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392. Is Subsequence
Given a string s and a string t, check if s is subsequence of t.
You may assume that there is only lower case English letters in both s and t. t is potentially a very long (length ~= 500,000) string, and s is a short string (⇐100).
A subsequence of a string is a new string which is formed from the original string by deleting some (can be none) of the characters without disturbing the relative positions of the remaining characters. (ie, "ace" is a subsequence of "abcde" while "aec" is not).
Example 1:
s = "abc", t = "ahbgdc"
Return true.
Example 2:
s = "axc", t = "ahbgdc"
Return false.
Follow up:
If there are lots of incoming S, say S1, S2, … , Sk where k >= 1B, and you want to check one by one to see if T has its subsequence. In this scenario, how would you change your code?
Credits:
Special thanks to <a href="https://leetcode.com/pbrother/">@pbrother</a> for adding this problem and creating all test cases.
思路分析
双指针，当短指针到头也就是表明是子串。
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/**
* @author D瓜哥 · https://www.diguage.com
* @since 2024-09-20 21:50:25
*/
public boolean isSubsequence(String s, String t) {
if (s == null || s.length() == 0) {
return true;
}
int idx = 0;
for (int i = 0; i < t.length(); i++) {
if (idx >= s.length()){
break;
}
if (t.charAt(i) == s.charAt(idx)) {
idx++;
}
}
return idx >= s.length();
}