diff --git a/daily/May3.cpp b/daily/May3.cpp
new file mode 100644
index 0000000..cafa970
--- /dev/null
+++ b/daily/May3.cpp
@@ -0,0 +1,15 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+class Solution {
+ public:
+  double average(vector<int>& salary) {
+    sort(salary.begin(), salary.end());
+    int len = salary.size();
+    double res = 0;
+    for (int i = 1; i < len - 1; i++) {
+      res += salary[i];
+    }
+    return res / (len - 2);
+  }
+};
\ No newline at end of file
diff --git a/daily/May5.cpp b/daily/May5.cpp
new file mode 100644
index 0000000..69912dc
--- /dev/null
+++ b/daily/May5.cpp
@@ -0,0 +1,61 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+class Solution {
+ public:
+  vector<int> decrypt(vector<int>& code, int k) {
+    int len = code.size();
+    vector<int> ans(len, 0);
+    if (k == 0) {
+      return ans;
+    }
+
+    for (int i = 0; i < len; i++) {
+      if (k > 0) {
+        int tmp = k;
+        while (tmp > 0) {
+          ans[i] += code[(i + tmp) % len];
+          tmp--;
+        }
+      }
+
+      if (k < 0) {
+        int tmp = k;
+        while (tmp < 0) {
+          ans[i] += code[(i + tmp + len) % len];
+          tmp++;
+        }
+      }
+    }
+
+    return ans;
+  }
+};
+
+class Contest396 {
+ public:
+  bool isValid(string word) {
+    if (word.size() < 3) return false;
+
+    bool vowel = false;
+    bool non_vowel = false;
+    for (char c : word) {
+      if (!((c - '0' >= 0 && c - '0' <= 9) || (c - 'a' >= 0 && c - 'a' < 26) ||
+            (c - 'A' >= 0 && c - 'A' < 26))) {
+        return false;
+      }
+
+      if (c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u' ||
+          c == 'A' || c == 'E' || c == 'I' || c == 'O' || c == 'U') {
+        vowel = true;
+      } else if ((c - 'a' >= 0 && c - 'a' < 26) ||
+                 (c - 'A' >= 0 && c - 'A' < 26)) {
+        non_vowel = true;
+      }
+    }
+    if (vowel && non_vowel) {
+      return true;
+    }
+    return false;
+  }
+};
\ No newline at end of file