[20260201] BOJ / G5 / 로마 숫자 / 이준희

Author: JHLEE325

JHLEE325/202602/01 BOJ G5 로마 숫자.md

@@ -0,0 +1,62 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    static Map<Character, Integer> romanMap = new HashMap<>();
+
+    static int[] values = {1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1};
+    static String[] symbols = {"M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"};
+
+    public static void main(String[] args) throws IOException {
+        initMap();
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+        String s1 = br.readLine();
+        String s2 = br.readLine();
+
+        int sum = romanToArab(s1) + romanToArab(s2);
+
+        System.out.println(sum);
+        System.out.println(arabToRoman(sum));
+    }
+
+    static void initMap() {
+        romanMap.put('I', 1);
+        romanMap.put('V', 5);
+        romanMap.put('X', 10);
+        romanMap.put('L', 50);
+        romanMap.put('C', 100);
+        romanMap.put('D', 500);
+        romanMap.put('M', 1000);
+    }
+
+    static int romanToArab(String s) {
+        int total = 0;
+        for (int i = 0; i < s.length(); i++) {
+            int current = romanMap.get(s.charAt(i));
+
+            if (i + 1 < s.length() && current < romanMap.get(s.charAt(i + 1))) {
+                total -= current;
+            } else {
+                total += current;
+            }
+        }
+        return total;
+    }
+
+    static String arabToRoman(int num) {
+        StringBuilder sb = new StringBuilder();
+        int i = 0;
+        while (num > 0) {
+            if (num >= values[i]) {
+                sb.append(symbols[i]);
+                num -= values[i];
+            } else {
+                i++;
+            }
+        }
+        return sb.toString();
+    }
+}
+```