урок 4

kutuzzzov

Aug 26th, 2022

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#include <iostream>
#include <cstdlib>
#include <iomanip>
#include <map>
#include <set>
#include <string>
#include <vector>
using namespace std;
// вывод запятых
template <typename Term>
void Print (ostream& out, const Term& container) {
bool is_first = ", ";
for (const auto& element : container) {
if (is_first) {
out << element; is_first = !", ";
} else {
out << ", " << element;
}
}
return;
}
// шаблон для вектора
template <typename T>
ostream& operator<<(ostream& out, const vector<T>& container) {
Print(out << "["s, container);
return out << "]"s;
}
// шаблон для множества
template <typename T, typename U>
ostream& operator<<(ostream& out, const set<T, U>& container) {
Print(out << "{"s, container);
return out << "}"s;
}
// шаблон для пар
template <typename T, typename U>
ostream& operator<<(ostream& out, const pair<T, U>& container) {
out << container.first;
out << ": "s;
out << container.second;
return out;
}
// шаблон для словаря
template <typename T, typename U>
ostream& operator<<(ostream& out, const map<T, U>& container) {
out << "{";
Print (out, container);
out << "}";
return out;
}
template <typename T, typename U>
void AssertEqualImpl(const T& t, const U& u, const string& t_str, const string& u_str, const string& file,
const string& func, unsigned line, const string& hint) {
if (t != u) {
cout << boolalpha;
cout << file << "("s << line << "): "s << func << ": "s;
cout << "ASSERT_EQUAL("s << t_str << ", "s << u_str << ") failed: "s;
cout << t << " != "s << u << "."s;
if (!hint.empty()) {
cout << " Hint: "s << hint;
}
cout << endl;
abort();
}
}
#define ASSERT_EQUAL(a, b) AssertEqualImpl((a), (b), #a, #b, __FILE__, __FUNCTION__, __LINE__, ""s)
#define ASSERT_EQUAL_HINT(a, b, hint) AssertEqualImpl((a), (b), #a, #b, __FILE__, __FUNCTION__, __LINE__, (hint))
void AssertImpl(bool value, const string& expr_str, const string& file, const string& func, unsigned line,
const string& hint) {
if (!value) {
cout << file << "("s << line << "): "s << func << ": "s;
cout << "ASSERT("s << expr_str << ") failed."s;
if (!hint.empty()) {
cout << " Hint: "s << hint;
}
cout << endl;
abort();
}
}
#define ASSERT(expr) AssertImpl(!!(expr), #expr, __FILE__, __FUNCTION__, __LINE__, ""s)
#define ASSERT_HINT(expr, hint) AssertImpl(!!(expr), #expr, __FILE__, __FUNCTION__, __LINE__, (hint))
vector<int> TakeEvens(const vector<int>& numbers) {
vector<int> evens;
for (int x : numbers) {
if (x % 2 == 0) {
evens.push_back(x);
}
}
return evens;
}
map<string, int> TakeAdults(const map<string, int>& people) {
map<string, int> adults;
for (const auto& [name, age] : people) {
if (age >= 18) {
adults[name] = age;
}
}
return adults;
}
bool IsPrime(int n) {
if (n < 2) {
return false;
}
int i = 2;
while (i * i <= n) {
if (n % i == 0) {
return false;
}
++i;
}
return true;
}
set<int> TakePrimes(const set<int>& numbers) {
set<int> primes;
for (int number : numbers) {
if (IsPrime(number)) {
primes.insert(number);
}
}
return primes;
}
int main() {
{
const set<int> numbers = {-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
const set<int> expected_primes = {2, 3, 5, 7, 11, 13};
ASSERT_EQUAL(TakePrimes(numbers), expected_primes);
}
{
const map<string, int> people = {{"Ivan"s, 19}, {"Sergey"s, 16}, {"Alexey"s, 18}};
const map<string, int> expected_adults = {{"Alexey"s, 18}, {"Ivan"s, 19}};
ASSERT_EQUAL(TakeAdults(people), expected_adults);
}
{
const vector<int> numbers = {3, 2, 1, 0, 3, 6};
const vector<int> expected_evens = {2, 0, 6};
ASSERT_EQUAL(TakeEvens(numbers), expected_evens);
}
}

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