Add stacks for c-or-cpp (#80)

stacks/README.md

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+# Stacks
+
+### C or C++
+
+1. [Balanced Paranthesis](c-or-cpp/balanced-paranthesis.cpp)

stacks/c-or-cpp/balanced-paranthesis.cpp

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+#include<bits/stdc++.h>
+using namespace std;
+bool isBalanced(string s) {
+	stack<char> st;
+	char ch;
+	for (int i = 0; i < s.length(); i++) {
+		if (s[i] == '(' || s[i] == '[' || s[i] == '{') {
+			st.push(s[i]);
+			continue;
+		}
+		if (st.empty())
+			return false;
+		switch (s[i]) {
+		case ')':
+			ch = st.top();
+			st.pop();
+			if (ch == '{' || ch == '[')
+				return false;
+			break;
+		case '}':
+			ch = st.top();
+			st.pop();
+			if (ch == '(' || ch == '[')
+				return false;
+			break;
+		case ']':
+			ch = st.top();
+			st.pop();
+			if (ch == '(' || ch == '{')
+				return false;
+			break;
+		}
+	}
+	return (st.empty());
+}
+int main() {
+	string input = "{}[({})]";
+	if (isBalanced(input))
+		cout << "Balanced";
+	else
+		cout << "Not Balanced";
+	return 0;
+}