feat: add solutions to lc problem: No.1641

No.1641.Count Sorted Vowel Strings

Author: yanglbme

solution/1600-1699/1641.Count Sorted Vowel Strings/README.md

@@ -45,27 +45,87 @@
 	<li><code>1 <= n <= 50</code> </li>
 </ul>
 
-
 ## 解法
 
 <!-- 这里可写通用的实现逻辑 -->
 
+```
+a	e	i	o 	u
+1	1	1	1	1		n=1
+5	4	3	2	1		n=2
+15	10	6	3	1		n=3
+...						n=...
+```
+
 <!-- tabs:start -->
 
 ### **Python3**
 
 <!-- 这里可写当前语言的特殊实现逻辑 -->
 
 ```python
-
+class Solution:
+    def countVowelStrings(self, n: int) -> int:
+        cnt = [1] * 5
+        for i in range(2, n + 1):
+            for j in range(3, -1, -1):
+                cnt[j] += cnt[j + 1]
+        return sum(cnt)
 ```
 
 ### **Java**
 
 <!-- 这里可写当前语言的特殊实现逻辑 -->
 
 ```java
+class Solution {
+    public int countVowelStrings(int n) {
+        int[] cnt = new int[5];
+        Arrays.fill(cnt, 1);
+        for (int i = 2; i <= n; ++i) {
+            for (int j = 3; j >= 0; --j) {
+                cnt[j] += cnt[j + 1];
+            }
+        }
+        return Arrays.stream(cnt).sum();
+    }
+}
+```
+
+### **C++**
+
+```cpp
+class Solution {
+public:
+    int countVowelStrings(int n) {
+        vector<int> cnt(5, 1);
+        for (int i = 2; i <= n; ++i)
+            for (int j = 3; j >= 0; --j)
+                cnt[j] += cnt[j + 1];
+        return accumulate(cnt.begin(), cnt.end(), 0);
+    }
+};
+```
 
+### **Go**
+
+```go
+func countVowelStrings(n int) int {
+	cnt := make([]int, 5)
+	for i := range cnt {
+		cnt[i] = 1
+	}
+	for i := 2; i <= n; i++ {
+		for j := 3; j >= 0; j-- {
+			cnt[j] += cnt[j+1]
+		}
+	}
+	ans := 0
+	for _, v := range cnt {
+		ans += v
+	}
+	return ans
+}
 ```
 
 ### **...**

solution/1600-1699/1641.Count Sorted Vowel Strings/README_EN.md

@@ -41,21 +41,73 @@ Note that "ea" is not a valid string since 'e' comes after &#3
 	<li><code>1 &lt;= n &lt;= 50</code>&nbsp;</li>
 </ul>
 
-
 ## Solutions
 
 <!-- tabs:start -->
 
 ### **Python3**
 
 ```python
-
+class Solution:
+    def countVowelStrings(self, n: int) -> int:
+        cnt = [1] * 5
+        for i in range(2, n + 1):
+            for j in range(3, -1, -1):
+                cnt[j] += cnt[j + 1]
+        return sum(cnt)
 ```
 
 ### **Java**
 
 ```java
+class Solution {
+    public int countVowelStrings(int n) {
+        int[] cnt = new int[5];
+        Arrays.fill(cnt, 1);
+        for (int i = 2; i <= n; ++i) {
+            for (int j = 3; j >= 0; --j) {
+                cnt[j] += cnt[j + 1];
+            }
+        }
+        return Arrays.stream(cnt).sum();
+    }
+}
+```
+
+### **C++**
+
+```cpp
+class Solution {
+public:
+    int countVowelStrings(int n) {
+        vector<int> cnt(5, 1);
+        for (int i = 2; i <= n; ++i)
+            for (int j = 3; j >= 0; --j)
+                cnt[j] += cnt[j + 1];
+        return accumulate(cnt.begin(), cnt.end(), 0);
+    }
+};
+```
 
+### **Go**
+
+```go
+func countVowelStrings(n int) int {
+	cnt := make([]int, 5)
+	for i := range cnt {
+		cnt[i] = 1
+	}
+	for i := 2; i <= n; i++ {
+		for j := 3; j >= 0; j-- {
+			cnt[j] += cnt[j+1]
+		}
+	}
+	ans := 0
+	for _, v := range cnt {
+		ans += v
+	}
+	return ans
+}
 ```
 
 ### **...**

solution/1600-1699/1641.Count Sorted Vowel Strings/Solution.cpp

@@ -0,0 +1,10 @@
+class Solution {
+public:
+    int countVowelStrings(int n) {
+        vector<int> cnt(5, 1);
+        for (int i = 2; i <= n; ++i)
+            for (int j = 3; j >= 0; --j)
+                cnt[j] += cnt[j + 1];
+        return accumulate(cnt.begin(), cnt.end(), 0);
+    }
+};

solution/1600-1699/1641.Count Sorted Vowel Strings/Solution.go

@@ -0,0 +1,16 @@
+func countVowelStrings(n int) int {
+	cnt := make([]int, 5)
+	for i := range cnt {
+		cnt[i] = 1
+	}
+	for i := 2; i <= n; i++ {
+		for j := 3; j >= 0; j-- {
+			cnt[j] += cnt[j+1]
+		}
+	}
+	ans := 0
+	for _, v := range cnt {
+		ans += v
+	}
+	return ans
+}

solution/1600-1699/1641.Count Sorted Vowel Strings/Solution.java

@@ -0,0 +1,12 @@
+class Solution {
+    public int countVowelStrings(int n) {
+        int[] cnt = new int[5];
+        Arrays.fill(cnt, 1);
+        for (int i = 2; i <= n; ++i) {
+            for (int j = 3; j >= 0; --j) {
+                cnt[j] += cnt[j + 1];
+            }
+        }
+        return Arrays.stream(cnt).sum();
+    }
+}

solution/1600-1699/1641.Count Sorted Vowel Strings/Solution.py

@@ -0,0 +1,7 @@
+class Solution:
+    def countVowelStrings(self, n: int) -> int:
+        cnt = [1] * 5
+        for i in range(2, n + 1):
+            for j in range(3, -1, -1):
+                cnt[j] += cnt[j + 1]
+        return sum(cnt)