이슈 #321에서 솔루션 추가

Programmers/가위_바위_보.cpp

@@ -0,0 +1,18 @@
+#include <string>
+#include <vector>
+
+using namespace std;
+
+string solution(string rsp) {
+    string answer = "";
+    for (char c : rsp) {
+        if (c == '2')
+            answer += "0";
+        else if (c == '0')
+            answer += "5";
+        else if (c == '5')
+            answer += "2";
+    }
+
+    return answer;
+}