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俄罗斯乘法

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2016-05-26 08:19:331162browse

俄罗斯乘法

<?php
function russian($m, $n, $res = 0){
	(1 == ($n & 1)) && $res += $m;
	$m = $m << 1;
	$n = $n >> 1;
	return $n ? russian($m, $n, $res) : $res;
}

echo russian(7, 8);

                   

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