Understand pattern to solve coding questions

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Instead of learning solutions to LeetCode questions, understand patterns!!
If the input array is sorted
-binary search
-two pointers
If asked for all permutations/subsets then
-Backtracking
If given a tree/Graph then
-DFS
-BFS
If given a linked list then
-two pointers
If recursion is banned
-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
else
-map/set for O(1) time & O(n) space
-sort input for O(nlogn) time and O(1) SPACE

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