adding word pattern leetcode problem

leetcode/p290_word_pattern.cpp

@@ -0,0 +1,47 @@
+class Solution {
+public:
+    bool wordPattern(string pattern, string s) {
+        map<char,string> map1;
+        map<string,char> map2;
+        vector<string> v1;
+        // convert s to v1
+        int len = s.length();
+        string s1;
+        // this loop converts string s into a vector<string>
+        for(int i=0;i<len;i++){      
+            if(s[i]!=' '){      
+                s1.push_back(s[i]);
+            }else{
+                // every time we encounter a space, push the string s1 into v.
+                cout<<s1<<endl;
+                v1.push_back(s1);
+                s1.clear();
+            }
+        }
+        // one more string left, because there is not more space.
+        cout<<s1<<endl;
+        v1.push_back(s1);
+
+        if(pattern.length()!=v1.size()){
+            return false;
+        }
+
+        int len_p = pattern.length();
+        // 1. create the maps
+        for(int i=0;i<len_p;i++){
+            map1[pattern[i]] = v1[i];
+            map2[v1[i]] = pattern[i];
+        }
+
+        // 2. use the maps
+        for(int i=0;i<len_p;i++){
+            if(map1[pattern[i]]!=v1[i]){
+                return false;
+            }
+            if((map2[v1[i]])!=pattern[i]){
+                return false;
+            }
+        }
+        return true;
+    }
+};