150. Evaluate Reverse Polish Notation

2024-01-31 00:49:39 +03:00
parent 1e43adf29e
commit 9d50f345d1
5 changed files with 84 additions and 5 deletions
--- a/.idea/.idea.Leetcode/.idea/workspace.xml
+++ b/.idea/.idea.Leetcode/.idea/workspace.xml
@@ -88,9 +88,9 @@
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-      <change afterPath="$PROJECT_DIR$/14. Longest Common Prefix/Solution.cs" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/150. Evaluate Reverse Polish Notation/150. Evaluate Reverse Polish Notation.csproj" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/150. Evaluate Reverse Polish Notation/Program.cs" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/150. Evaluate Reverse Polish Notation/Solution.cs" afterDir="false" />
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@@ -127,6 +127,7 @@
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@@ -149,7 +150,7 @@
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@@ -402,6 +403,24 @@
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+    <configuration name="150. Evaluate Reverse Polish Notation" type="DotNetProject" factoryName=".NET Project" temporary="true">
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@@ -1628,6 +1647,7 @@
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@@ -1642,7 +1662,7 @@
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+      <workItem from="1706644472303" duration="6672000" />
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    <servers />
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--- a/Notation.csproj
+++ b/Notation.csproj
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net8.0</TargetFramework>
+        <RootNamespace>_150._Evaluate_Reverse_Polish_Notation</RootNamespace>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+</Project>
--- a/Notation/Program.cs
+++ b/Notation/Program.cs
@@ -0,0 +1,11 @@
+// See https://aka.ms/new-console-template for more information
+
+using _150._Evaluate_Reverse_Polish_Notation;
+
+string[] arr = ["10", "1", "1", "2", "+", "+", "+"];
+var sol = new Solution();
+int n = 100000;
+while(n-- > 0)
+    Console.WriteLine(sol.EvalRPN(["10", "1", "1", "2", "+", "+", "+"]));
+
+    
--- a/Notation/Solution.cs
+++ b/Notation/Solution.cs
@@ -0,0 +1,31 @@
+namespace _150._Evaluate_Reverse_Polish_Notation;
+
+public class Solution
+{
+    public int EvalRPN(string[] tokens)
+    {
+        var stack = new Stack<int>(tokens.Length);
+        foreach (var token in tokens)
+        {
+            if (int.TryParse(token, out var number))
+                stack.Push(number);
+            else
+            {
+                int right = stack.Pop();
+                int left = stack.Pop();
+                char op = token[0];
+                stack.Push(Calc(op, left, right));
+            }
+        }
+        return stack.Pop();
+    }
+
+    private int Calc(char op, int left, int right) => op switch
+    {
+        '+' => left + right,
+        '-' => left - right,
+        '*' => left * right,
+        '/' => left / right,
+        _ => throw new ArgumentOutOfRangeException()
+    };
+}
--- a/Leetcode.sln
+++ b/Leetcode.sln
@@ -167,6 +167,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "225. Implement Stack using
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "14. Longest Common Prefix", "14. Longest Common Prefix\14. Longest Common Prefix.csproj", "{E1C1A088-861F-4E6D-A3D4-631C3B207A5F}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "150. Evaluate Reverse Polish Notation", "150. Evaluate Reverse Polish Notation\150. Evaluate Reverse Polish Notation.csproj", "{10A95EED-FD1D-40E7-B9E0-2DD48BE05AB9}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -501,6 +503,10 @@ Global
 		{E1C1A088-861F-4E6D-A3D4-631C3B207A5F}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{E1C1A088-861F-4E6D-A3D4-631C3B207A5F}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{E1C1A088-861F-4E6D-A3D4-631C3B207A5F}.Release|Any CPU.Build.0 = Release|Any CPU
+		{10A95EED-FD1D-40E7-B9E0-2DD48BE05AB9}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{10A95EED-FD1D-40E7-B9E0-2DD48BE05AB9}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{10A95EED-FD1D-40E7-B9E0-2DD48BE05AB9}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{10A95EED-FD1D-40E7-B9E0-2DD48BE05AB9}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE