git reimport

archive/2016.08/2016.08.31 - unsorted/SnarkD.java

@@ -0,0 +1,29 @@
+package chelper;
+
+import io.InputReader;
+import io.OutputWriter;
+
+public class SnarkD {
+  public void solve(int testNumber, InputReader in, OutputWriter out) {
+    int n = in.nextInt();
+
+    for (int i = 0; i < n; i++) {
+      double l = in.nextInt() / 2.0;
+      double r = in.nextInt();
+
+      if (r < l) {
+        out.println(Math.PI * r * r);
+        continue;
+      }
+
+      if (r > l * Math.sqrt(2)) {
+        out.println(4 * l * l);
+        continue;
+      }
+
+      double a = Math.acos(1.0 * l / r);
+
+      out.println((Math.PI - 4 * a) * r * r + l * Math.sin(a) * r * 4);
+    }
+  }
+}