Leetcode 12. Integer to Roman

佚名 6年前 (2019-04-26) 随笔 373人围观抢沙发百度已收录

https://leetcode.com/problems/integer-to-roman/submissions/

using namespace std;
class Solution {
public:
    string reps="IVXLCDM";
    
    string itor(int k,int l){
        switch(k){
            case 0: 
            case 1: 
            case 2: 
            case 3: return string(k,reps[l]);
            case 4: return reps[l]+string(1,reps[l+1]);
            case 5: return string(1,reps[l+1]);
            case 6: 
            case 7:
            case 8: return reps[l+1]+string((k%5),reps[l]);
            case 9: return reps[l]+string(1,reps[l+2]);
        }
        return "";
    }
    string intToRoman(int num) {
        string ans;
        ans+=itor(num/1000,6),num%=1000;
        ans+=itor(num/100,4),num%=100;
        ans+=itor(num/10,2),num%=10;
        ans+=itor(num,0);
        return ans;
    }
};