Update CMakeLists.txt

_others/qyz/test.cpp

@@ -0,0 +1,18 @@
+#include <iostream>
+
+using namespace std;
+
+
+// x[0]..x[99]
+
+bool is_prime(int n) {
+    for (int i=2; i*i<=n; i++) {
+        if (n%i == 0) {return false;}
+    }
+    return true;
+}
+
+int main() {
+    cout << is_prime(4);
+    return 0;
+}