Golang | Leetcode Golang题解之第392题判断子序列
题目：
题解：
func isSubsequence(s string, t string) bool {
n, m := len(s), len(t)
f := make([][26]int, m + 1)
for i := 0; i < 26; i++ {
f[m][i] = m
}
for i := m - 1; i >= 0; i-- {
for j := 0; j < 26; j++ {
if t[i] == byte(j + 'a') {
f[i][j] = i
} else {
f[i][j] = f[i + 1][j]
}
}
}
add := 0
for i := 0; i < n; i++ {
if f[add][int(s[i] - 'a')] == m {
return false
}
add = f[add][int(s[i] - 'a')] + 1
}
return true
}