40 lines
809 B
C++
40 lines
809 B
C++
#include <string>
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#include <iostream>
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/**
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* 12. Integer to Roman
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*
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* No desc since clear
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*/
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class Solution {
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public:
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static std::string intToRoman(int num) {
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static const char* s = "IVXLCDM";
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std::string ret;
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for (int i = 0; i < 6; i += 2, num /= 10) {
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int n = num % 10;
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if (n == 4 || n == 9) {
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ret.push_back(s[i + 1 + (n > 5)]);
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ret.push_back(s[i]);
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} else {
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ret.append(n % 5, s[i]);
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if (n >= 5) ret.push_back(s[i + 1]);
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}
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}
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ret.append(num, 'M');
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std::reverse(ret.begin(), ret.end());
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return ret;
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}
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};
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int main() {
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for (int i = 1; i <= 50; ++i) {
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std::cout << Solution::intToRoman(i) << "\n";
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}
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std::cout << Solution::intToRoman(3) << "\n";
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std::cout << Solution::intToRoman(58) << "\n";
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std::cout << Solution::intToRoman(1994) << "\n";
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return 0;
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}
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