adding leetcode problem solution

leetcode/p1662_check_two_strings.cpp

@@ -0,0 +1,25 @@
+class Solution {
+public:
+    bool arrayStringsAreEqual(vector<string>& word1, vector<string>& word2) {
+        std::string s1="";
+        std::string s2="";
+        unsigned int size = word1.size();
+        // traverse word1 and concatenate all strings
+        // save it in s1
+        for(unsigned int i=0;i<size;i++){
+            s1 = s1 + word1[i];
+        }
+        size = word2.size();
+        // traverse word2 and concatenate all strings
+        // save it in s2
+        for(unsigned int i=0;i<size;i++){
+            s2 = s2 + word2[i];
+        }
+        // if they are equivanent
+        if(s1==s2){
+            return true;
+        }else{
+            return false;
+        }
+    }
+};