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Create 0003_longest_substring_without_repeating_character #3

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24 changes: 24 additions & 0 deletions python_solutions/0003_longest_substring_without_repeating_character
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//using sliding window

import java.util.HashSet;
import java.util.Set;

class Solution {
public int lengthOfLongestSubstring(String s) {
// HashSet to store the current window of unique characters
Set<Character> set = new HashSet<>();
int n = s.length();
int ans = 0, i = 0, j = 0;
while (i < n && j < n) {
// try to extend the range [i, j]
if (!set.contains(s.charAt(j))){
set.add(s.charAt(j++));
ans = Math.max(ans, j - i);
}
else {
set.remove(s.charAt(i++));
}
}
return ans;
}
}