LeetCode - 30. Substring with Concatenation of All Words
30. Substring with Concatenation of All Words
Problem's Link
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Mean:
给你一个字符串s,和一个字符串集合words,找出s中words所有单词连续出现的起始下标.
analyse:
思路:窗口滑动算法.
枚举所有长度为words[0].length()的子串,然后使用窗口滑动算法来统计.
Trick:集合words是一个可重集,当连续出现的单词书大于words中的时,需要回退删除开头部分的单词,注意细节.
Time complexity: O(N)
view code
;
left = j + wl;
}
}
}
return ans;
}
};
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