用 PHP和Golang 来刷leetCode 之 无重复字符 最长子串

class Solution {
    /**
     * @param String $s
     * @return Integer
     */
    function lengthOfLongestSubstring($s) {
        if (strlen($s)==0) return 0;
        $map = [];
        $max = 0;
        $left = 0;
        for($i = 0; $i < strlen($s); $i++){
            if(array_key_exists($s[$i],$map)){
                $left = max($left, $map[$s[$i]] + 1);
            }
            $map[$s[$i]] = $i;
            $max = max($max,$i-$left+1);
        }
        return $max;
    }
}

$str = "";
function lengthOfLongestSubstring($s) {
    $strlen = strlen($s);
    if($strlen<=1){
        return $strlen;
    }
    $subStrlen = [];

    for($i=0;$i<$strlen;$i++){
        $subStrArr = [];
        $subStrArr[] = $s[$i];
        for($j=$i+1;$j<$strlen;$j++){
            $subStrArr[] = $s[$j];
            if(count(array_unique($subStrArr))!=count($subStrArr)){
                array_pop($subStrArr);
                break;
            }

        }
        $subStrlen = count($subStrArr)>count($subStrlen)?$subStrArr:$subStrlen;
    }
    return count($subStrlen);
}
$a = lengthOfLongestSubstring($str);
print_r($a)

function lengthOfLongestSubstring($s) {
        $len = strlen($s);
        if ($len < 2){
            return $len;
        }
        $win = [];
        $res_len = 0;
        $i = 0;
        $j = 0;
        while ($i<$len && $j<$len){
            if(!in_array($s[$i],$win)){
                $win[]= $s[$i++];
                $res_len = max($res_len,$i-$j);

            }else{
                $j++;
                array_shift($win);
            }
        }
        return $res_len;
    }

  function lengthOfLongestSubstring($s)
{
        $len = strlen($s);
        $j = 0;
        $i = 0;
        $maxStrLen = 0;
        $set = [];
        while ($j<$len){
            if(array_key_exists($s[$j],$set)){
                $i = max($i,$set[$s[$j]]);

            }
            $maxStrLen = max($maxStrLen,$j-$i+1);
            $set[$s[$j]]=$j+1;
            $j++;
        }
        return $maxStrLen;
    }

package main

import "fmt"
//最长不含有重复字符的子串
func lenthOfNonRepeatingSubstr(s string) int {
  lastOccurred := make(map[byte]int)
  start := 0
  maxLength := 0
  for i, ch := range []byte(s) {
    if lastI, ok := lastOccurred[ch]; ok && lastI >= start {
      start = lastI + 1
    }
    if i-start+1 > maxLength {
      maxLength = i - start + 1
    }
    lastOccurred[ch] = i
  }
  return maxLength
}

func main() {
  fmt.Println(lenthOfNonRepeatingSubstr("abcabcbb")) //3
  fmt.Println(lenthOfNonRepeatingSubstr("bbbbb"))    //1
  fmt.Println(lenthOfNonRepeatingSubstr("pwwkew"))   //3
}