[20250723] BAJ / 골드4 / 사다리 / 양진혁

JinHyeok/202507/23 BAJ 사다리.md

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+```
+#include <iostream>
+#include <cmath>
+using namespace std;
+
+double x, y, c;
+
+double getHeight(double len, double width) {
+    return sqrt(len * len - width * width);
+}
+
+bool isPossible(double width) {
+    double h1 = getHeight(x, width);
+    double h2 = getHeight(y, width);
+    double meet = (h1 * h2) / (h1 + h2);
+    return meet >= c;
+}
+
+int main() {
+    cin >> x >> y >> c;
+
+    double low = 0;
+    double high = min(x, y);
+    double mid;
+
+    for (int i = 0; i < 100; ++i) {
+        mid = (low + high) / 2;
+        if (isPossible(mid)) {
+            low = mid;
+        } else {
+            high = mid;
+        }
+    }
+
+    cout.precision(10);
+    cout << fixed << mid << endl;
+
+    return 0;
+}
+
+
+```