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task2.cpp

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+#include <iostream>
+using namespace std;
+
+int main() {
+    double ab;
+    double bc;
+    double weight;
+    cout << "Distance A-B: ";
+    cin >> ab;
+    cout << "Distance B-C: ";
+    cin >> bc;
+    cout << "Cargo weight: ";
+    cin >> weight;
+
+    double fuel;
+    if (weight <= 500) fuel = 1;
+    else if (weight <= 1000) fuel = 4;
+    else if (weight <= 1500) fuel = 7;
+    else if (weight <= 2000) fuel = 9;
+    else {
+        cout << "The airplane cannot lift such a load!" << endl;
+        return 0;
+    }
+
+    double nAB = ab * fuel;
+    double nBC = bc * fuel;
+
+    if (nAB > 300) {
+        cout << "It is impossible to reach point B by flight." << endl;
+    }
+    else if (nBC > 300) {
+        cout << "It is impossible to fly from B to C." << endl;
+    }
+    else {
+        double fill = max(0.0, nBC - (300 - nAB));
+        cout << "Minimum refuel at B: " << fill << " liters." << endl;
+    }
+    return 0;
+}