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Java JVM

Posted on September 9, 2018

JVM is a engine that provides runtime environment to drive the Java Code or applications. It converts Java bytecode into machines language. JVM is a part of JRE (Java Run Environment). It stands for Java Virtual Machine. [Read More]

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Java

Java GC

Posted on September 9, 2018

In C/C++, programmer is responsible for both creation and destruction of objects. Usually programmer neglects destruction of useless objects. Due to this negligence, at certain point, for creation of new objects, sufficient memory may not be available and entire program will terminate abnormally causing OutOfMemoryErrors. But in Java, the programmer... [Read More]

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Java

Leetcode 404: Sum of Left Leaves

Posted on September 8, 2018

Question Find the sum of all left leaves in a given binary tree. [Read More]

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Leetcode

Leetcode 400: Nth Digit

Posted on September 8, 2018

Question Find the nth digit of the infinite integer sequence 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, … [Read More]

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Leetcode

Python Notes: Closures

Posted on September 8, 2018

You can build dynamic functions with a nested function by passing different parameters into it. This technique of using the values of outside parameters within a dynamic function is called closures. For example, [Read More]

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Python

Python Notes: Variable Visibility

Posted on September 8, 2018

Global Variable In Python, a variable declared outside of the function or in global scope is known as global variable. This means, global variable can be accessed (read) inside or outside of the function. [Read More]

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Python

Python Notes: Decorators

Posted on September 7, 2018

Decorator can add additional functionality to existing functions. It takes a function and returns a new function: [Read More]

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Python

Python Notes: HTTP Requests

Posted on September 7, 2018

Simple HTTP Request For really simple HTTP client code, using the built-in urllib module is usually fine. [Read More]

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Python

Leetcode 399: Evaluate Division

Posted on September 4, 2018

Question Equations are given in the format A / B = k, where A and B are variables represented as strings, and k is a real number (floating point number). Given some queries, return the answers. If the answer does not exist, return -1.0. [Read More]

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Leetcode

Leetcode 398: Random Pick Index

Posted on September 4, 2018

Question Given an array of integers with possible duplicates, randomly output the index of a given target number. You can assume that the given target number must exist in the array. [Read More]

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Leetcode 397: Integer Replacement

Posted on September 4, 2018

Question Given a positive integer n and you can do operations as follow: [Read More]

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Leetcode

Leetcode 396: Rotate Function

Posted on September 4, 2018

Question Given an array of integers A and let n to be its length. [Read More]

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Leetcode

Leetcode 395: Longest Substring with At Least K Repeating Characters

Posted on September 3, 2018

Question Find the length of the longest substring T of a given string (consists of lowercase letters only) such that every character in T appears no less than k times. [Read More]

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Leetcode

Leetcode 394: Decode String

Posted on September 3, 2018

Question Given an encoded string, return it’s decoded string. [Read More]

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Leetcode

Java Operator Precedence

Posted on September 3, 2018

postfix _expr_++ _expr_-- unary ++_expr_ --_expr_ +_expr_ -_expr_ ~ ! multiplicative * / % additive + - shift << >> >>> relational < > <= >= instanceof equality == != bitwise AND & bitwise exclusive OR ^ bitwise inclusive OR | logical AND && logical OR || ternary ? :... [Read More]

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Java