r没有赋初始值，把```int r;```改成```int r=0;```就好了
by Jason_Ming @ 2024-05-03 10:54:46
@[wengbowen](/user/794188)
by Jason_Ming @ 2024-05-03 10:59:44
@[Jason_Ming](/user/1014421)
感谢，AC了
by furina_1013 @ 2024-05-03 11:11:08