Update roman-to-integer.cpp

RanceJen · RanceJen · commit 85c51992f822 · 2018-11-03T18:15:27.000+08:00
add one extra condition even the leetcode didn't care about it
diff --git a/C++/roman-to-integer.cpp b/C++/roman-to-integer.cpp
@@ -8,7 +8,7 @@ class Solution {
                                                 {'L',   50}, {'C', 100}, {'D', 500},
                                                 {'M', 1000}};
         return accumulate(s.crbegin() , s.crend() , 0 , [&numeral_map](int sum , char c){
-            return sum += ((numeral_map[c] * 5 <= sum) ?  -numeral_map[c]: numeral_map[c]);
+            return sum += ((numeral_map[c] * 5 <= sum) && (c!= 'M') ?  -numeral_map[c]: numeral_map[c]);
         });
     }
 };

Original file line number	Diff line number	Diff line change
`@@ -8,7 +8,7 @@ class Solution {`
`8`	`8`	`{'L', 50}, {'C', 100}, {'D', 500},`
`9`	`9`	`{'M', 1000}};`
`10`	`10`	`return accumulate(s.crbegin() , s.crend() , 0 , [&numeral_map](int sum , char c){`
`11`		`- return sum += ((numeral_map[c] * 5 <= sum) ? -numeral_map[c]: numeral_map[c]);`
	`11`	`+ return sum += ((numeral_map[c] * 5 <= sum) && (c!= 'M') ? -numeral_map[c]: numeral_map[c]);`
`12`	`12`	`});`
`13`	`13`	`}`
`14`	`14`	`};`