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question: todo // after 5
1. check if two strings are isomorphic or not
2. minimum no of flips even one odd one
3. add two strings using the string
4. binary search in recursion
5. n queen
6. keypad problem
7.. rat in maze
8. combination sum
9. subset 1
10. subset 2
11. palindrome sub array
12. add 2 no ll
13. remove duplicate sorted ll
14. merge sort
15.flatten list
16.rotate lsit
17. reorder list , remove nodes from list , maximum twin sum , merge in btw list , partiion llist , zigzag pattenr,
oops // after 10.30
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