Class Solution
- java.lang.Object
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- g0301_0400.s0399_evaluate_division.Solution
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public class Solution extends Object
399 - Evaluate Division.Medium
You are given an array of variable pairs
equations
and an array of real numbersvalues
, whereequations[i] = [Ai, Bi]
andvalues[i]
represent the equationAi / Bi = values[i]
. EachAi
orBi
is a string that represents a single variable.You are also given some
queries
, wherequeries[j] = [Cj, Dj]
represents thejth
query where you must find the answer forCj / Dj = ?
.Return the answers to all queries. If a single answer cannot be determined, return
-1.0
.Note: The input is always valid. You may assume that evaluating the queries will not result in division by zero and that there is no contradiction.
Example 1:
Input: equations = [[“a”,“b”],[“b”,“c”]], values = [2.0,3.0], queries = [[“a”,“c”],[“b”,“a”],[“a”,“e”],[“a”,“a”],[“x”,“x”]]
Output: [6.00000,0.50000,-1.00000,1.00000,-1.00000]
Explanation:
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 ]
Example 2:
Input: equations = [[“a”,“b”],[“b”,“c”],[“bc”,“cd”]], values = [1.5,2.5,5.0], queries = [[“a”,“c”],[“c”,“b”],[“bc”,“cd”],[“cd”,“bc”]]
Output: [3.75000,0.40000,5.00000,0.20000]
Example 3:
Input: equations = [[“a”,“b”]], values = [0.5], queries = [[“a”,“b”],[“b”,“a”],[“a”,“c”],[“x”,“y”]]
Output: [0.50000,2.00000,-1.00000,-1.00000]
Constraints:
1 <= equations.length <= 20
equations[i].length == 2
1 <= Ai.length, Bi.length <= 5
values.length == equations.length
0.0 < values[i] <= 20.0
1 <= queries.length <= 20
queries[i].length == 2
1 <= Cj.length, Dj.length <= 5
Ai, Bi, Cj, Dj
consist of lower case English letters and digits.
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Constructor Summary
Constructors Constructor Description Solution()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description double[]
calcEquation(List<List<String>> equations, double[] values, List<List<String>> queries)
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