Nov 14, 2025
[Hard] 460. LFU Cache
leetcodealgorithmhardcppdesigndata-structureshash-maplinked-listproblem-solving
Nov 14, 2025
Minimal, copy-paste C++ for parentheses matching, expression evaluation, nested structures, and monotonic stack.
leetcodetemplatesstackdata-structures
Nov 14, 2025
Minimal, copy-paste C++ for expression evaluation with +, −, ×, ÷ and parentheses. See also Stack for RPN and nested expressions.
leetcodetemplatescalculatorexpression-evaluation
Nov 14, 2025
[Medium] 224. Basic Calculator
leetcodealgorithmmediumcppstringstackexpression-evaluationproblem-solving
Nov 14, 2025
[Hard] 772. Basic Calculator III
leetcodealgorithmhardcppstringstackrecursionexpression-evaluationproblem-solving
Nov 14, 2025
[Medium] 227. Basic Calculator II
leetcodealgorithmmediumcppstringstackexpression-evaluationproblem-solving
Nov 5, 2025
[Medium] 324. Wiggle Sort II
leetcodealgorithmmediumcpparraysnth-elementthree-way-partitionindex-mappingproblem-solving
Nov 5, 2025
[Medium] 921. Minimum Add to Make Parentheses Valid
leetcodealgorithmmediumcppstringstackgreedyproblem-solving
Nov 5, 2025
[Easy] 20. Valid Parentheses
leetcodealgorithmeasycppstringstackproblem-solving
Nov 5, 2025
[Medium] 525. Contiguous Array
leetcodealgorithmmediumcpparrayshash-mapprefix-sumproblem-solving