upd

contests/8contest/5.cpp

@@ -0,0 +1,38 @@
+#include <iostream>
+#include <chrono>
+#include <iomanip>
+#include <sstream>
+
+std::chrono::system_clock::time_point parse_date(const std::string& date_str) {
+    std::tm tm = {};
+    std::istringstream ss(date_str);
+    ss >> std::get_time(&tm, "%Y-%m-%d");
+
+    return std::chrono::system_clock::from_time_t(std::mktime(&tm));
+}
+
+int days_between(const std::chrono::system_clock::time_point& start, const std::chrono::system_clock::time_point& end) {
+    auto duration = end - start;
+
+    return std::chrono::duration_cast<std::chrono::hours>(duration).count() / 24;
+}
+
+int main() {
+    int sum = 0;
+
+    std::string date1, date2;
+    std::cin >> date1;
+
+    while (std::cin >> date2) {
+        auto start = parse_date(date1);
+        auto end = parse_date(date2);
+
+        sum += std::abs(days_between(start, end));
+
+        date1 = date2;
+    }
+
+    std::cout << sum << std::endl;
+
+    return 0;
+}