diff --git a/src/main/java/contest/y2021/m11/week/Solution266.java b/src/main/java/contest/y2021/m11/week/Solution266.java
new file mode 100644
index 0000000..22131b6
--- /dev/null
+++ b/src/main/java/contest/y2021/m11/week/Solution266.java
@@ -0,0 +1,116 @@
+package contest.y2021.m11.week;
+
+
+import com.code.leet.entiy.TwoArray;
+
+import java.util.*;
+
+/**
+ * @description:
+ * @author: Administrator
+ * @date: 2021/8/22-10:29
+ */
+public class Solution266 {
+    public static void main(String[] args) {
+        Solution266 solution = new Solution266();
+//        TwoArray twoArray = new TwoArray("[[0,1,10],[1,2,11],[2,3,12],[1,3,13]]", true);
+//        System.out.println(solution.maximalPathQuality(new int[]{1, 2, 3, 4}, twoArray.getArr(), 50));
+        TwoArray twoArray = new TwoArray("[[0,1,10],[1,2,15],[0,3,10]]", true);
+        System.out.println(solution.maximalPathQuality(new int[]{0, 32, 10, 43}, twoArray.getArr(), 49));
+    }
+
+    public int countVowelSubstrings(String word) {
+        int sum = 0;
+        char[] chs = word.toCharArray();
+        for (int i = 0; i < word.length(); i++) {
+            sum += dfs(chs, i, Arrays.asList('a', 'e', 'i', 'o', 'u'), 0, new int[5], 0);
+        }
+        return sum;
+    }
+
+    private int dfs(char[] chs, int index, List<Character> list, int sum, int[] arrs, int count) {
+        if (index == chs.length) {
+            return sum;
+        }
+        if (!list.contains(chs[index])) {
+            return count == 5 ? sum : 0;
+        }
+        if (count < 5 && arrs[list.indexOf(chs[index])] == 0) {
+            count++;
+        }
+        arrs[list.indexOf(chs[index])]++;
+        if (count == 5) {
+            sum += 1;
+        }
+        return dfs(chs, index + 1, list, sum, arrs, count);
+    }
+
+    public long countVowels(String word) {
+        char[] chs = word.toCharArray();
+        long sum = 0;
+        List<Character> list = Arrays.asList('a', 'e', 'i', 'o', 'u');
+        for (int i = 0; i < word.length(); i++) {
+            if (list.contains(chs[i])) {
+                sum += (long) (i + 1) * (chs.length - i);
+            }
+        }
+        return sum;
+    }
+
+    public int maximalPathQuality(int[] values, int[][] edges, int maxTime) {
+        Map<Integer, List<int[]>> map = new HashMap<>();
+        for (int i = 0; i < values.length; i++) {
+            map.put(i, new ArrayList<>());
+        }
+        for (int[] edge : edges) {
+            List<int[]> list = map.get(edge[0]);
+            list.add(new int[]{edge[1], edge[2]});
+            map.put(edge[0], list);
+            list = map.get(edge[1]);
+            list.add(new int[]{edge[0], edge[2]});
+            map.put(edge[1], list);
+        }
+        max = values[0];
+        int[] use = new int[values.length];
+        use[0] = 1;
+        pathDfs(map, values[0], use, maxTime, 0, 0, values);
+        return max;
+    }
+
+    int max;
+
+    private void pathDfs(Map<Integer, List<int[]>> map, int value, int[] use, int maxTime, int time, int index, int[] values) {
+        List<int[]> list = map.get(index);
+        for (int[] arr : list) {
+            time += arr[1];
+            if (time > maxTime) {
+                time -= arr[1];
+                continue;
+            }
+            if (arr[0] > 0 && use[arr[0]] == 2) {
+                continue;
+            }
+            if (use[arr[0]] == 0) {
+                value += values[arr[0]];
+            }
+            use[arr[0]]++;
+            if (arr[0] == 0) {
+                max = Math.max(value, max);
+            }
+            if (time == maxTime) {
+                time -= arr[1];
+                if (use[arr[0]] == 1) {
+                    value -= values[arr[0]];
+                }
+                use[arr[0]]--;
+                continue;
+            }
+            pathDfs(map, value, use, maxTime, time, arr[0], values);
+            time -= arr[1];
+            if (use[arr[0]] == 1) {
+                value -= values[arr[0]];
+            }
+            use[arr[0]]--;
+        }
+    }
+}