Leetcode Weekly Contest 399 | Video Solutions - A to D | by Raghav Goel | TLE Eliminators

Here are the video solutions for problems A, B, C, D of Leetcode Weekly Contest 399. We hope this will be useful for you in up-solving this contest.
📢Check out handpicked problems by Priyansh himself, on our CP-31 sheet: www.tle-eliminators.com/cp-sheet
Solution Codes:
Problem A : leetcode.com/submissions/deta...
Problem B : leetcode.com/submissions/deta...
Problem C : leetcode.com/submissions/deta...
Problem D : leetcode.com/submissions/deta...
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Timestamps:-
0:00 Problem A
3:33 Problem B
18:05 Problem C
53:45 Problem D

[@TLE_Eliminators]

Please fill the feedback form : forms.gle/kwLTcX4Hv6jc6Xkv9

[@shrinidhi14]

Sir, In Code of Problem 3, why had you initialized the global arrays to value 0 ? (because global variables are automatically initialized to 0)

[@vaalarivan_p]

Not only global variables, but local variables r also initialised by default to 0 in CPP. Even though i know this, i tend to initialise them to 0 anyways since i didn't know this concept initially😢

[@shrinidhi14]

@@vaalarivan_p Also, when I didn't initialized the global arrays, on running they were having some random values. Don't know why 🤷‍♂️

[@shrinidhi14]

@@vaalarivan_p Please explain how and why local variables are initialized to 0 ?

[@vaalarivan_p]

@@shrinidhi14 oops turns out i was rong abt static variables havin defolt values! my claim was based on the observation that vectors get default values even on local scope! btw idk why u didnt get default values as 0 for global arrays though!

[@MohanKarthik-lr4lk]

Sir in the second problem why did u concatenation of with 0 in second problem

[@kaushalpadaliya529]

because if you only push 5 as character it will converted to it's ascii num instead of 5 so here we took 0 as char so the freq + '0' will be the frequency of given character

[@MohanKarthik-lr4lk]

​@@kaushalpadaliya529 if u concatenate 5+words it comes why again 0 i didn't get it

[@kaushalpadaliya529]

@@MohanKarthik-lr4lk i didn't understood what you are saying can you tell me more precisely?

[@MohanKarthik-lr4lk]

@@kaushalpadaliya529 bro small question why should u concatenate with 0 that is why can't you add direct num

[@--Sreekarsai]

@@MohanKarthik-lr4lk number 0 is different from character 0. To convert any number to its character version of it we need to add character 0 to it. For example if you need to convert number 5 to character 5 you need to add 5+'0'. It will make sense when you know about ascii. for every character in keyboard you have ascii ,by using ascii number computer will decide the character. The ascii value of number 0 is 48. so if you give 48 to the computer ,computer will treat it as 0. the ascii value of 1 is 49 so if you want give 1 to computer you can give 49 or you can give '0' +1.

[@amansinghal2431]

In python, I wrote a solution with 10^6 log (10^6) complexity, it is giving TLE for even small n1 and n2

[@kaushalpadaliya529]

because python is comparatively slower than cpp java that's why ig