💡 Don't try to solve 10 problems in one day and then stop for a week. Solving just one problem every single morning will yield better results than any weekend "cram session."
Sliding windows, prefix sums, and reversals. Linked Lists: Fast/slow pointers and cycle detection. daily coding problem pdf
Breadth-First Search (BFS) and Depth-First Search (DFS). 💡 Don't try to solve 10 problems in
Given the mapping a = 1 , b = 2 , ... z = 26 , and an encoded message string (e.g., "111" ), count the number of ways it can be decoded. Breadth-First Search (BFS) and Depth-First Search (DFS)
: Dynamic programming, backtracking, randomized algorithms, bit manipulation, and recursion. Systems : System design and data structure design concepts.
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def num_decodings(s: str) -> int: if not s or s[0] == '0': return 0