Roman-Integer files added

algorithms/CPlusPlus/roman-integer.cpp

@@ -0,0 +1,70 @@
+#include <iostream>
+#include <unordered_map>
+
+using namespace std;
+
+string intToRoman(int num) {
+    // Define the symbols and their corresponding values
+    unordered_map<int, string> symbol_map = {
+        {1000, "M"},
+        {900, "CM"},
+        {500, "D"},
+        {400, "CD"},
+        {100, "C"},
+        {90, "XC"},
+        {50, "L"},
+        {40, "XL"},
+        {10, "X"},
+        {9, "IX"},
+        {5, "V"},
+        {4, "IV"},
+        {1, "I"}
+    };
+
+    // Build the Roman numeral string
+    string roman = "";
+    for (auto& [value, symbol] : symbol_map) {
+        while (num >= value) {
+            roman += symbol;
+            num -= value;
+        }
+    }
+    return roman;
+}
+
+int romanToInt(string s) {
+    // Define the symbols and their corresponding values
+    unordered_map<char, int> symbol_map = {
+        {'M', 1000},
+        {'D', 500},
+        {'C', 100},
+        {'L', 50},
+        {'X', 10},
+        {'V', 5},
+        {'I', 1}
+    };
+
+    // Calculate the integer value
+    int value = 0;
+    for (int i = 0; i < s.length(); i++) {
+        if (i > 0 && symbol_map[s[i]] > symbol_map[s[i-1]]) {
+            value += symbol_map[s[i]] - 2 * symbol_map[s[i-1]];
+        } else {
+            value += symbol_map[s[i]];
+        }
+    }
+    return value;
+}
+
+int main() {
+    int num = 1234;
+    string roman = intToRoman(num);
+    cout << num << " in Roman numerals is " << roman << endl;
+
+    string s = "MCCXXXIV";
+    int value = romanToInt(s);
+    cout << s << " in integer value is " << value << endl;
+
+    return 0;
+}
+