2019-09-11
Sep 11 In-Class Exercise Thread.
Post your solutions to the Sep 11 In-class Exercise to this Thread.
Best,
Chris
Post your solutions to the Sep 11 In-class Exercise to this Thread.
Best,
Chris
<?php
function binarySearch($t, $P, $low, $high, $current)
{
$a = $P[$t];
while($low <= $high) {
$m = ($low + $high)/2;
if($a[$m] == $current)
return $a[$m+1];
if($a[$m] < $current)
$low = $m + 1;
else
$high = $m - 1;
}
return $a[$low];
}
$t = "frog";
$P = [
"aadvark" => [1, 5, 9], "frog" => [1, 2, 3, 5, 25, 26, 27, 38, 50], "salamander" => [1 ,3, 14, 67]];
echo binarySearch($t, $P, 1, 4, 14);
(Edited: 2019-09-11) <?php
function binarySearch($t, $P, $low, $high, $current)
{
$a = $P[$t];
while($low <= $high) {
$m = ($low + $high)/2;
if($a[$m] == $current)
return $a[$m+1];
if($a[$m] < $current)
$low = $m + 1;
else
$high = $m - 1;
}
return $a[$low];
}
$t = "frog";
$P = [
"aadvark" => [1, 5, 9],
"frog" => [1, 2, 3, 5, 25, 26, 27, 38, 50],
"salamander" => [1 ,3, 14, 67]
];
echo binarySearch($t, $P, 1, 4, 14);
<?php
function binarySearch($t, $P, $low, $high, $current) {
while($high - $low > 1) {
$mid = (int)($high+$low) / 2;
if($P[$t][$mid] < $current)
return binarySearch($t,$P,$mid,$high,$current);
else
return binarySearch($t,$P,$low,$mid,$current);
}
if($high - $low == 1) {
if($P[$t][$low] <= $current && $P[$t][$high] > $current)
return $P[$t][$high];
}
}
$t = "frog";
$P = [
"aadvark" => [1, 5, 9], "frog" => [1, 2, 3, 5, 25, 26, 27, 38, 50], "salamander" => [1 ,3, 14, 67]]; echo binarySearch($t, $P, 1, 4, 14);
<?php
function binarySearch($t, $P, $low, $high, $current) {
while($high - $low > 1) {
$mid = (int)($high+$low) / 2;
if($P[$t][$mid] < $current)
return binarySearch($t,$P,$mid,$high,$current);
else
return binarySearch($t,$P,$low,$mid,$current);
}
if($high - $low == 1) {
if($P[$t][$low] <= $current && $P[$t][$high] > $current)
return $P[$t][$high];
}
}
$t = "frog";
$P = [
"aadvark" => [1, 5, 9],
"frog" => [1, 2, 3, 5, 25, 26, 27, 38, 50],
"salamander" => [1 ,3, 14, 67]
];
echo binarySearch($t, $P, 1, 4, 14);
<?php
function binarysearch($t,$P,$low,$high,$current){
$arr = $P[$t];
if ($high < $low)
return false;
while($low<=$high){
$mid = floor(($high + $low)/2);
if ($arr[$mid] == $current)
$low=$mid+1;
elseif ($arr[$mid] > $current) {
$high=$mid-1;
}
else {
$low=$mid+1;
}
}
return $arr[$low];
}
$t = "frog";
$P = [
"aadvark" => [1, 5, 9], "frog" => [1, 2, 3, 5, 25, 26, 27, 38, 50], "salamander" => [1 ,3, 14, 67]]; echo binarySearch($t, $P, 1, 4, 14);
<?php
function binarysearch($t,$P,$low,$high,$current){
$arr = $P[$t];
if ($high < $low)
return false;
while($low<=$high){
$mid = floor(($high + $low)/2);
if ($arr[$mid] == $current)
$low=$mid+1;
elseif ($arr[$mid] > $current) {
$high=$mid-1;
}
else {
$low=$mid+1;
}
}
return $arr[$low];
}
$t = "frog";
$P = [
"aadvark" => [1, 5, 9],
"frog" => [1, 2, 3, 5, 25, 26, 27, 38, 50],
"salamander" => [1 ,3, 14, 67]
];
echo binarySearch($t, $P, 1, 4, 14);
<?php
function binarySearch($t, $P, $low, $high, $current){
