Add Soulution2.go for 0010.Regular Expression Matching

Author: Yeqi Tao

solution/0010.Regular Expression Matching/Solution2.go

@@ -0,0 +1,38 @@
+func isMatch(s string, p string) bool {
+	lenS := len(s)
+	lenP := len(p)
+	// init dp note
+	note := make([][]int8, lenS+1)
+	for i:=0; i<=lenS; i++  {
+		note[i] = make([]int8, lenP+1)
+		for j:=0; j<=lenP; j++ {
+			note[i][j] = -1
+		}
+	}
+
+	return dp(0, 0, s, p, note)
+}
+
+func dp(i,j int, s,p string, note [][]int8) bool {
+	if note[i][j] != -1 {
+		return note[i][j] == 1
+	}
+	var ans bool
+	if j == len(p) {
+		ans = i == len(s)
+	} else {
+		fm := i < len(s) && (s[i] == p[j] || p[j] == '.')
+		if j + 1 < len(p) && p[j+1] == '*' {
+			ans = dp(i, j+2, s, p, note) || (fm && dp(i+1, j, s, p, note))
+		} else {
+			ans = fm && dp(i+1, j+1, s, p, note)
+		}
+	}
+
+	if ans {
+		note[i][j] = 1
+	} else {
+		note[i][j] = 0
+	}
+	return ans
+}