Traffic Light Simulation
Hard
PHP
PHP Control Flow
23 views
Problem Statement
Colors cycle: Red -> Green -> Yellow -> Red. Given start color and t steps, print final color.
Input Format
One line: startColor t.
Output Format
One word color.
Example
Red 4
Green
Constraints
0
Input / Output Format
Input Format
One line: startColor t.
Output Format
One word color.
Constraints
0
Examples
Input:
Red 4
Output:
Green
Example Solution (Public)
<?php
$inputText=trim(stream_get_contents(STDIN));
if($inputText==='') exit;
[$start,$t]=preg_split('/\\s+/', $inputText, 2);
$t=intval($t);
$colors=['Red','Green','Yellow'];
$idx=array_search($start,$colors,true);
if($idx===false) $idx=0;
$idx=($idx + ($t%3))%3;
echo $colors[$idx];
?>
Official Solution Code
<?php
$inputText=trim(stream_get_contents(STDIN));
if($inputText==='') exit;
[$start,$t]=preg_split('/\\s+/', $inputText, 2);
$t=intval($t);
$colors=['Red','Green','Yellow'];
$idx=array_search($start,$colors,true);
if($idx===false) $idx=0;
$idx=($idx + ($t%3))%3;
echo $colors[$idx];
?>
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