#include "bits/stdc++.h"
using namespace std;

int32_t main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);

  // initializing array
  vector<int> a = {1, 2, 3, 4, 5, -6};

  // checking if all elements are odds
  bool allOdds = all_of(a.begin(), a.end(), [](int x) { 
    return x % 2 != 0; 
  });

  if (allOdds) {
    cout << "All are odds numbers\n";
  } else {
    cout << "All are not odds numbers\n";
  }

  // output:
  // All are not odds numbers
}

#include "bits/stdc++.h"
using namespace std;

int32_t main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);

  // initializing array
  vector<int> a = {1, 2, 3, 4, 5, -6};

  // checking if any element is negative.
  bool anyNegative = any_of(a.begin(), a.end(), [](int x) {
    return x < 0;
  });

  if (anyNegative) {
    cout << "There are exists a negative element\n";
  } else {
    cout << "All are positive elements\n";
  }

  // output:
  // There are exists a negative element
}

#include "bits/stdc++.h"
using namespace std;

int32_t main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);

  // initializing array
  vector<int> a = {1, 2, 3, 4, 5, -6};

  // checking if no element is negative.
  bool noNegative = none_of(a.begin(), a.end(), [](int x) {
    return x < 0; 
  });

  if (noNegative) {
    cout << "No negative elements\n";
  } else {
    cout << "There are negative element\n";
  }

  // output:
  // There are negative element
}

#include "bits/stdc++.h"
using namespace std;

int32_t main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);

  // initializing array
  vector<int> a(6, 0);

  // using iota() to assign values
  iota(a.begin(), a.end(), 20);

  // displaying the new array
  cout << "The new array after assigning values is: ";

  for (auto &x: a) {
    cout << x << " \n"[&x == &a.back()];
  }

  // output:
  // The new array after assigning values is: 20 21 22 23 24 25
}

#include "bits/stdc++.h"
using namespace std;

int fun(int x, int y) {
  return x * y;
}

int32_t main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);

  int initValue = 1;
  vector<int> a = {5, 10, 15};

  // simple default accumulate function
  cout << "Result using accumulate: " << accumulate(a.begin(), a.end(), initValue) << "\n";

  // using accumulate function with user-defined function
  cout << "Result using accumulate with user-defined function: " << accumulate(a.begin(), a.end(), initValue, fun) << "\n";

  // using accumulate function with pre-defined function
  cout << "Result using accumulate with pre-defined function " << accumulate(a.begin(), a.end(), initValue, minus<int>()) << "\n";

  // Output:
  // Result using accumulate: 31
  // Result using accumulate with user-defined function: 750
  // Result using accumulate with pre-defined function -29
}