• Problem Solving
• Popular online problem solving platforms -
• BeeCrowd Online Judge
  • How we’ll solve the problems ?
  • Test in Online PHP Code -
  • Problem 1: Hello World
    • Problem Details
  • Solution in PHP
  • Problem 2: Extremely Basic
  • Solution in PHP
  • Problem 3 - Multiples
  • Solution in PHP
  • Problem 4 - Upto Odd Numbers
  • Solution in PHP

¶Problem Solving

Todays, lecture is totally different from PHP programming language aspects. This is for both PHP and all general level programming languages. Problem Solving is a very important parts to becoming a very good Developer. In our practical life, we’ll face lots of different and new problems every day when we starts our real project. If we have proper problem solving skills, then we can easily solve any problem easily. Let’s try solving some of the problems in popular online judge programming platform.

¶Popular online problem solving platforms -

1. BeeCrowd - https://www.beecrowd.com.br/judge/en
2. UVA Online Judge - https://onlinejudge.org
3. HackerRank Online Judge - https://www.hackerrank.com
4. CodeForce Online Judge - https://codeforces.com
5. LightOJ - https://lightoj.com

And there is so many online programming problem solving websites out there. We’ll start using the easiest one BeeCrowd or previously URI online judge.

¶BeeCrowd Online Judge

BeeCrowd is one of the most popular online judge problem solving platform. It’s suitable for both beginner, intermediate and advanced level users.

¶How we’ll solve the problems ?

We’ll read the problems very carefully and solve those problems using PHP language. You can try with other language also if you’re comfortable. We’ll solve some Beginner Level problems - https://www.beecrowd.com.br/judge/en/problems/index/1

¶Test in Online PHP Code -

https://onecompiler.com/php/3y5ak79p9

¶Problem 1: Hello World

https://www.beecrowd.com.br/judge/en/problems/view/1000

¶Problem Details

¶Solution in PHP

<?php

echo "Hello World!\n";

?>

¶Problem 2: Extremely Basic

https://www.beecrowd.com.br/judge/en/problems/view/1001

¶Solution in PHP

<?php

$input1 = intval(fgets(STDIN));
$input2 = intval(fgets(STDIN));
$summation = $input1 + $input2;

echo "X = $summation\n";

?>

¶Problem 3 - Multiples

https://www.beecrowd.com.br/judge/en/problems/view/1044

¶Solution in PHP

<?php

$numbers = fgets(STDIN);

$a = intval(explode(" ", $numbers)[0]);
$b = intval(explode(" ", $numbers)[1]);

if (($b % $a == 0) || ($a % $b == 0)) {
    echo "Sao Multiplos\n";
} else {
    echo "Nao sao Multiplos\n";
}

?>

¶Problem 4 - Upto Odd Numbers

https://www.beecrowd.com.br/judge/en/problems/view/1067

¶Solution in PHP

<?php

$x = intval(fgets(STDIN));

for($i = 1; $i <= $x; $i += 2) {
    echo $i . "\n";
}

?>