#include    using namespace std; // this function returns value of a Roman symbol int value(char r) {  if (r == 'I')  return 1;  if (r == 'V')  return 5;  if (r == 'X')  return 10;  if (r == 'L')  return 50;  if (r == 'C')  return 100;  if (r == 'D')  return 500;  if (r == 'M')  return 1000;  return -1; } // returns decimal value of roman numeral int romanToDecimal(string& s) {  int res = 0;   for (int i = 0; i < s.length(); i++) {    // get value of current symbol  int s1 = value(s[i]);  // Compare with the next symbol if it exists  if (i + 1 < s.length()) {  int s2 = value(s[i + 1]);  // if current value is greater or equal   // add it to result  if (s1 >= s2) {  res += s1;  }  else {  // else add the difference and skip   // next symbol  res += (s2 - s1);  i++;  }  }  else {  res += s1;  }  }  return res; } int main() {  string s = 'IX';  cout << romanToDecimal(s) << endl;  return 0; } 

class GfG {  // this function returns value of a Roman symbol  static int value(char r) {  if (r == 'I')  return 1;  if (r == 'V')  return 5;  if (r == 'X')  return 10;  if (r == 'L')  return 50;  if (r == 'C')  return 100;  if (r == 'D')  return 500;  if (r == 'M')  return 1000;  return -1;  }  // returns decimal value of roman numeral  static int romanToDecimal(String s) {  int res = 0;   for (int i = 0; i < s.length(); i++) {    //get value of current symbol  int s1 = value(s.charAt(i));  // compare with the next symbol if it exists  if (i + 1 < s.length()) {  int s2 = value(s.charAt(i + 1));  // If current value is greater or equal   // add it to result  if (s1 >= s2) {  res += s1;  }  else {  // else add the difference and skip   // next symbol  res += (s2 - s1);  i++;  }  }  else {  res += s1;  }  }  return res;  }  public static void main(String[] args) {  String s = 'IX';  System.out.println(romanToDecimal(s));  } } 

# this function returns value of a Roman symbol def value(r): if r == 'I': return 1 if r == 'V': return 5 if r == 'X': return 10 if r == 'L': return 50 if r == 'C': return 100 if r == 'D': return 500 if r == 'M': return 1000 return -1 # returns decimal value of roman numeral def romanToDecimal(s): res = 0 i = 0 while i < len(s): # get value of current symbol s1 = value(s[i]) # compare with the next symbol if it exists if i + 1 < len(s): s2 = value(s[i + 1]) # if current value is greater or equal  # add it to result if s1 >= s2: res += s1 else: # else add the difference and  # skip next symbol res += (s2 - s1) i += 1 else: res += s1 i += 1 return res if __name__ == '__main__': s = 'IX' print(romanToDecimal(s)) 

using System; class GfG {    // this function returns value of a Roman symbol  static int value(char r) {  if (r == 'I')  return 1;  if (r == 'V')  return 5;  if (r == 'X')  return 10;  if (r == 'L')  return 50;  if (r == 'C')  return 100;  if (r == 'D')  return 500;  if (r == 'M')  return 1000;  return -1;  }  // returns decimal value of roman numeral  static int romanToDecimal(string s) {  int res = 0;   for (int i = 0; i < s.Length; i++) {    // get value of current symbol  int s1 = value(s[i]);  // compare with the next symbol if it exists  if (i + 1 < s.Length) {  int s2 = value(s[i + 1]);  // if current value is greater or equal   // add it to result  if (s1 >= s2) {  res += s1;  }  else {  // else add the difference and skip  // next symbol  res += (s2 - s1);  i++;  }  }  else {  res += s1;  }  }  return res;  }  static void Main() {  string s = 'IX';  Console.WriteLine(romanToDecimal(s));  } } 