$mid = $low + ($high-$low)/2;
if($low<=$high){
if($P[$t][$low] > $current){
return $P[$t][$low];
}
else if($P[$t][$mid] <= $current){
binarySearch($t,$P,$mid + 1, $high, $current);
}
}
return $P[$t][$high];
}
$t = "frog";
$P=["aadvark" => [1, 5, 9],
(Edited: 2019-09-11)
"frog" => [1,2,3,5,25,26,2,38,50],
"salamander" => [1,3,14,6]
];
echo binarySearch($t, $P, 1, 4, 14);
?>
<?php
function binarySearch($t, $P, $low, $high, $current){
$mid = $low + ($high-$low)/2;
if($low<=$high){
if($P[$t][$low] > $current){
return $P[$t][$low];
}
else if($P[$t][$mid] <= $current){
binarySearch($t,$P,$mid + 1, $high, $current);
}
}
return $P[$t][$high];
}
$t = "frog";
$P=["aadvark" => [1, 5, 9],
"frog" => [1,2,3,5,25,26,2,38,50],
"salamander" => [1,3,14,6]
];
echo binarySearch($t, $P, 1, 4, 14);
?>
function binarySearch($t, $P, $low, $high, $current){
if($P[$t][$low] > $current){
return $P[$t][$low];
}
while($low <= $high){
$mid = ($low + $high)/2;
if($P[$t][$mid] == $current){
return $P[$t][$mid + 1];
}elseif($current < $P[$t][$mid]){
$high = $mid - 1;
}else{
$low = $mid + 1;
}
}
return $P[$t][floor($high)];
}
$t = "frog";
$P = [
(Edited: 2019-09-11) "aadvark" => [1, 5, 9], "frog" => [1, 2, 3, 5, 25, 26, 27, 38, 50], "salamander" => [1 ,3, 14, 67] ];echo binarySearch($t, $P, 1, 4, 14);
function binarySearch($t, $P, $low, $high, $current){
if($P[$t][$low] > $current){
return $P[$t][$low];
}
while($low <= $high){
$mid = ($low + $high)/2;
if($P[$t][$mid] == $current){
return $P[$t][$mid + 1];
}elseif($current < $P[$t][$mid]){
$high = $mid - 1;
}else{
$low = $mid + 1;
}
}
return $P[$t][floor($high)];
}
$t = "frog";
$P = [
"aadvark" => [1, 5, 9],
"frog" => [1, 2, 3, 5, 25, 26, 27, 38, 50],
"salamander" => [1 ,3, 14, 67]
];
echo binarySearch($t, $P, 1, 4, 14);
<?php
function binarySearch($t, $P, $low, $high, $current){
if($high>=$low){
$mid=$low + floor(($high-$low)/2);
if($P[$t][$mid]==$current && $mid<count($P[$t])){
return $P[$t][$mid];
}
else if ($high-$low==1){
return ($P[$t][$high]);
}
else if ($P[$t][$mid]>$current){
return binarysearch($t,$P,$low,$mid-1,$current);
}
else if ($P[$t][$mid]<$current){
return binarysearch($t,$P,$mid+1,$high,$current);
}
}
}
$t = "salamander"; $P = [ "aadvark" => [1, 5, 9], "frog" => [1, 2, 3, 5, 25, 26, 27, 38, 50], "salamander" => [1 ,4, 14, 67] ]; echo binarySearch($t, $P, 1,2,9); ?>(Edited: 2019-09-11)
<?php
function binarySearch($t, $P, $low, $high, $current){
if($high>=$low){
$mid=$low + floor(($high-$low)/2);
if($P[$t][$mid]==$current && $mid<count($P[$t])){
return $P[$t][$mid];
}
else if ($high-$low==1){
return ($P[$t][$high]);
}
else if ($P[$t][$mid]>$current){
return binarysearch($t,$P,$low,$mid-1,$current);
}
else if ($P[$t][$mid]<$current){
return binarysearch($t,$P,$mid+1,$high,$current);
}
}
}
$t = "salamander";
$P = [
"aadvark" => [1, 5, 9],
"frog" => [1, 2, 3, 5, 25, 26, 27, 38, 50],
"salamander" => [1 ,4, 14, 67]
];
echo binarySearch($t, $P, 1,2,9);
?>
<?php
function binarySearch($t, $P, $low, $high, $current) {
