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-rw-r--r--roman_2_int.cpp43
1 files changed, 43 insertions, 0 deletions
diff --git a/roman_2_int.cpp b/roman_2_int.cpp
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--- /dev/null
+++ b/roman_2_int.cpp
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+#include "leetcode.h"
+
+class Solution {
+public:
+ int romanToInt(string s) {
+ int ans = 0, num = 0;
+ for (int i = s.size() - 1; ~i; i--) {
+ switch (s[i]) {
+ case 'I':
+ num = 1;
+ break;
+ case 'V':
+ num = 5;
+ break;
+ case 'X':
+ num = 10;
+ break;
+ case 'L':
+ num = 50;
+ break;
+ case 'C':
+ num = 100;
+ break;
+ case 'D':
+ num = 500;
+ break;
+ case 'M':
+ num = 1000;
+ break;
+ }
+ if (4 * num < ans)
+ ans -= num;
+ else
+ ans += num;
+ }
+ return ans;
+ }
+};
+
+int main() {
+ Solution obj;
+ cout << obj.romanToInt("MCMXCIVMCMXCIV");
+}