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pojcs101_E01003.cpp

@@ -0,0 +1,30 @@
+#include <iostream>
+#include <vector>
+
+
+static std::vector<double> max_lengths;
+
+static void init() {
+    double length = 0;
+    for (int i = 2; length < 5.5; i++) {
+        max_lengths.push_back(length);
+        length += 1.0 / i;
+    }
+}
+
+
+int main() {
+    init();
+    double target_length = 0;
+    for (;;) {
+        std::cin >> target_length;
+        if (target_length == 0) { break; }
+        for (int i = 0;; i++) {
+            if (max_lengths[i] > target_length) {
+                std::cout << i << " card(s)" << std::endl;
+                break;
+            }
+        }
+    }
+    return 0;
+}