add new solutions

solutions/10/q1041/solution.go

@@ -0,0 +1,40 @@
+package q1041
+
+type Dir int8
+
+const (
+	UP Dir = iota
+	RIGHT
+	DOWN
+	LEFT
+)
+
+func (d Dir) TurnL() Dir { return (d + 3) % 4 }
+func (d Dir) TurnR() Dir { return (d + 1) % 4 }
+
+var vects = [][2]int{{0, -1}, {1, 0}, {0, 1}, {-1, 0}}
+
+func isRobotBounded(instructions string) bool {
+	x, y, d := 0, 0, UP
+
+	for range 4 {
+		for i := range len(instructions) {
+			switch instructions[i] {
+			case 'G':
+				x += vects[d][0]
+				y += vects[d][1]
+			case 'L':
+				d = d.TurnL()
+			case 'R':
+				d = d.TurnR()
+			}
+		}
+
+		if x == 0 && y == 0 && d == UP {
+			return true
+		}
+	}
+	return false
+}
+
+var _ = isRobotBounded