if (count($P) === 0) return false;
$a = $P[$t]; $low = $low - 1;
while ($low <= $high)
{
$mid = floor(($low + $high) / 2);
if($a[$mid] == $current)
{
return true;
}
if($current < $a[$mid])
{
$high = $mid -1;
}
else
{
$low = $mid + 1;
}
}
return $a[$low];
}
$t = "frog";
$P = ["aadvark" => [1, 5, 9], "frog" => [1, 2, 3, 5, 25, 26, 27, 38, 50], "salamander" => [1, 3, 14, 67]];
echo binarySearch($t, $P, 1, 4, 14);
echo " ";
?>
<?php
function binarySearch($t, $P, $low, $high, $current) {
if (count($P) === 0) return false;
$a = $P[$t];
$low = $low - 1;
while ($low <= $high)
{
$mid = floor(($low + $high) / 2);
if($a[$mid] == $current)
{
return true;
}
if($current < $a[$mid])
{
$high = $mid -1;
}
else
{
$low = $mid + 1;
}
}
return $a[$low];
}
$t = "frog";
$P = ["aadvark" => [1, 5, 9], "frog" => [1, 2, 3, 5, 25, 26, 27, 38, 50], "salamander" => [1, 3, 14, 67]];
echo binarySearch($t, $P, 1, 4, 14);
echo " ";
?>
function binarySearch($t, $P, $low, $high, $current)
{
$array = $P[$t];
return binarySearchHelper($array, $low, $high, $current);
}
function binarySearchHelper($arr, $low, $high, $current)
{
if($current>$arr[$high])
{
return -1;
}
if($high<$low)
{
return -1;
}
if($current < $arr[$low])
{
return $arr[$low];
}
if($low == $high)
{
return $arr[high];
}
else
{
$mid = (($high - $low + 1) / 2);
if ($arr[$mid] < $current)
return binarySearchHelper($arr, $mid + 1, $high, $current);
else
return binarySearchHelper($arr, $low, $mid, $current);
}
}
echo(binarySearch($t, $P, $low, $high, $current))
function binarySearch($t, $P, $low, $high, $current)
{
$array = $P[$t];
return binarySearchHelper($array, $low, $high, $current);
}
function binarySearchHelper($arr, $low, $high, $current)
{
if($current>$arr[$high])
{
return -1;
}
if($high<$low)
{
return -1;
}
if($current < $arr[$low])
{
return $arr[$low];
}
if($low == $high)
{
return $arr[high];
}
else
{
$mid = (($high - $low + 1) / 2);
if ($arr[$mid] < $current)
return binarySearchHelper($arr, $mid + 1, $high, $current);
else
return binarySearchHelper($arr, $low, $mid, $current);
}
}
echo(binarySearch($t, $P, $low, $high, $current))
function binarySearch($t, $P, $low, $high, $current)
{
if($P[$t][$low] > $current){
return $P[$t][$low];
}else if($P[$t][$high] <= $current){
return -1;
}
while ($low < $high) {
$mid = floor(($low + $high) / 2);
if($P[$t][$mid] == $current) {
return $P[$t][$mid+1];
}elseif ($P[$t][$mid] > $current) {
if($P[$t][$mid-1] <= $current){
$high = $mid;
}else {
$high = $mid - 1;
}
}else {
$low = $mid + 1 ;
}
}
return $P[$t][$high];
}
function binarySearch($t, $P, $low, $high, $current)
{
if($P[$t][$low] > $current){
return $P[$t][$low];
}else if($P[$t][$high] <= $current){
return -1;
}
while ($low < $high) {
$mid = floor(($low + $high) / 2);
if($P[$t][$mid] == $current) {
return $P[$t][$mid+1];
}elseif ($P[$t][$mid] > $current) {
if($P[$t][$mid-1] <= $current){
$high = $mid;
}else {
$high = $mid - 1;
}
}else {
$low = $mid + 1 ;
}
}
return $P[$t][$high];
}
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