DSA — Strings

1 Sum of array elements Easy 2 Find maximum in array Easy 3 Reverse an array in-place Medium 4 Count occurrences of element Easy 5 Second largest element Medium 6 Valid palindrome "leetcode" #1 Easy 7 Longest substring without repeat #2 Medium 8 Anagram check #3 Easy 9 Valid palindrome "interview" #4 Easy 10 Longest substring without repeat #5 Medium 11 Anagram check #6 Easy 12 Valid palindrome "toolliyo" #7 Easy 13 Longest substring without repeat #8 Medium 14 Anagram check #9 Easy 15 Valid palindrome "neetcode" #10 Easy 16 Longest substring without repeat #11 Medium 17 Anagram check #12 Easy 18 Valid palindrome "leetcode" #13 Easy 19 Longest substring without repeat #14 Medium 20 Anagram check #15 Easy 21 Valid palindrome "interview" #16 Easy 22 Longest substring without repeat #17 Medium 23 Anagram check #18 Easy 24 Valid palindrome "toolliyo" #19 Easy 25 Longest substring without repeat #20 Medium 26 Anagram check #21 Easy 27 Valid palindrome "neetcode" #22 Easy 28 Longest substring without repeat #23 Medium 29 Anagram check #24 Easy 30 Valid palindrome "leetcode" #25 Easy 31 Longest substring without repeat #26 Medium 32 Anagram check #27 Easy 33 Valid palindrome "interview" #28 Easy 34 Longest substring without repeat #29 Medium 35 Anagram check #30 Easy 36 Valid palindrome "toolliyo" #31 Easy 37 Longest substring without repeat #32 Medium 38 Anagram check #33 Easy 39 Valid palindrome "neetcode" #34 Easy 40 Longest substring without repeat #35 Medium 41 Anagram check #36 Easy 42 Valid palindrome "leetcode" #37 Easy 43 Longest substring without repeat #38 Medium 44 Anagram check #39 Easy 45 Valid palindrome "interview" #40 Easy 46 Longest substring without repeat #41 Medium 47 Anagram check #42 Easy 48 Valid palindrome "toolliyo" #43 Easy 49 Longest substring without repeat #44 Medium 50 Anagram check #45 Easy