Alexander Shushunov AlexanderShushunov

## operationPerSecond.js
function operationPerSecond () {
  let lastNotifyTime = Date.now()
  let operationCount = 0
  return () => {
    operationCount++
    if (Date.now() - lastNotifyTime > 1000) {
      console.log('opp per sec:', operationCount)
      operationCount = 0
      lastNotifyTime = Date.now()
    }

## margin-collapsing.html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .block {
            height: 20px;
            border: 1px solid;
        }

## most-frequent-letter.js
const _ = require('lodash');

let result = _("qwerwererrr")
    .groupBy()
    .map((value, key) => ({key, length: value.length}))
    .maxBy(_ => _.length)
    .key;

console.log(result);

## MatrixUtils.java
import java.util.Arrays;

public class MatrixUtils {
    public static int[][] multiplyMatrix(
            int[][] left,
            int[][] right) {
        if (!checkMatrix(left) || !checkMatrix(right)) {
            throw new IllegalArgumentException();
        }
        if (getColumnCount(left) != getRowCount(right)) {
	function operationPerSecond () {
	let lastNotifyTime = Date.now()
	let operationCount = 0
	return () => {
	operationCount++
	if (Date.now() - lastNotifyTime > 1000) {
	console.log('opp per sec:', operationCount)
	operationCount = 0
	lastNotifyTime = Date.now()
	}
	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8">
	<title>Title</title>
	<style>
	.block {
	height: 20px;
	border: 1px solid;
	}
	const _ = require('lodash');

	let result = _("qwerwererrr")
	.groupBy()
	.map((value, key) => ({key, length: value.length}))
	.maxBy(_ => _.length)
	.key;

	console.log(result);
	import java.util.Arrays;

	public class MatrixUtils {
	public static int[][] multiplyMatrix(
	int[][] left,
	int[][] right) {
	if (!checkMatrix(left) \|\| !checkMatrix(right)) {
	throw new IllegalArgumentException();
	}
	if (getColumnCount(left) != getRowCount(right)) {