From dcd35ef751197055a01e58959485879961eb0d29 Mon Sep 17 00:00:00 2001
From: Ruslan Valeev <ruslan.valeev@hotmail.com>
Date: Mon, 6 Apr 2026 12:17:05 -0600
Subject: [PATCH] Added RomanToInt solution for LeetCode Task

---
 MathTasks/LeetCodeTrainings/RomanToInt.cs | 142 ++++++++++++++++++++++
 MathTasks/MathTasks.csproj                |   4 +-
 2 files changed, 144 insertions(+), 2 deletions(-)
 create mode 100644 MathTasks/LeetCodeTrainings/RomanToInt.cs

diff --git a/MathTasks/LeetCodeTrainings/RomanToInt.cs b/MathTasks/LeetCodeTrainings/RomanToInt.cs
new file mode 100644
index 0000000..60122b2
--- /dev/null
+++ b/MathTasks/LeetCodeTrainings/RomanToInt.cs
@@ -0,0 +1,142 @@
+namespace MathTasks.LeetCodeTrainings
+{
+    public class RomanToInt
+    {
+        static void Main(string[] args)
+        {
+            RomanToIntOption("MCMXCIV");
+        }
+        public static int RomanToIntOption(string s)
+        {
+            var result = 0;
+
+            for (var i = 0; i < s.Length; i++)
+            {
+                var convertedChar = charToInt(s[i]);
+
+                if (i < (s.Length - 1) && convertedChar < charToInt(s[i + 1]))
+                {
+                    result -= convertedChar;
+                }
+                else
+                {
+                    result += convertedChar;
+                }
+            }
+
+            Console.WriteLine(result);
+            return result;
+        }
+
+        public static int charToInt(char c)
+        {
+            var result = 0;
+            switch (c)
+            {
+                case 'I':
+                    return result = 1;
+                case 'V':
+                    return result = 5;
+                case 'X':
+                    return result = 10;
+                case 'L':
+                    return result = 50;
+                case 'C':
+                    return result = 100;
+                case 'D':
+                    return result = 500;
+                case 'M':
+                    return result = 1000;
+            }
+            return result;
+        }
+    }    
+}
+
+/*Roman to Integer
+
+Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M.
+
+Symbol       Value
+I             1
+V             5
+X             10
+L             50
+C             100
+D             500
+M             1000
+
+For example, 2 is written as II in Roman numeral, just two ones added together. 12 is written as XII, which is simply X + II. The number 27 is written as XXVII, which is XX + V + II.
+
+Roman numerals are usually written largest to smallest from left to right. However, the numeral for four is not IIII. Instead, the number four is written as IV. Because the one is before the five we subtract it making four. The same principle applies to the number nine, which is written as IX. There are six instances where subtraction is used:
+
+I can be placed before V (5) and X (10) to make 4 and 9. 
+X can be placed before L (50) and C (100) to make 40 and 90. 
+C can be placed before D (500) and M (1000) to make 400 and 900.
+Given a roman numeral, convert it to an integer. 
+
+Example 1:
+
+Input: s = "III"
+Output: 3
+Explanation: III = 3.
+Example 2:
+
+Input: s = "LVIII"
+Output: 58
+Explanation: L = 50, V= 5, III = 3.
+Example 3:
+
+Input: s = "MCMXCIV"
+Output: 1994
+Explanation: M = 1000, CM = 900, XC = 90 and IV = 4.
+ 
+
+Constraints:
+
+1 <= s.length <= 15
+s contains only the characters ('I', 'V', 'X', 'L', 'C', 'D', 'M').
+It is guaranteed that s is a valid roman numeral in the range [1, 3999].Roman to Integer
+
+Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M.
+
+Symbol       Value
+I             1
+V             5
+X             10
+L             50
+C             100
+D             500
+M             1000
+
+For example, 2 is written as II in Roman numeral, just two ones added together. 12 is written as XII, which is simply X + II. The number 27 is written as XXVII, which is XX + V + II.
+
+Roman numerals are usually written largest to smallest from left to right. However, the numeral for four is not IIII. Instead, the number four is written as IV. Because the one is before the five we subtract it making four. The same principle applies to the number nine, which is written as IX. There are six instances where subtraction is used:
+
+I can be placed before V (5) and X (10) to make 4 and 9. 
+X can be placed before L (50) and C (100) to make 40 and 90. 
+C can be placed before D (500) and M (1000) to make 400 and 900.
+Given a roman numeral, convert it to an integer. 
+
+Example 1:
+
+Input: s = "III"
+Output: 3
+Explanation: III = 3.
+Example 2:
+
+Input: s = "LVIII"
+Output: 58
+Explanation: L = 50, V= 5, III = 3.
+Example 3:
+
+Input: s = "MCMXCIV"
+Output: 1994
+Explanation: M = 1000, CM = 900, XC = 90 and IV = 4.
+ 
+
+Constraints:
+
+1 <= s.length <= 15
+s contains only the characters ('I', 'V', 'X', 'L', 'C', 'D', 'M').
+It is guaranteed that s is a valid roman numeral in the range [1, 3999]. */
\ No newline at end of file
diff --git a/MathTasks/MathTasks.csproj b/MathTasks/MathTasks.csproj
index f7b34a0..483c1ca 100644
--- a/MathTasks/MathTasks.csproj
+++ b/MathTasks/MathTasks.csproj
@@ -1,11 +1,11 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <TargetFramework>net6.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
-	<StartupObject>MathTasks.Task_2_ForLoop</StartupObject>
+	<StartupObject>MathTasks.LeetCodeTrainings.RomanToInt</StartupObject>
   </PropertyGroup>
 
 </Project>