{leetcode}/problems/evaluate-division/[LeetCode - Evaluate Division^]
Equations are given in the format A / B = k, where A and B are variables represented as strings, and k is a real number (floating point number). Given some queries, return the answers. If the answer does not exist, return -1.0.
Example:
Given ` a / b = 2.0, b / c = 3.0.`
queries are: ` a / c = ?, b / a = ?, a / e = ?, a / a = ?, x / x = ? .`
return ` [6.0, 0.5, -1.0, 1.0, -1.0 ].`
The input is: ` vector<pair<string, string>> equations, vector<double>& values, vector<pair<string, string>> queries , where `equations.size() == values.size(), and the values are positive. This represents the equations. Return ` vector<double>`.
According to the example above:
equations = [ ["a", "b"], ["b", "c"] ], values = [2.0, 3.0], queries = [ ["a", "c"], ["b", "a"], ["a", "e"], ["a", "a"], ["x", "x"] ].
The input is always valid. You may assume that evaluating the queries will result in no division by zero and there is no contradiction.
link:{sourcedir}/_0399_EvaluateDivision.java[role=include]