feat: add cpp solution to lc problem: No.0071 (doocs#744)

Author: Dhoni77

solution/0000-0099/0071.Simplify Path/README.md

@@ -226,10 +226,27 @@ function simplifyPath(path: string): string {
 }
 ```
 
-### **...**
-
-```
+### **C++**
 
+```cpp
+class Solution {
+public:
+    string simplifyPath(string path) {
+        deque<string> stk;
+        string res, tmp;
+        stringstream ss(path);
+        while (getline(ss, tmp, '/')) {
+            if (tmp == "" || tmp == ".") continue;
+            if (tmp == "..") {
+                if (!stk.empty())
+                    stk.pop_back();
+            } else stk.push_back(tmp);
+        }
+        for (auto str: stk)
+            res += "/" + str;
+        return res.empty() ? "/" : res;
+    }
+};
 ```
 
 <!-- tabs:end -->

solution/0000-0099/0071.Simplify Path/README_EN.md

@@ -210,10 +210,27 @@ function simplifyPath(path: string): string {
 }
 ```
 
-### **...**
-
-```
+### **C++**
 
+```cpp
+class Solution {
+public:
+    string simplifyPath(string path) {
+        deque<string> stk;
+        string res, tmp;
+        stringstream ss(path);
+        while (getline(ss, tmp, '/')) {
+            if (tmp == "" || tmp == ".") continue;
+            if (tmp == "..") {
+                if (!stk.empty())
+                    stk.pop_back();
+            } else stk.push_back(tmp);
+        }
+        for (auto str: stk)
+            res += "/" + str;
+        return res.empty() ? "/" : res;
+    }
+};
 ```
 
 <!-- tabs:end -->

solution/0000-0099/0071.Simplify Path/Solution.cpp

@@ -0,0 +1,18 @@
+class Solution {
+public:
+    string simplifyPath(string path) {
+        deque<string> stk;
+        string res, tmp;
+        stringstream ss(path);
+        while (getline(ss, tmp, '/')) {
+            if (tmp == "" || tmp == ".") continue;
+            if (tmp == "..") {
+                if (!stk.empty())
+                    stk.pop_back();
+            } else stk.push_back(tmp);
+        }
+        for (auto str: stk)
+            res += "/" + str;
+        return res.empty() ? "/" : res;
+    }
+};