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  • web development basics

    Web development Interpolation: whenever you need to communicate properti...

  • ubuntu freeze

    If it locks up completely, you can REISUB it, which is a safer alternati...

  • 378 Kth Smallest Element in a Sorted Matrix

    378 Kth Smallest Element in a Sorted Matrix Given a n x n matrix where e...

  • A trick to solve most "substring" problem

    I will first give the solution then show you the magic template. The cod...

  • Bit Manipulation

    Wiki Bit manipulation is the act of algorithmically manipulating bits or...

  • DP unique BST trees

    The problem can be solved in a dynamic programming way. I’ll explain the...

  • Longest Substring with At Least K Repeating Characters

    First, we consider the situation that only one kind of char satisfies th...

  • Design compressed string iterator

    Design and implement a data structure for a compressed string iterator. ...