https://leetcode.com/problems/is-subsequence
Source
bool isSubsequence(string s, string t)...
https://leetcode.com/problems/add-strings
Source
string addStrings(string num1, string num...
https://leetcode.com/problems/find-pivot-index
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int pivotIndex(vector<int>&...
https://leetcode.com/problems/longest-palindrome/
Source
int longestPalindrome(string s) {...
https://leetcode.com/problems/contains-duplicate-ii/
Source
bool containsNearbyDuplicate(c...
