이슈 #378에서 솔루션 추가

Programmers/로그인_성공.cpp

@@ -0,0 +1,22 @@
+#include <string>
+#include <vector>
+
+using namespace std;
+
+string solution(vector<string> id_pw, vector<vector<string>> db) {
+    bool id = false;
+
+    for (int i = 0; i < db.size(); i++) {
+        if (id_pw[0] == db[i][0]) {
+            id = true;
+
+            for (int j = 0; j < db[i].size(); j++) {
+                if (id_pw[1] == db[i][1]) {
+                    return "login";
+                }
+            }
+        }
+    }
+
+    return id == true ? "wrong pw" : "fail";
+}