// this function returns value of a Roman symbol function value(r) {  if (r === 'I')   return 1;  if (r === 'V')   return 5;  if (r === 'X')   return 10;  if (r === 'L')   return 50;  if (r === 'C')   return 100;  if (r === 'D')   return 500;  if (r === 'M')   return 1000;  return -1; } // returns decimal value of roman numeral function romanToDecimal(s) {  let res = 0;   for (let i = 0; i < s.length; i++) {    // get value of current symbol  let s1 = value(s[i]);  // compare with the next symbol if it exists  if (i + 1 < s.length) {  let s2 = value(s[i + 1]);  // if current value is greater or equal   // add it to result  if (s1 >= s2) {  res += s1;  }  else {  // else add the difference and   // skip next symbol  res += (s2 - s1);  i++;  }  }  else {  res += s1;  }  }  return res; } // Driver Code let s = 'IX';  console.log(romanToDecimal(s)); 

#include    #include  using namespace std; int romanToDecimal(string &s) {  unordered_map<char int> romanMap = {{'I' 1}   {'V' 5}   {'X' 10}   {'L' 50}  {'C' 100}   {'D' 500}   {'M' 1000}};  int res = 0;  for (int i = 0; i < s.length(); i++) {  // if the current value is less than the next value   // subtract current from next and add to res  if (i + 1 < s.length() && romanMap[s[i]] < romanMap[s[i + 1]]) {  res += romanMap[s[i + 1]] - romanMap[s[i]];  // skip the next symbol  i++;  }  else {  // otherwise add the current value to res  res += romanMap[s[i]];  }  }  return res; } int main() {  string s = 'IX';  cout << romanToDecimal(s) << endl;  return 0; } 

import java.util.HashMap; class GfG {  static int romanToDecimal(String s) {  HashMap<Character Integer> romanMap = new HashMap<>();  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);  int res = 0;  for (int i = 0; i < s.length(); i++) {  // if the current value is less than the next value  // subtract current from next and add to res  if (i + 1 < s.length() && romanMap.get(s.charAt(i)) <   romanMap.get(s.charAt(i + 1))) {  res += romanMap.get(s.charAt(i + 1)) -   romanMap.get(s.charAt(i));  // skip the next symbol  i++;  }  else {  // otherwise add the current value to res  res += romanMap.get(s.charAt(i));  }  }  return res;  }  public static void main(String[] args) {  String s = 'IX';  System.out.println(romanToDecimal(s));  } } 

def romanToDecimal(s): romanMap = {'I': 1 'V': 5 'X': 10 'L': 50 'C': 100 'D': 500 'M': 1000} res = 0 i = 0 while i < len(s): # if the current value is less than the next value  # subtract current from next and add to res if i + 1 < len(s) and romanMap[s[i]] < romanMap[s[i + 1]]: res += romanMap[s[i + 1]] - romanMap[s[i]] # skip the next symbol i += 1 else: # otherwise add the current value to res res += romanMap[s[i]] i += 1 return res if __name__ == '__main__': s = 'IX' print(romanToDecimal(s)) 

using System; using System.Collections.Generic; class GfG {  static int romanToDecimal(string s) {    // create a map to store the Roman numeral values  Dictionary<char int> romanMap =   new Dictionary<char int> {  {'I' 1} {'V' 5} {'X' 10} {'L' 50}  {'C' 100} {'D' 500} {'M' 1000}  };  int res = 0;  for (int i = 0; i < s.Length; i++) {    // if the current value is less than the next value   // subtract current from next and add to res  if (i + 1 < s.Length && romanMap[s[i]] < romanMap[s[i + 1]]) {  res += romanMap[s[i + 1]] - romanMap[s[i]];  // skip the next symbol  i++;  }  else {    // otherwise add the current value to res  res += romanMap[s[i]];  }  }  return res;  }  static void Main() {  string s = 'IX';  Console.WriteLine(romanToDecimal(s));  } } 

function romanToDecimal(s) {    // create a map to store the Roman numeral values  const romanMap = {  'I': 1 'V': 5 'X': 10 'L': 50  'C': 100 'D': 500 'M': 1000  };  let res = 0;  for (let i = 0; i < s.length; i++) {  // if the current value is less than the next value   // subtract current from next and add to res  if (i + 1 < s.length && romanMap[s[i]] < romanMap[s[i + 1]]) {  res += romanMap[s[i + 1]] - romanMap[s[i]];  // skip the next symbol  i++;  }  else {  // otherwise add the current value to res  res += romanMap[s[i]];  }  }  return res; } // Driver Code let s = 'IX'; console.log(romanToDecimal(s));