28 lines
566 B
C++
28 lines
566 B
C++
#include "s0013_roman_to_integer.hpp"
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int S0013::romanToInt(string s) {
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unordered_map<string, int> map;
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map["I"] = 1;
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map["V"] = 5;
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map["X"] = 10;
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map["L"] = 50;
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map["C"] = 100;
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map["D"] = 500;
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map["M"] = 1000;
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int val{0};
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int len = s.length();
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for (int i{0}; i < len; i++) {
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if (i == len - 1) {
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val += map.at(s.substr(i, 1));
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} else {
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if (map.at(s.substr(i, 1)) < map.at(s.substr(i + 1, 1))) {
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val -= map.at(s.substr(i, 1));
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} else {
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val += map.at(s.substr(i, 1));
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}
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}
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}
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return val;
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}
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