Precreation contest files

misc/others/other.cpp

@@ -0,0 +1,63 @@
+#include <cmath>
+#include <iostream>
+using namespace std;
+bool isComposite(int n) {
+  if (n <= 1) {
+    return false;
+  }
+  if (n <= 3) {
+    return false;
+  }
+  if (n % 2 == 0 || n % 3 == 0) {
+    return true;
+  }
+  int i = 5;
+  while (i * i <= n) {
+    if (n % i == 0 || n % (i + 2) == 0) {
+      return true;
+    }
+    i = i + 6;
+  }
+  return false;
+}
+int getSum(int n) {
+  int s = 0;
+  while (n > 0) {
+    s += n % 10;
+    n /= 10;
+  }
+  return s;
+}
+int getPrimeSum(int n) {
+  int s = 0;
+  while (n % 2 == 0) {
+    s += 2;
+    n /= 2;
+  }
+  for (int i = 3; i <= sqrt(n); i += 2) {
+    while (n % i == 0) {
+      s += getSum(i);
+      n /= i;
+    }
+  }
+  if (n > 2) {
+    s += getSum(n);
+  }
+  return s;
+}
+int main() {
+  int n;
+  cin >> n;
+  while (true) {
+    if (getSum(n) == getPrimeSum(n)) {
+      if (getPrimeSum(n) != 0) {
+        if (isComposite(n)) {
+          break;
+        }
+      }
+    }
+    n += 1;
+  }
+  cout << n << endl;
+  return 0;
+}