백준 5014 스타트링크

from collections import deque#f=총 층, g=스타트링크의 층, s=내가있는층, u=u층위로, d=d층아래로
f,s,g,u,d=map(int,input().split())arr=[-1 for _ in range(f+1)]que=deque([s])
arr[s]=0if s==g:    print(0)    exit()while que:    now=que.popleft()    
    for next in (now+u,now-d):        if 0<next<=f and arr[next]==-1:
            arr[next]=arr[now]+1            que.append(next)
            if next==g:                print(arr[next])                exit()
print("use the stairs")