add new solutions

solutions/8/q812/solution.go

@@ -0,0 +1,24 @@
+package q812
+
+func area2(a, b []int) float64 {
+	return float64((a[1]+b[1])*(b[0]-a[0])) / 2
+}
+
+func largestTriangleArea(points [][]int) float64 {
+	var maxArea float64
+
+	for a := 0; a < len(points)-2; a++ {
+		for b := a + 1; b < len(points)-1; b++ {
+			for c := b + 1; c < len(points); c++ {
+				area := area2(points[a], points[b]) + area2(points[b], points[c]) + area2(points[c], points[a])
+				if area < 0 {
+					area = -area
+				}
+				maxArea = max(maxArea, area)
+			}
+		}
+	}
+	return maxArea
+}
+
+var _ = largestTriangleArea