Easy
走一遍整个路径，记录每一个经过的坐标，如果新的坐标在之前的坐标中出现过，说明路径是相交的
以上，AC！
python3
class Solution:
def isPathCrossing(self, path: str) -> bool:
cur = [0,0]
visited = []
visited.append(cur)
for i in path:
if i == 'N':
cur = [cur[0], cur[1] + 1]
elif i == 'S':
cur = [cur[0], cur[1] - 1]
elif i == 'E':
cur = [cur[0] + 1, cur[1]]
else:
cur = [cur[0] - 1, cur[1]]
print(cur)
if cur in visited:
return True
visited.append(cur)
return False