Slow code? 😩 You’re not alone—it's a common challenge for beginners! This guide dives into 7️⃣ frequent performance pitfalls and how to fix them 💡 to make your code zippy and efficient 🚀.

👀 What’s covered:
🪵 Too much logging
🔁 Inefficient loops
🗃 Bad database queries
🧠 Misunderstanding hardware
🧹 Poor memory management
🧮 Sluggish array traversal
📋 Unnecessary data copying

Packed with practical examples ✍️ and tips 🛠, this guide helps you write faster, smarter code and shows why profiling 📊 and smart data structures 🧱 matter.
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Sooo recently I decided to level up my home WiFi — not by buying something new, but by reviving an ancient D-Link DSL-124 router we had lying around. 💀
(Throwback to when we used to have copper-wired internet 😂)

Now we’re rocking fiber optic from Ethio Telecom with a ZTE router, and I thought: "Why not make this dusty D-Link useful again?"

First attempt?
I plugged the D-Link into the ZTE router using an RJ11 cable (the little phone cable) and prayed for magic. ✨
Spoiler: It flopped. ❌ Turns out RJ11 is for phone signals, not internet between routers. Rookie mistake lol.

So I wiped the D-Link (full reset 🔥), set it up properly over Ethernet, disabled DHCP, and basically turned it into a simple WiFi extender.
AND GUESS WHAT — it worked!
My PC connected to the D-Link WiFi and was surfing the web like a champ. 🖥🌍

Butttt plot twist:
My phone was NOT vibing. 🥲 It connected to the D-Link WiFi, but no internet. Meanwhile, my PC was chillin’.

Since I had MAC address filtering (whitelisting) enabled on the ZTE router for extra security 🔒, I thought that was the issue.
I had already whitelisted both my PC and my phone.
I even added the D-Link router’s MAC address too, thinking it would let everyone behind it through.

Still nothing. 😤

After some serious brain workout 🧠, I figured it out:
Phones sometimes use randomized MAC addresses when connecting to WiFi to be more "private."
Which means the ZTE router didn’t recognize my phone — even though I whitelisted it.

Fixed it by turning OFF random MAC for the D-Link WiFi on my phone and using the real MAC address.
Reconnected... and BOOM — full internet access. 📱✅

Now both my PC and my phone are living their best WiFi lives through the D-Link router. 🎉

Honestly?
This mini project taught me so much — not just about routers and cables, but also about MAC filtering, DHCP, network behavior, and how old tech can still be crazy useful if you know how to mess with it.
Moral of the story:
Sometimes, the problems you face are exactly what push you to level up.
They’re not the enemy — they’re the reason you grow. 🌱
🔧📶💡

List<int> list = new List<int> { 5, 3, 8, 1 };
Dictionary<int, int> priority = new Dictionary<int, int>
{
    { 5, 1 },
    { 3, 2 },
    { 8, 3 },
    { 1, 4 }
};

list.Sort((a, b) => priority[a].CompareTo(priority[b]));
Console.WriteLine(string.Join(", ", list));

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Use your coding superpowers 💪 in fresh ways that match your strengths & passion! 💼🚀

let a = [1, 2, 3];
a[10] = 99;

console.log(a.length);
console.log(a.hasOwnProperty(5));
console.log(Object.keys(a));

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#include <iostream>
using namespace std;

int main(){
   char ch[][20]={"Argentina","Korea","Greece","Nigeria"};
cout<<*(*(ch+2)+1));

}