some programs!

cs101/dh_20260917_02_subway.cpp

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+#include <cmath>
+#include <iomanip>
+#include <iostream>
+
+using namespace std;
+
+double get_price(int spent_money, int distance) {
+    double price = 0;
+    if (distance <= 6) {
+        price = 3;
+    } else {
+        price = 4;
+    }
+    distance -= 12;
+    if (distance > 0 && distance <= 32 - 12) { price += ceil(distance / 10.0); }
+    distance -= 32 - 12;
+    if (distance > 0) { price += ceil(distance / 20.0); }
+    if (spent_money >= 400) { return price; }
+    if (spent_money >= 150) { return price * 0.5; }
+    if (spent_money >= 100) { return price * 0.8; }
+    return price;
+}
+
+int main() {
+    ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    int spent_money, distance;
+    cin >> spent_money >> distance;
+    cout << fixed << setprecision(2) << get_price(spent_money, distance) << endl;
+
+
+    return 0;
+}