Merge pull request #511 from openset/develop

Add: Valid Boomerang

Author: Shuo

problems/valid-boomerang/valid_boomerang.go

@@ -0,0 +1,8 @@
+package valid_boomerang
+
+func isBoomerang(points [][]int) bool {
+	ans := points[0][0] * (points[1][1] - points[2][1])
+	ans += points[1][0] * (points[2][1] - points[0][1])
+	ans += points[2][0] * (points[0][1] - points[1][1])
+	return ans != 0
+}

problems/valid-boomerang/valid_boomerang_test.go

@@ -0,0 +1,35 @@
+package valid_boomerang
+
+import "testing"
+
+type caseType struct {
+	input    [][]int
+	expected bool
+}
+
+func TestIsBoomerang(t *testing.T) {
+	tests := [...]caseType{
+		{
+			input: [][]int{
+				{1, 1},
+				{2, 3},
+				{3, 2},
+			},
+			expected: true,
+		},
+		{
+			input: [][]int{
+				{1, 1},
+				{2, 2},
+				{3, 3},
+			},
+			expected: false,
+		},
+	}
+	for _, tc := range tests {
+		output := isBoomerang(tc.input)
+		if output != tc.expected {
+			t.Fatalf("input: %v, output: %v, expected: %v", tc.input, output, tc.expected)
+		}
+	}
+}