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<?php $A = [1, -2, 5, -9, 9]; $X = -9; $s = solution($A, $X); var_dump($s, array_search($X, $A)); function solution($A, $X) { $N = sizeof($A); if ($N == 0) { return -1; } $l = 0; $r = $N - 1; while ($l < $r && $X !== $A[$l] ) { $m = (int)(($l + $r) / 2); if ($A[$m] > $X) { $r = $m; } else { $l = $m; } } if ($A[$l] == $X) { return $l; } else return -1; }
Output for git.master, git.master_jit, rfc.property-hooks
int(-1) int(3)

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