PHP Program to Minimum in Matrix with Explanation
PHP
Medium
PHP Control Flow
21 views
1 min read
93 words
This problem helps you practice core PHP fundamentals in a practical way. It builds intuition around minimum, matrix, first. Let’s break it down step by step so you can implement it confidently.
Problem Statement
Given r and c and the matrix values, print the minimum value.
Input Format
First r c. Next r*c integers.
Output Format
One integer minimum.
Constraints
r*c
Code Solution
This explanation is written for learning purposes and to help beginners understand the concept clearly.
<?php
$inputText=trim(stream_get_contents(STDIN));
if($inputText==='') exit;
$tokens=preg_split('/\\s+/', $inputText);
$i=0;
$r=intval($tokens[$i++] ?? 0);
$c=intval($tokens[$i++] ?? 0);
$mn=null;
for($k=0;$k<$r*$c;$k++){
$v=intval($tokens[$i++] ?? 0);
if($mn===null || $v<$mn) $mn=$v;
}
echo ($mn===null?0:$mn);
?>
Common Mistakes
- Misreading input/output format.
- Not handling constraints and edge cases.
- Off-by-one errors in loops.
- Forgetting to reset variables between test cases (if any).
Solution Guide
Problem
Given r and c and the matrix values, print the minimum value.
Input / Output
Input
First r c. Next r*c integers.
Output
One integer minimum.
Details
Common Mistakes
- Misreading input/output format.
- Not handling constraints and edge cases.
- Off-by-one errors in loops.
- Forgetting to reset variables between test cases (if any).
Official Solution
<?php
$inputText=trim(stream_get_contents(STDIN));
if($inputText==='') exit;
$tokens=preg_split('/\\s+/', $inputText);
$i=0;
$r=intval($tokens[$i++] ?? 0);
$c=intval($tokens[$i++] ?? 0);
$mn=null;
for($k=0;$k<$r*$c;$k++){
$v=intval($tokens[$i++] ?? 0);
if($mn===null || $v<$mn) $mn=$v;
}
echo ($mn===null?0:$mn);
?>
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