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Tips to solve the DSA questions by recognizing their pattern.

Tips to solve the DSA questions by recognizing their pattern.


If given a linked list then

✒ Two pointers


If the input array is sorted then

✒ Binary search

✒ Two pointers


If asked for all permutations/subsets then

✒ Backtracking


If given a tree or a graph then

✒ DFS

✒ BFS


If recursion is banned then

✒ Stack


If must solve in-place then

✒ Swap corresponding values

✒ Store one or more different values in the same pointer


If asked for maximum/minimum subarray/subset/options then

✒ Dynamic programming


If asked for top/least K items then

✒ Heap


If asked for common strings then

✒ Map

✒ Trie


General Tips

✒ Map/Set for O(1) time & O(n) space

✒ Sort input for O(nlogn) time and O(1) space


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