alexmaryin

#include <list>
#include <cassert>
#include <iostream>
#include <chrono>

std::list<int>* sieveEratosphen(const int n)
{
    assert(n > 2);
    bool *numbers{new bool[n]};
    for (int i = 0; i < n; i++) { numbers[i] = true; }

alexmaryin

import time


def measured_time(func):
    def wrapped(*args):
        start = time.perf_counter_ns()
        result = func(*args)
        elapsed = int((time.perf_counter_ns() - start) / 1000000)
        print(f'Elapsed time is {elapsed} ms')
        return result

alexmaryin

import kotlin.system.measureTimeMillis

fun sieveEratosphen(n: Int): List<Int> {
    require(n > 2)
    val numbers = Array(n) { true }
    var next = 2
    while (next * next <= n) {
        if (numbers[next]) {
            for (index in 0 until n - next) {
                val step = next * next + index * next

alexmaryin

// 1. In Common-level gradle file set source dir for assets to one folder both for desktop and android modules

sourceSets {
        named("commonMain") {
            resources.srcDirs("resources")
            // ...
        }
    }
android { //...
    sourceSets { //...

alexmaryin

val shakeInterpolator = TimeInterpolator { delta ->
    val freq = 6f
    val decay = 2f
    (sin(freq * delta * Math.PI) * exp((-delta * decay).toDouble())).toFloat()
}

fun RecyclerView.addItemShaker(position: Int) {

    val shaker = object : RecyclerView.OnScrollListener() {
        override fun onScrollStateChanged(recyclerView: RecyclerView, newState: Int) {

alexmaryin

// BaseAdapter -> inner class DataViewHolder -> method bind
fun bind(item: Any, clickListener: AdapterClickListenerById) {
    holder.bind(binding, item, clickListener)
    binding.root.animation = AnimationUtils.loadAnimation(binding.root.context, R.anim.recycler_item_arrive)
}

// Animation file in resources
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate

alexmaryin

// On ViewModel we need to return position to scroll. Good practice is delegate it to responsible class:
fun getScrollPosition(items: List<Any>) = currentScreen.getPositionToScroll(items)

// On Fragment we need to observe event of scroll triggering:
viewModel.getScrollTrigger().collectOnFragment(this) { state ->
when (state) {
    false -> {} // Other actions if scrolling is not available, i.e. show a SnackBar
    true -> {
        viewModel.getScrollPosition(referenceList)?.let { (position, snackText) ->
            binding.recyclerView.addItemShaker(position)

alexmaryin

// Game Events

sealed class GameEvent

class GameOver(val score: Int) : GameEvent()
class CopCatchEnemy(val cop: Entity, val enemy: Entity) : GameEvent()
class PlayerRestoresCop(val cop: Entity) : GameEvent()
object EnemyMissed : GameEvent()
object EnemyCaught : GameEvent()
object CopMissed : GameEvent()

alexmaryin

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View {
        // ...
        requireActivity().onBackPressedDispatcher.addCallback(viewLifecycleOwner, backPressHandler)
        // ...
    }

alexmaryin

private var backPressedTime: Long = 0
private val backPressHandler = object : OnBackPressedCallback(true) {
    override fun handleOnBackPressed() {
        if (mainViewModel.currentScreen is MainScreen) {
            if (backPressedTime + 2000 > System.currentTimeMillis()) {
                activity?.finishAndRemoveTask()
            } else {
                Toast.makeText(requireContext(), "Press again to exit", Toast.LENGTH_SHORT).show()
                backPressedTime = System.currentTimeMillis()
            }