## Count 1 in Binary

Count how many 1 in binary representation of a 32-bit integer.

## Merge Intervals

Given a collection of intervals, merge all overlapping intervals.

## Partition Array by Odd and Even

Partition an integers array into odd number first and even number second.

## Longest Increasing Continuous Subsequence

Give an integer array，find the longest increasing continuous subsequence in this array.

## Count and Say

The count-and-say sequence is the sequence of integers beginning as follows:

## Length of Last Word

Given a string s consists of upper/lower-case alphabets and empty space characters `' '`, return the length of last word in the string.

## Valid Parentheses

Given a string containing just the characters `'('`, `')'`, `'{'`, `'}'`, `'['` and `']'`, determine if the input string is valid.

## Space Replacement

Write a method to replace all spaces in a string with %20. The string is given in a characters array, you can assume it has enough space for replacement and you are given the true length of the string.

## Tower of Hanoi Recursive Algorithm ## Number of Islands

Given a boolean 2D matrix, find the number of islands.