LeetCode 770: Basic Calculator IV Solution
Master LeetCode problem 770 (Basic Calculator IV), a hard challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.
770. Basic Calculator IV
Problem Explanation
Explanation
To solve this problem, we can use a combination of parsing, evaluating expressions, and manipulating polynomials. We will first parse the input expression and evaluate it using the given evaluation map. Then, we will manipulate the resulting polynomial to format the output as required.
- Parsing Input: We will parse the input expression and create a list of tokens where each token is a variable, constant, operator, or parentheses.
- Evaluating Expression: We will evaluate the expression using the evaluation map provided. This involves evaluating expressions within parentheses, performing arithmetic operations, and substituting variables with their corresponding values.
- Manipulating Polynomials: After evaluating the expression, we will represent it as a polynomial. We will then format the polynomial terms according to the specified rules and output the simplified expression.
Time Complexity: The time complexity of this approach is O(N * M), where N is the length of the expression and M is the number of unique terms in the resulting polynomial.
Space Complexity: The space complexity is also O(N * M) due to the storage needed for the intermediate tokens and polynomial terms.
Solution Code
import java.util.*;
class Solution {
public List<String> basicCalculatorIV(String expression, String[] evalvars, int[] evalints) {
// Implement the solution in Java
}
}Try It Yourself
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