Largest Substring Between Two Equal Characters - Leetcode 1624 - Python

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0:00 - Read the problem
0:12 - Drawing Explanation
4:43 - Coding Explanation

leetcode 1624

#neetcode #leetcode #python

NeetCodeIO

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Just finished this question by myself then hopped on YouTube and saw that you posted the solution to it. It was an easy question but really glad I was able to conceptualize the problem and figure out a solution similar to yours within 5 minutes. Your tutorials has elevated my problem solving skills better than any professor I've ever had. Thank you.

KevHnh

Good way to end the year with a leetcode daily problem ! Happy New Year NeetCode aka Navdeep !!!

VidyaBhandary

2:47
"we need to know at what index did we C the C"
NeetQuote 😁

omaryahia

5:32 Another benefit to using `enumerate` over `range` is that you don't have to worry about remembering whether to subtract 1 or not, since enumerate just enumerates over every element.

hamirmahal

Leet code time consuming data is still confusing. Sometimes it's less and other times it's more for the same code.

Do you have a big O notation video to understand this ?
Thanks!

yashsolanki

Why don’t we just a two pointer helper method ?

def first_and_last(s, ch):
l = 0
r = len(s)-1

while l <= r:

if s[l] == s[r]:
return (r-l)-1

if s[l] != ch:
l += 1
if s[r] != ch:
r -= 1

Now call the above method for the string and all the distinct characters

char_set = set()

best_len = -1

for i in s:
char_set.add(i)

for ch in char_set:
tmp = first_and_last(s, ch)
best_len = max(best_len, tmp)

return best_len

sach

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