Package g0301_0400.s0399_evaluate_division

Class Solution

java.lang.Object

g0301_0400.s0399_evaluate_division.Solution

public class Solution
extends Object

399 - Evaluate Division\. Medium You are given an array of variable pairs `equations` and an array of real numbers `values`, where equations[i] = [Ai, Bi] and `values[i]` represent the equation Ai / Bi = values[i]. Each Ai or Bi is a string that represents a single variable. You are also given some `queries`, where queries[j] = [Cj, Dj] represents the jth query where you must find the answer for Cj / 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.

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
double[]	calcEquation(List<List<String>> equations, double[] values, List<List<String>> queries)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Solution

public Solution()

Method Details

calcEquation

public double[] calcEquation(List<List<String>> equations,
 double[] values,
 List<List<String>> queries)