2022-01-10：路径交叉。给你一个整数数组 distance 。
从 X-Y 平面上的点 (0,0) 开始，先向北移动 distance[0] 米，然后向西移动 distance[1] 米，向南移动 distance[2] 米，向东移动 distance[3] 米，持续移动。也就是说，每次移动后你的方位会发生逆时针变化。
判断你所经过的路径是否相交。如果相交，返回 true ；否则，返回 false 。
力扣335。
答案2022-01-10：
讨论4种情况。
1.i跟i-3撞。
2.i跟i-4撞，追尾。
3.i跟i-5撞。
4.i跟i-6撞。
代码用golang编写。代码如下：
package main
import "fmt"
func main() {
arr := []int{2, 2, 3, 2, 2}
fmt.Println(isSelfCrossing(arr))
}
func isSelfCrossing(x []int) bool {
if len(x) < 4 {
return false
}
if (len(x) > 3 && x[2] <= x[0] && x[3] >= x[1]) || (len(x) > 4 && ((x[3] <= x[1] && x[4] >= x[2]) || (x[3] == x[1] && x[0]+x[4] >= x[2]))) {
return true
}
for i := 5; i < len(x); i++ {
if x[i-1] <= x[i-3] && ((x[i] >= x[i-2]) || (x[i-2] >= x[i-4] && x[i-5]+x[i-1] >= x[i-3] && x[i-4]+x[i] >= x[i-2])) {
return true
}
}
return false
}
执行结果如下：
***
[左神java代码](
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