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twoSum.php
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121 lines (112 loc) · 2.74 KB
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<?php
/**
* 双循环嵌套
* @param Integer[] $nums
* @param Integer $target
* @return Integer[]
*/
function twoSum1($nums, $target) {
$length = count($nums);
for ($i = 0; $i < $length; $i++) {
for ($j = $i + 1; $j < $length; $j++) {
if($nums[$i] + $nums[$j] == $target){
return [$i, $j];
}
}
}
return [];
}
function twoSum2($nums, $target) {
$length = count($nums);
for ($i = 0; $i < $length; $i++) {
for ($j = $i + 1; $j < $length; $j++) {
if($nums[$i] + $nums[$j] == $target) {
return [$i, $j];
}
}
}
return [];
}
function twoSum3($nums, $target) {
for ($i = 0; $i < count($nums); $i++) {
for ($j = $i + 1; $j < count($nums); $j++) {
if($nums[$i] + $nums[$j] == $target) {
return [$i, $j];
}
}
}
return [];
}
function twoSum4($nums, $target) {
$length = count($nums);
for ($i = 0; $i < $length; $i++) {
for ($j = $i + 1; $j < $length; $j++) {
if($nums[$i] + $nums[$j] == $target) {
return [$i, $j];
}
}
}
return [];
}
function twoSum5($nums, $target) {
$l = count($nums);
for ($i = 0; $i < $l; $i++) {
for ($j = $i + 1; $j < $l; $j++) {
if($nums[$j] + $nums[$i] == $target) {
return [$i, $j];
}
}
}
return [];
}
// hashMap
function twoSum6($nums, $target) {
$hashMap = [];
foreach ($nums as $key => $value) {
if(isset($hashMap[$target - $value])) {
return [$hashMap[$target - $value], $key];
}
$hashMap[$value] = $key;
}
return [];
}
function twoSum7($nums, $target) {
$hashMap = [];
foreach ($nums as $key => $value) {
if(isset($hashMap[$target - $value])) {
return [$hashMap[$target - $value], $key];
}
$hashMap[$value] = $key;
}
return [];
}
function twoSum8($nums, $target) {
$hashMap = [];
foreach ($nums as $key => $value) {
if(isset($hashMap[$target - $value])) {
return [$hashMap[$target - $value], $key];
}
$hashMap[$value] = $key;
}
return [];
}
function twoSum9($nums, $target) {
$hashMap = [];
foreach ($nums as $key => $value) {
if(isset($hashMap[$target - $value])) {
return [$hashMap[$target - $value], $key];
}
$hashMap[$value] = $key;
}
return [];
}
function twoSum($nums, $target) {
$hashMap = [];
foreach ($nums as $key => $value) {
if(isset($hashMap[$target - $value])) {
return [$hashMap[$target - $value], $key];
}
$hashMap[$value] = $key;
}
return [];
}