Added cpp program

leetcode/Valid Parenthesis.cpp

@@ -0,0 +1,50 @@
+class Solution {
+public:
+    bool isValid(string expression) {
+        stack<char>s;
+        for(int i=0;i<expression.length();i++){
+            char ch = expression[i];
+        //opening parantheses push
+           if(ch=='(' || ch=='{' || ch=='[')
+           {
+              s.push(ch);
+
+           }
+        //for close parantheses check on top and pop
+        else
+        {
+            if(!s.empty()) {
+                char top=s.top();
+
+
+            if( ch==')' && top=='('
+               ||
+              ch=='}' && top=='{'
+               ||
+              ch==']' && top=='[')  
+            {
+                s.pop();
+}
+            else 
+            {
+                return false;
+}
+        }
+else {
+return false;
+}
+
+
+            }
+
+
+
+        }
+if(s.empty())
+    return true;
+
+
+else 
+    return false;
+    }
+};

leetcode/c_cpp_properties.json

@@ -0,0 +1,18 @@
+{
+  "configurations": [
+    {
+      "name": "windows-gcc-x86",
+      "includePath": [
+        "${workspaceFolder}/**"
+      ],
+      "compilerPath": "C:/MinGW/bin/gcc.exe",
+      "cStandard": "${default}",
+      "cppStandard": "${default}",
+      "intelliSenseMode": "windows-gcc-x86",
+      "compilerArgs": [
+        ""
+      ]
+    }
+  ],
+  "version": 4
+}