Basic Calculator II
Basic Calculator II
Given a string s representing a mathematical expression, evaluate the expression and return its integer value. The expression will contain non-negative integers and the operators '+', '-', '*', and '/'. Integer division should truncate towards zero. You are not permitted to use any built-in functions that evaluate expressions directly (e.g., eval()). Assume the input expression is always valid, and all intermediate results will fit within a 32-bit signed integer range.
Example 1:
Input: s = "3+2*2" Output: 7
Example 2:
Input: s = " 3/2 " Output: 1
Example 3:
Input: s = " 3+5 / 2 " Output: 5
Constraints:
1 <= s.length <= 3 * 10^5sconsists of integers and operators('+', '-', '*', '/')separated by some number of spaces.srepresents a valid expression.- All integers in the expression are non-negative and fit within
[0, 2^31 - 1]. - The final answer is guaranteed to fit within a 32-bit integer.
Similar LeetCode problem: Basic Calculator II
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Core dilemma
Efficiently parsing and evaluating an arithmetic expression with operator precedence (multiplication/division before addition/subtraction) without using built-in evaluation functions, while handling potential integer overflow and space characters.
3 tradeoffs and 3 stress tests locked
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Basic Calculator II
Basic Calculator II
Given a string s representing a mathematical expression, evaluate the expression and return its integer value. The expression will contain non-negative integers and the operators '+', '-', '*', and '/'. Integer division should truncate towards zero. You are not permitted to use any built-in functions that evaluate expressions directly (e.g., eval()). Assume the input expression is always valid, and all intermediate results will fit within a 32-bit signed integer range.
Example 1:
Input: s = "3+2*2" Output: 7
Example 2:
Input: s = " 3/2 " Output: 1
Example 3:
Input: s = " 3+5 / 2 " Output: 5
Constraints:
1 <= s.length <= 3 * 10^5sconsists of integers and operators('+', '-', '*', '/')separated by some number of spaces.srepresents a valid expression.- All integers in the expression are non-negative and fit within
[0, 2^31 - 1]. - The final answer is guaranteed to fit within a 32-bit integer.
Similar LeetCode problem: Basic Calculator II