CodeForces 1109F. Sasha and Algorithm of Silence's Sounds

阿新 • • 發佈：2019-02-20

個數 href sil 所有題目 mission 簡述 ref iss

題目簡述：給定一個$n \times m$的二維矩陣$a[i][j]$，其中$1 \leq nm \leq 2 \times 10^5$，矩陣元素$1 \leq a[i][j] \leq nm$且互不相等。一個區間$[l, r]$是【好】的，如果所有在$[l, r]$範圍內元素（在平面上）構成了一棵樹。求【好】區間$[l, r](1 \leq l \leq r \leq nm)$的個數。

解：code

個數 href sil 所有題目 mission 簡述 ref iss 題目簡述：給定一個$n \times m$的二維矩陣$a[i][j]$，其中$1 \leq nm \leq 2 \times 10^5$，矩陣元素$1 \leq a[i][j] \leq nm$且互不

[CF1109F]Sasha and Algorithm of Silence's Sounds

不能 pan cst 統計 swap 隨著 ios ack tin 題意有一個$n*m$的網格,每個格子有一個數,為$1$~$n * m$的排列一個區間$(1<=l<=r<=n*m)$是好的,當且僅當:數值在該區間內的格子,構成一棵樹(

Codeforces 988D Points and Powers of Two 【性質】【卡常】

cout force 大於 codeforce ces com CI ORC size 這道題關鍵在於想到兩個性質，想到就好做了。這還是我做過的第一道卡常題 1.滿足題目中條件的子集，其中元素個數不能大於3 2.如果最大子集為3的話，那一定是x-2^i, k, x+2^

codeforces CF718C Sasha and Array 線段樹維護矩陣

read ctu his memory long long ORC efi end complex $ \Rightarrow $ 戳我進CF原題 C. Underground Lab time limit per test: 1 second memory limit

Codeforces 718C. Sasha and Array（線段樹）

傳送門解題思路：這道題給了我們一個嶄新的角度來看線段樹。我們常常使用的線段樹是維護區間的函式的。這裡呢，提示我們線段樹其實還可以維護遞推。美好的矩陣遞推性質支援了這一功能。或者說，對於遞推項求和，可以使用線段樹維護矩陣。區間向前遞推可以用懶惰標記記錄遞推矩陣。區間的查詢可以是子

codeforces 718C Sasha and Array

線段樹維護矩陣資訊。。一定要把初值都賦好。。。因為矩陣具有結合律，所以可以把子矩陣相加作為上一層的矩陣，對於更新的加值x，先線上段樹外將轉移矩陣自乘x次，再新增到線段樹裡。主要是碼的準確。。 #include<cstdio> #include<cmath>

CodeForces - 305C Ivan and Powers of Two 優先佇列

Ivan has got an array of n non-negative integers a1, a2, ..., an. Ivan knows that the array is sorted in the non-decreasing order. Ivan wrote out in

CodeForces - 305C Ivan and Powers of Two（數學+思維）

CodeForces - 305C Ivan and Powers of Two（數學+思維） Ivan has got an array of n non-negative integers a1, a2, …, an. Ivan knows that the array is sor

German ex-director LTE Router of London's Victoria and Albert Museum dies aged 62

www.inhandnetworks.de London’s Victoria and Albert Museum on Monday announced its “committed Europhile” former director, Martin Roth, has died mon

Codeforces 718C Sasha and Array(線段樹維護矩陣)

線段樹上區間加和，求和時候值變成斐波那契數列下標，對斐波那契數列求和首先想到循環節，但是應該很大，所以GG 然後就是想到對於斐波那契數列啊，有矩陣遞推比如這裡是x，值就是f(x),那麼然後加a，就是f(x+a) f(x+a)和f(x)就是多成了a次系

Codeforces 439C Devu and Partitioning of the Array

比較坑一題，很多細節需要把握。奇數只能由奇數個奇陣列成，那讓奇陣列全由一個奇陣列成（除了某些情況，比如p = 0），然後就是各種細節各種判斷了。 #include <iostream> #include <cstdio> #include &l

【排序】【規律】Codeforces Round #254 (Div. 2) - D. Rooter's Song

names nes rac then represent cin loaded output same D. DZY Loves FFT Source http://codeforces.com/contest/445/problem/D Description Wh

讀書筆記 The Random Forest based Detection of Shadowsock's Traffic

base 讀書 tree 框架 mage 參數 mce ado rand 文章框架：除去introduction、related work，文章首先介紹的是背景知識。1. 為什麽很難檢測Shadowsocks？ 2. 隨機森林算法介紹（就是一種分類器，可以將流量分為兩類，

ssh無法登陸,secure日誌報錯not allowed because none of user's groups

來看 onf one init 百度 gin user not etc 背景：一臺阿裏雲ECS跑了雲市場的一個安全加固腳本，限制了root登錄和密碼登錄，由於客戶需求，需要將root放開對應操作： vim /etc/ssh/sshd_config PermitRootL

「Python」Numpy equivalent of MATLAB's cell array

design ike can acc sta sig bject b- tlab 轉自Stackoverflow。備忘用。 Question I want to create a MATLAB-like cell array in Numpy. How can I acco

Codeforces Round #385 (Div. 1) B. Hongcow's Game(bitmask)

This is an interactive problem. In the interaction section below you will see the information about flushing the output. In this problem, you will b

Ask HN: Security when taking over hosting and development of a client's site?

I and a few others at the company I work at are trying to work out a security procedure when new clients transfer their site to us. In the past we have bee

Codeforces Round #248 (Div. 1) D - Nanami's Power Plant 最小割

clas define sign fir bsp codeforce using nic second D - Nanami‘s Power Plant 思路：類似與bzoj切糕那道題的模型。。 #include<bits/stdc++.h> #def

解決mysql報錯：- Expression #1 of ORDER BY clause is not in GROUP BY clause and contains nonaggregated column 'information_schema.PROFILING.SEQ'

_for tran contains column schema mysql eat table express mysql執行報錯： - Expression #1 of ORDER BY clause is not in GROUP BY clause and cont

Arpa's weak amphitheater and Mehrdad's valuable Hoses CodeForces - 742D

next som .並查集 log line allow con stream tps Just to remind, girls in Arpa‘s land are really nice. Mehrdad wants to invite some Hose

CodeForces 1109F. Sasha and Algorithm of Silence's Sounds

相關推薦