Practicing string in c++ for infosys aptitude on may 31st 2026.

                                                            C ++ LEARNING 

                                                               STRINGS

1. find longest palindrome - hashmap + sorting - completed

2. Longest substring without repeating character. - completed

3. minimum window substring. ← current

4. substring with concatenation of all words.

5. matching of opening and closing braces.

6. removal of vowel from word or sentence.

7. convert aaaabbcc to a4b2c2.

                                                               ARRAYS
   

8. #53 Maximum Subarray - kadane - completed

9. #11 Container With Most Water - two pointer + greedy - completed

10. #15 3Sum - sorting + two pointer - completed

11. #238 Product of Array Except Self - Prefix + Suffix - completed

12. #56 Merge Intervals - Sorting + Greedy - completed

13. #33 Search in Rotated Array ← pending

                                                              bit manipulation
    

14. #191 no of set bits - brian algorithm (n = n & (n - 1)) - completed

15. #136 single number - XOR logic ( ans ^= list ) - completed

16. #338 counting bits - brute force - completed #338 count bits ( c ) ← current (tomorrow)

                                                              STACK
    

17. #20 valide parentheses - push , top , pop - completed