Tips

Min and Max value

int: Integer.MAX_VALUE ($2^{31} - 1$), Integer.MIN_VALUE ($-2^{31}$)

Data structure

Stack

Deque<Integer> stack = new LinkedList<Integer>();

stack.isEmpty() 
stack.peekFirst()
stack.pollFirst();
stack.offerFirst(1);

String

StringBuilder cur = new StringBuilder();
cur.append('(');
cur.deleteCharAt(cur.length() - 1); // remove last char from the string
String result = cur.toString();

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Last update: September 8, 2020