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// @Title: 判断子序列 (Is Subsequence)
// @Author: 15816537946@163.com
// @Date: 2019-11-17 22:53:59
// @Runtime: 16 ms
// @Memory: 6.3 MB
func isSubsequence(s string, t string) bool {
	var i,j int
	for i <len(s) && j < len(t) {
		if s[i] == t[j] {
			i++
		}
		j++
	}

	return i == len(s)
}