Submission #4060957

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Source Code Expand

<?php

// ABC109B
$w_array = array();
fscanf(STDIN, '%d', $n);
for ($i = 0; $i < $n; $i++) {
    fscanf(STDIN, '%s', $w);
    if (in_array($w, $w_array)) {
        echo 'No';
        return;
    }
    if (!empty($w_array)) {
        if (substr($w, 0, 1) !== substr($w_array[count($w_array) - 1], -1, 1)) {
            echo 'No';
            return;
        }
    }
    $w_array[] = $w;
}

echo 'Yes';

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