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4 pages tagged

Practice › LeetCode › LeetCode (archived) › LeetCode 07xx ›

LeetCode 772: Basic Calculator III

Problem Restatement We are given a valid arithmetic expression string s . The expression may contain: non-negative integers + - * / ( ) spaces We need to evaluate the expression and return the integer result. The expression follows normal arithmetic rules: Parentheses are evaluated first. Multiplication and division happen before addition and subtraction. Operators with the same precedence are evaluated from left to right. Integer division truncates toward zero....
leetcode string stack recursion parser May 12, 2026
Practice › LeetCode › LeetCode (archived) › LeetCode 03xx ›

LeetCode 394: Decode String

Problem Restatement We are given an encoded string s . The encoding rule is: k[encoded_string] This means encoded_string should be repeated exactly k times. For example: "3[a]" -> "aaa" "2[bc]" -> "bcbc" The encoding may be nested: "3[a2[c]]" -> "accaccacc" The input is guaranteed to be valid. Brackets are well-formed, repeat counts are positive integers, and digits only appear as repeat counts. The decoded output length will not exceed 10^5...
leetcode string stack recursion parser May 10, 2026
Practice › LeetCode › LeetCode (archived) › LeetCode 02xx ›

LeetCode 224: Basic Calculator

Problem Restatement We are given a string s representing a valid arithmetic expression. The expression may contain: Token Meaning Digits Non-negative integers + Addition - Subtraction or unary negative ( Start of a sub-expression ) End of a sub-expression Space Ignored We need to evaluate the expression and return the integer result. We cannot use built-in expression evaluators such as eval . The official statement asks us to implement a...
leetcode string stack parser May 10, 2026
Practice › LeetCode › LeetCode (archived) › LeetCode 03xx ›

LeetCode 385: Mini Parser

Problem Restatement We are given a string s . The string represents either: A single integer A nested list of integers Examples: "324" "[123,[456,[789]]]" "[-1,[2,-3],4]" We need to parse this string and return a NestedInteger object. The NestedInteger class is already provided by LeetCode. We only need to implement: deserialize(s) Input and Output Item Meaning Input A serialized string s Output A NestedInteger object Integer format May be positive or...
leetcode string stack parser design May 10, 2026