chore(CPlusPlus): add balanced parenthesis problem (#930)

algorithms/CPlusPlus/Arrays/balanced-parenthesis.cpp

@@ -0,0 +1,70 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+bool areBracketsBalanced (string expr) 
+{
+
+  stack < char >s;
+  char x;
+
+
+  // Traversing the Expression
+  for (int i = 0; i < expr.length (); i++)
+   if (expr[i] == '(' || expr[i] == '[' ||expr[i] == '{')
+  {
+   // Push the element in the stack
+   s.push (expr[i]);
+   continue;
+  }
+
+  // IF current current character is not opening
+  // bracket, then it must be closing. So stack
+  // cannot be empty at this point.
+ 
+  if (s.empty ()) 
+    return false;
+
+switch (expr[i])
+{
+
+ case ')': // Store the top element in a
+            x = s.top ();
+            s.pop ();
+
+  if (x == '{' || x == '[')
+   return false;
+
+   break;
+
+case '}': // Store the top element in b
+          x = s.top ();
+          s.pop ();
+   if (x == '(' || x == '[') 
+    return false;
+    break;
+case ']': x = s.top ();
+          s.pop ();
+  if (x == '(' || x == '{')
+     return false;
+     break;
+   }
+ }
+return (s.empty ());
+}
+// Driver code
+int main () 
+{
+  string expr = "{()}[]";
+ // Function call
+ if (areBracketsBalanced (expr))
+  cout << "Balanced";
+else
+  cout << "Not Balanced";
+  return 0;
+}
+
+// Output:-
+// Enter the brackets to check if its balanced or not : [{}] 
+// Balanced
+// Enter the brackets to check if its balanced or not : {]
+Not Balanced

algorithms/CPlusPlus/README.md

@@ -31,7 +31,7 @@
 - [Next permutation](Arrays/next-permutation.cpp)
 - [Maximum Minimum Average of numbers](Arrays/max-min-avg.cpp)
 - [Sparse Matrix](Arrays/sparse_matrix.cpp)
-
+- [Balanced Parenthesis](Arrays/balanced-parenthesis.cpp)
 
 
 ## Dynamic-Programming