From ffc9e894856ac1a8d0c81453212dea3e2f2e67b9 Mon Sep 17 00:00:00 2001
From: itpark1018 <itpark1018@gmail.com>
Date: Wed, 8 May 2024 21:34:55 +0900
Subject: [PATCH] itpark1018-3

---
 itpark1018/RomanToInteger.java | 35 ++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 itpark1018/RomanToInteger.java

diff --git a/itpark1018/RomanToInteger.java b/itpark1018/RomanToInteger.java
new file mode 100644
index 0000000..6cd6db1
--- /dev/null
+++ b/itpark1018/RomanToInteger.java
@@ -0,0 +1,35 @@
+package itpark1018;
+
+import java.util.HashMap;
+
+public class RomanToInteger {
+  public int romanToInt(String s) {
+
+    HashMap<Character, Integer> romanValues = new HashMap<>();
+    romanValues.put('I', 1);
+    romanValues.put('V', 5);
+    romanValues.put('X', 10);
+    romanValues.put('L', 50);
+    romanValues.put('C', 100);
+    romanValues.put('D', 500);
+    romanValues.put('M', 1000);
+
+    int result = 0;
+    int preValue = 0;
+
+    for (int i = s.length() - 1; i >= 0 ; i--) {
+
+      int value = romanValues.get(s.charAt(i));
+
+      if (value < preValue) {
+        result -= value;
+      } else {
+        result += value;
+      }
+
+      preValue = value;
+    }
+
+    return result;
+  }
+}