1041 accepted.

aQuaYi · aQuaYi · commit 1531de686792 · 2019-06-30T19:36:17.000+08:00
diff --git a/Algorithms/1041.robot-bounded-in-circle/robot-bounded-in-circle.go b/Algorithms/1041.robot-bounded-in-circle/robot-bounded-in-circle.go
@@ -1,12 +1,13 @@
 package problem1041
 
 func isRobotBounded(instructions string) bool {
+	print(north, east, south, west)
 	r := newRobot()
 	for _, i := range instructions {
 		r.receive(i)
 	}
-	return (r.x == 0 && r.y == 0) ||
-		(r.d != north)
+	return (r.x == 0 && r.y == 0) || // 每轮都会回到原点，就永远会回到原点
+		(r.d != north) // 第一轮后，没有回到原点，但是方向改变，至多 4 轮后，还是会回到原点
 }
 
 type direction int
@@ -56,5 +57,5 @@ func (r *robot) turn(instruction rune) {
 	} else {
 		r.d--
 	}
-	r.d = r.d % 4
+	r.d = (r.d + 4) % 4
 }

Original file line number	Diff line number	Diff line change
`@@ -1,12 +1,13 @@`
`1`	`1`	`package problem1041`
`2`	`2`
`3`	`3`	`func isRobotBounded(instructions string) bool {`
	`4`	`+ print(north, east, south, west)`
`4`	`5`	`r := newRobot()`
`5`	`6`	`for _, i := range instructions {`
`6`	`7`	`r.receive(i)`
`7`	`8`	`}`
`8`		`- return (r.x == 0 && r.y == 0) \|\|`
`9`		`- (r.d != north)`
	`9`	`+ return (r.x == 0 && r.y == 0) \|\| // 每轮都会回到原点，就永远会回到原点`
	`10`	`+ (r.d != north) // 第一轮后，没有回到原点，但是方向改变，至多 4 轮后，还是会回到原点`
`10`	`11`	`}`
`11`	`12`
`12`	`13`	`type direction int`
`@@ -56,5 +57,5 @@ func (r *robot) turn(instruction rune) {`
`56`	`57`	`} else {`
`57`	`58`	`r.d--`
`58`	`59`	`}`
`59`		`- r.d = r.d % 4`
	`60`	`+ r.d = (r.d + 4) % 4`
`60`	`61`	`}`