LeetCode/Math/romanToInt.java at master · konantian/LeetCode · GitHub

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import java.util.*;

class romanToInt{
	public static void main(String args[]){
		String s = "MCMXCIV";
		System.out.println(RomanToInt(s));
	}

	public static int RomanToInt(String s) {
     int sum=0;
    if(s.indexOf("IV")!=-1){sum-=2;}
    if(s.indexOf("IX")!=-1){sum-=2;}
    if(s.indexOf("XL")!=-1){sum-=20;}
    if(s.indexOf("XC")!=-1){sum-=20;}
    if(s.indexOf("CD")!=-1){sum-=200;}
    if(s.indexOf("CM")!=-1){sum-=200;}

    char c[]=s.toCharArray();
    int count=0;

   for(;count<=s.length()-1;count++){
       if(c[count]=='M') sum+=1000;
       if(c[count]=='D') sum+=500;
       if(c[count]=='C') sum+=100;
       if(c[count]=='L') sum+=50;
       if(c[count]=='X') sum+=10;
       if(c[count]=='V') sum+=5;
       if(c[count]=='I') sum+=1;

   }

   return sum;

}
}