-1]里面0的个数是否小于等于k. 代码: #include<iostream> #include<cstdio> #include<vector> #include<cstring> using namespace std; ; int n,k; i…

地址:http://codeforces.com/contest/660/problem/C 题目: You are given an array a with n elements. Each element of a is either 0 or 1. Let's denote the length of the longest subsegment of consecutive elements in a, consisting of only numbers one, as f(a).…

https://zh.wikipedia.org/wiki/%E8%BC%BE%E8%BD%89%E7%9B%B8%E9%99%A4%E6%B3%95 取模也是一样的,就当多减几次. 在欧几里得最初的描述中,商和余数是通过连续的减法来计算的,即从rk−2中不断减去rk−1直到小于rk−1.一个更高效的做法是使用整数除法和模除来计算商和余数: rk ≡ rk−2 mod rk−1 在欧几里得定义的减法版本,取余运算被减法替换 while (b!=0) { if (a>b) a=a-b; else…

C. Hard Process time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output You are given an array a with n elements. Each element of a is either 0 or 1. Let's denote the length of the longest subsegme…

B. Weird Subtraction Process   time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output You have two variables a and b. Consider the following sequence of actions performed with these variables: If …

E - Qwerty78 Trip Time Limit:2000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u Submit Status Practice Gym 100947E Description standard input/output Announcement   Statements Qwerty78 is a well known programmer (He is a member of the I…

B. Vanya and Food Processor 题目链接:http://codeforces.com/contest/677/problem/B Vanya smashes potato in a vertical food processor. At each moment of time the height of the potato in the processor doesn't exceed h and the processor smashes k centimeters…

1.前言 虽然这次我依旧没有参加正式比赛,但是事后还是看了看题目的...一般不怎么刷Codeforces. A.Raising Bacteria You are a lover of bacteria. You want to raise some bacteria in a box. Initially, the box is empty. Each morning, you can put any number of bacteria into the box. And each night…

题目链接:http://codeforces.com/contest/620/problem/E E. New Year Tree time limit per test 3 seconds memory limit per test 256 megabytes input standard input output standard output The New Year holidays are over, but Resha doesn't want to throw away the N…

E. Memory and Casinos 题目连接: http://codeforces.com/contest/712/problem/E Description There are n casinos lined in a row. If Memory plays at casino i, he has probability pi to win and move to the casino on the right (i + 1) or exit the row (if i = n),…

C. Anton and Making Potions 题目连接: http://codeforces.com/contest/734/problem/C Description Anton is playing a very interesting computer game, but now he is stuck at one of the levels. To pass to the next level he has to prepare n potions. Anton has a…

传送门 D. Restructuring Company time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Even the most successful company can go through a crisis period when you have to make a hard decision — to rest…

题目链接:http://codeforces.com/problemset/problem/705/B 题意略解: 两个人玩游戏,解数字,一个数字可以被分成两个不同或相同的数字 (3可以解成 1 2),最小1不能再解 示例1: 第一把 当前1号玩家开始解数字 1,不能解, 则2号赢 输出2 第二把 当前数字为 1 2, 1号玩家直接对 2 进行解 解成 1 1,数字为 1 1 1,2号玩家无解,1号赢 第三把 当前数字为 1 2 3,一号玩家先对 2 解,解成 1 1,数字为 1 1 1 3,2…

[codeforces 528]A. Glass Carving 试题描述 Leonid wants to become a glass carver (the person who creates beautiful artworks by cutting the glass). He already has a rectangular wmm  ×  h mm sheet of glass, a diamond glass cutter and lots of enthusiasm. Wha…

Unusual Product Time Limit: 1000MS   Memory Limit: 262144KB   64bit IO Format: %I64d & %I64u Submit Status Description Little Chris is a huge fan of linear algebra. This time he has been given a homework about the unusual square of a square matrix. T…

C. Replacement Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/570/problem/C Description Daniel has a string s, consisting of lowercase English letters and period signs (characters '.'). Let's define the operation of replac…

Mr. Kitayuta's Colorful Graph Time Limit:1000MS     Memory Limit:262144KB     64bit IO Format:%I64d & %I64u Submit Status Practice CodeForces 505B Description Mr. Kitayuta has just bought an undirected graph consisting of n vertices and m edges. The…

Error Correct System Time Limit:2000MS     Memory Limit:262144KB     64bit IO Format:%I64d & %I64u Submit Status Practice CodeForces 527B Description Ford Prefect got a job as a web developer for a small company that makes towels. His current work ta…

题目链接: http://codeforces.com/contest/703/problem/D D. Mishka and Interesting sum time limit per test 3.5 secondsmemory limit per test 256 megabytes 问题描述 Little Mishka enjoys programming. Since her birthday has just passed, her friends decided to prese…

题目链接: http://codeforces.com/contest/103/problem/D D. Time to Raid Cowavans time limit per test:4 secondsmemory limit per test:70 megabytes 问题描述 As you know, the most intelligent beings on the Earth are, of course, cows. This conclusion was reached lo…

题目链接: http://codeforces.com/problemset/problem/268/E E. Playlist time limit per test 1 secondmemory limit per test 256 megabytes 问题描述 Manao's friends often send him new songs. He never listens to them right away. Instead, he compiles them into a play…