LeetCode -- Roman to Integer

标签：

public class Solution {
    public int RomanToInt(string s) 
    {
       if(string.IsNullOrEmpty(s))
       {
    		return 0;
    	}
    	
    	var len = s.Length;
    	var result = Convert(s[0]);
    	if(len < 2){
    		return result;
    	}
    	for(var i = 1;i < len; i++){
    		var pre = Convert(s[i - 1]);
    		var current = Convert(s[i]);
    		
    		if(current <= pre){
    			result += current;
    		}else{
    			result = result - 2 * pre + current;
    		}
    	}
    	
    	return result;
    }
	
private int Convert(char c) 
{
	switch (c) {
		case ‘I‘:  
			return 1;
		case ‘V‘:
			return 5;
		case ‘X‘:  
			return 10;  
		case ‘L‘:  
			return 50;  
		case ‘C‘:  
			return 100;  
		case ‘D‘:  
			return 500;  
		case ‘M‘:  
			return 1000;  
		default : 
			throw new ArgumentException();
	}
}
}

LeetCode -- Roman to Integer

标签：

原文地址：http://blog.csdn.net/lan_liang/article/details/49704123