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1/I.cpp

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+#include <iostream>
+
+int FindNearestNeighbor(unsigned long long number, unsigned long long& power_first, unsigned long long& power_third) {
+  if (number < 5) {
+    power_first = 1;
+    power_third = 1;
+    return 3;
+  }
+  int binary_number[60];
+  int size = 0;
+  bool second_half = false;
+
+  while (number != 0) {
+    binary_number[size] = number % 2ULL;
+    number /= 2;
+    ++size;
+  }
+
+  for (int i = size - 1; i >= 0; --i) {
+    if (binary_number[i] == 1 && !second_half) {
+      if (power_first - 2 > size)
+        ++power_first;
+    } else if (binary_number[i] == 0) {
+      second_half = true;
+    } else if (binary_number[i] == 1 && second_half) {
+      power_third = i + 1;
+      return size;
+    }
+  }
+  return size;
+}
+
+void PrintBinaryNumber(long long number) {
+  int binary_number[60];
+  int size = 0;
+
+  while (number != 0) {
+    binary_number[size] = number % 2ULL;
+    number /= 2;
+    ++size;
+  }
+
+  for (int i = size - 1; i >= 0; --i) {
+    std::cout << binary_number[i];
+  }
+}
+
+int main() {
+//  unsigned long long start, stop;
+//  std::cin >> start >> stop;
+  unsigned long long start = 1, stop = 100000000000000000;
+  unsigned long long counter = 0;
+  unsigned long long power_first = 0;
+  unsigned long long power_third = 0;
+  unsigned long long number = 0;
+
+  int size = FindNearestNeighbor(start, power_first, power_third);
+
+  while (true) {
+    number = (1ULL << size) - (1ULL << (size - power_first)) + (1ULL << (power_third)) - 1;
+
+    if (number >= start && number <= stop) {
+      PrintBinaryNumber(number);
+      std::cout << " " << number << " " << power_first << " " << power_third << " " << size << std::endl;
+      ++counter;
+    }
+    if (number > stop) {
+      std::cout << counter;
+      return 0;
+    }
+
+
+    ++power_third;
+
+    if (power_third > size - power_first - 1) {
+      ++power_first;
+      power_third = 1;
+    }
+
+    if (power_first >= size - power_third) {
+      ++size;
+      power_first = 1;
+      power_third = 1;
+    }
+
+  }
+}