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BalancedParanthesis.cpp
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#include <bits/stdc++.h>
using namespace std;
bool isValid(string s)
{
int n = s.size();
stack<char> st;
bool ans = true;
for (int i = 0; i < n; i++)
{
if (st.empty() and (s[i] == ')' or s[i] == '}' or s[i] == ']'))
{
return false; // if start with closed paranthesis
}
else if (s[i] == '(' or s[i] == '{' or s[i] == '[')
{
st.push(s[i]);
}
else if (s[i] == ')')
{
if (!st.empty() and st.top() == '(')
{
st.pop();
}
else
{
ans = false;
break;
}
}
else if (s[i] == '}')
{
if (!st.empty() and st.top() == '{')
{
st.pop();
}
else
{
ans = false;
break;
}
}
else if (s[i] == ']')
{
if (!st.empty() and st.top() == '[')
{
st.pop();
}
else
{
ans = false;
break;
}
}
}
if (!st.empty())
{
return false;
}
return ans;
}
int main()
{
string s = "{[(((())))]}";
if (isValid(s))
{
cout << "Valid!" << endl;
}
else
{
cout << "Not valid!" << endl;
}
return 0;
}