Everything about C++ STL MAPS - Part 1 | Competitive Programming Course | Episode 25

C++ STL TUTORIALS : • C++ STL | Competitive ...
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This video is part 1 of C++ STL MAPS. In part 1, I discuss in detail about maps, their functions, how to use them and this video due to time restriction I only discuss normal maps and next part I will discuss Unordered maps and a basic Introduction to Multimaps as well.
Practice Questions:
Note: Its hard to find practice questions particularly for STL as they are generally used with other concepts involved hence not providing a lot of them in STL videos. Below are some questions for practice:
practice.geeksforgeeks.org/pr...
codeforces.com/problemset/pro...
codeforces.com/problemset/pro...
www.hackerrank.com/challenges...
www.geeksforgeeks.org/tag/cpp...
Timestamps:
Basics of Map : (0:00)
Basic code of Map : (3:44)
Find And Erase : (11:59)
Time complexity dependency on keys: (16:45)
Question on Map : (19:10)
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#maps #unordered #stl #tutorial #competitivecoding

[@iamluv]

Hi everyone there is a little correction at 11:40, I said that loop is O(NLogN) but it O(N).
Explanation : Accessing values through iterator is a O(1) operation as iterator has address of the value and access value at some address if you know the address is a unit time operation. Now when we traverse the map, we start from m.begin() and are doing it++ in each step, it++ is also O(1) , so whole map traversal is O(1) only. at 11:40 we are not using iterators but internally that only is happening, pr is the value at address pointer by iterator, internally range based loops is also iterating through maps using iterators and then providing us reference to to the value at that address.
But when you want to directly access some specific value in map using m[key] or m.find(key), these are log(n) operations as log(n)time is taken by map to search this key.

[@vk6297]

but bhiya as you explained in the previous video, here 'pr' will identify its datatype througn 'm' as .Then how come 'pr' becomes an iterator?
(or) are you saying it as iterator because you used 'pr' as reference ?
(or) are you saying the variable in range based loops is always an iterator?
please explain bhiya.
thank u :-)

[@iamluv]

@@vk6297 variable in range based loops is always the value, neither a pointer nor an iterator

[@pranavsharma7479]

one correction for n elements map traversal will be O(n) as stated by you in first line but in the explanation you wrote ,so whole map traversal is O(1) only

[@harsh.sharma]

Got ya point bhaiya 👍

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[@AgnivaBanerjee6]

Things learnt.
//Everything about C++ STL MAPS - Part 1 | Competitive Programming Course | Episode 25
#include
using namespace std;
#define pb push_back
#define f first
#define s second
#define REP(i, a, b) for (int i=a; i

[@prateeksaini8553]

Thnx bro

[@citrus5127]

how m[s]++ increases count of second

[@xd9050]

@@citrus5127 its just increment(increases by 1) the value of respective string

[@citrus5127]

@@xd9050 it is but how when we don't give m[s] then empty string

[@himanibisht9300]

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from🇧🇩

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[@iamluv]

STL series is part of the full competitive series, link to full playlist is in description.

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please add more videos releated to compatative programming .

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whata amazing transition in the end

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[@ANUJKUMAR-wc9dz]

for earse funciton if we passing the iterator than time complexity of earser function is going to be O(1)

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