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<?php $a = [ -7, 1, 5, 2, -4, 2, 1 ]; for($i=count($a)-1,$c=0;$i+1&&$c!=(array_sum($a)-$a[$i])/2;$c+=$a[$i--]);echo $i;
Output for git.master, git.master_jit, rfc.property-hooks
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