square brackets coding questions code example

Example 1: bracket balancing c++

/*
PARENTHESE MATCHING
AUTHOR: UTKARSH SINHA
*/
bool correct_paranthesis(string str){
	stack<char> stk;
	map<char,char> bracket_map;
	bracket_map[')'] = '(';
	bracket_map['}'] = '{';
	bracket_map[']'] = '[';
	
	for(int i=0; i<str.size(); i++){
		if(str[i] == '(' || str[i] == '{' || str[i] == '[')
			stk.push(str[i]);
		if(str[i] == ')' || str[i] == '}' || str[i] == ']'){
			if(stk.empty())
				return false;
			if(stk.top() == bracket_map[str[i]] )
				stk.pop();
		}
	}
	
	return (stk.empty() == true);
}

Example 2: bracket balance java

// for Java

class Parser{
    static HashMap<Character,Character> bracket_map = new HashMap<>();

    static {
        bracket_map.put(')', '(');
        bracket_map.put('}','{');
        bracket_map.put(']','[');
    }
    
    boolean isBalanced(String s){
            
        Stack<Character> stack = new Stack<>();
        char temp;
        for (int i = 0; i < s.length(); i++) {
            temp = s.charAt(i);
            if(temp == '{' || temp == '[' || temp == '('){
                stack.push(temp);
            }else {
                if(stack.isEmpty() || stack.peek() != bracket_map.get(temp)) return false;
                stack.pop();
            }
        }
        return stack.isEmpty();
    }
}