Parenthesis Problems

checking Parenthesis Validity

caution

• starting the balance with 0
• for every ( ++balance
• for every ) --balance
• To Note here: whenever my balance has more ) than (, then I would have --balance more times, Hence, the balance < 0, thus false
• Also to note at the very end I should get equal no. of ++balance & --balance, Hence MUST have balance == 0 else false

int balance = 0;
for (auto &el : s)
{
    if (el == '(')
        ++balance;
    else    // (el == ')')
        --balance;

    if (balance < 0)
        return false;
}
return (balance == 0);