create dev channel

zeta/cpp/completed/5597.cpp

@@ -0,0 +1,18 @@
+#include <iostream>
+
+int main() {
+    int *arr = new int[30]{0};
+    int index;
+    for (int i = 0; i < 30; i++) {
+        std::cin >> index;
+        arr[index - 1] = 1;
+    }
+
+        for (int i = 0; i < 30; i++) {
+        if (!arr[i]) {
+            std::cout << i + 1 << std::endl;
+        }
+    }
+
+    return 0;
+}