Add Two Numbers With Bit Operation
Question： Calculate the sum of two integers a and b, but you are not allowed to use the operator + and -. Example: Given a = 1 and »
xor operation practice
Code snippet without using xor operation, if ((dividend > 0 && divisor > 0) || (dividend < 0 && divisor < 0)) return ret; else »
Be careful on contains() method
It is very important to understand how to use contains() method in Map/Set, otherwise unexpected result you may get. A common mistake You will not »
Three Sum O(n^2) Solution
It takes a while to figure out the solution on O(n^2) with no extra spaces. The idea is that loop the array to make »