Update synonymous-sentences.cpp

kamyu104 · web-flow · commit abe1aa552746 · 2019-11-17T04:38:44.000+08:00
diff --git a/C++/synonymous-sentences.cpp b/C++/synonymous-sentences.cpp
@@ -77,6 +77,9 @@ class Solution {
     }
     
     string join(const vector<string>& strings, const string& delim) const {
+        if (strings.empty()) {
+            return "";
+        }
         ostringstream imploded;
         copy(strings.begin(), prev(strings.end()), ostream_iterator<string>(imploded, delim.c_str()));
         return imploded.str() + *prev(strings.end());

Original file line number	Diff line number	Diff line change
`@@ -77,6 +77,9 @@ class Solution {`
`77`	`77`	`}`
`78`	`78`
`79`	`79`	`string join(const vector<string>& strings, const string& delim) const {`
	`80`	`+ if (strings.empty()) {`
	`81`	`+ return "";`
	`82`	`+ }`
`80`	`83`	`ostringstream imploded;`
`81`	`84`	`copy(strings.begin(), prev(strings.end()), ostream_iterator<string>(imploded, delim.c_str()));`
`82`	`85`	`return imploded.str() + *prev(strings.end());`