leetcode 12 Integer to Roman
2014-05-06 22:39
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Given an integer, convert it to a roman numeral.
Input is guaranteed to be within the range from 1 to 3999.
Input is guaranteed to be within the range from 1 to 3999.
class Solution { public: string intToRoman(int num) { string ans; int number; int i=0; char ch[7] ={'I','V','X','L','C','D','M'}; while(num!=0) { number=num%10; switch(number){ case 1 : case 2 : case 3 : { ans.insert(0,number,ch[2*i]); break; } case 4 : { ans.insert(0,1,ch[2*i+1]); ans.insert(0,1,ch[2*i]); break; } case 5 : { ans.insert(0,1,ch[2*i+1]); break; } case 6 : case 7 : case 8 : { ans.insert(0,number-5,ch[2*i]); ans.insert(0,1,ch[2*i+1]); break; } case 9 : { ans.insert(0,1,ch[2*i+2]); ans.insert(0,1,ch[2*i]); break; } } num=num/10; i++; } return ans; } };
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