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  1. Prepare
  2. Data Structures
  3. Arrays
  4. Array Manipulation
  5. Discussions

Array Manipulation

  • kirilangov
     + 1 comment

    I think a little cleaner PHP solution:

    <?php

fscanf(STDIN, '%d %d', $n, $m);

$list = [];
for ($i = 0; $i < $m; $i++) {
    list($a, $b, $k) = explode(' ', trim(fgets(STDIN)), 3);

    $list[$a-1] = ($list[$a-1] ?? 0) + $k;
    $list[$b] = ($list[$b] ?? 0) - $k;
}

ksort($list);

$running_total = 0;
$max = 0;
foreach ($list as $value) {
    $running_total += $value;
    $max = max($max, $running_total);
}

print $max;