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kth-competitive-programming · Nov 4, 2019 · a03b73a · a03b73a
1 parent 5952d3e
commit a03b73a
Showing 1 changed file with 9 additions and 9 deletions.
diff --git a/content/geometry/CircleCircleArea.h b/content/geometry/CircleCircleArea.h
@@ -9,13 +9,13 @@
 
 template<class P>
 double circleCircleArea(P c, double cr, P d, double dr) {
-	if (cr < dr) swap(c, d), swap(cr, dr);
-	auto A = [&](double r, double h) {
-		return r*r*acos(h/r)-h*sqrt(r*r-h*h);
-	};
-	auto l = (c - d).dist(), a = (l*l + cr*cr - dr*dr)/(2*l);
-	if (sgn(l - cr - dr) >= 0) return 0; // far away
-	if (sgn(l - cr + dr) <= 0) return M_PI*dr*dr;
-	if (sgn(l - cr) >= 0) return A(cr, a) + A(dr, l-a);
-	else return A(cr, a) + M_PI*dr*dr - A(dr, a-l);
+  if (cr < dr) swap(c, d), swap(cr, dr);
+  auto A = [&](double r, double h) {
+    return r*r*acos(h/r)-h*sqrt(r*r-h*h);
+  };
+  auto l = (c - d).dist(), a = (l*l + cr*cr - dr*dr)/(2*l);
+  if (l - cr - dr >= 0) return 0; // far away
+  if (l - cr + dr <= 0) return M_PI*dr*dr;
+  if (l - cr >= 0) return A(cr, a) + A(dr, l-a);
+  else return A(cr, a) + M_PI*dr*dr - A(dr, a-l);
 }