From b1feaf1985a5d8f2965239dafecce6bfeaf48c99 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Tue, 7 Jul 2020 18:06:49 +0800
Subject: import(solutions): Add problem 12.

---
 works/solutions/cpp/12.cpp | 51 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 works/solutions/cpp/12.cpp

(limited to 'works/solutions/cpp/12.cpp')

diff --git a/works/solutions/cpp/12.cpp b/works/solutions/cpp/12.cpp
new file mode 100644
index 0000000..68eb4b4
--- /dev/null
+++ b/works/solutions/cpp/12.cpp
@@ -0,0 +1,51 @@
+#include <string>
+
+using std::string;
+
+const char *roman_digits = "IVXLCDM";
+
+class Solution
+{
+public:
+    string intToRoman(int num)
+    {
+        string result;
+
+        int current_digit_index = 0;
+
+        while (num != 0)
+        {
+            const int digit = num % 10;
+            if (digit == 9)
+            {
+                result += roman_digits[current_digit_index + 2];
+                result += roman_digits[current_digit_index];
+            }
+            else if (digit <= 8 && digit >= 5)
+            {
+                for (int i = 0; i < digit - 5; i++)
+                {
+                    result += roman_digits[current_digit_index];
+                }
+                result += roman_digits[current_digit_index + 1];
+            }
+            else if (digit == 4)
+            {
+                result += roman_digits[current_digit_index + 1];
+                result += roman_digits[current_digit_index];
+            }
+            else
+            {
+                for (int i = 0; i < digit; i++)
+                {
+                    result += roman_digits[current_digit_index];
+                }
+            }
+
+            num /= 10;
+            current_digit_index += 2;
+        }
+
+        return string(result.crbegin(), result.crend());
+    }
+};
\ No newline at end of file
-- 
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