Submission #3775271

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Source Code Expand

N,M=map(int,input().split())
flag = False
v=[]
x=[]
y=[]
for i in range(M):
    a,b=map(int,input().split())
    v.append((a,b))
    if a==1:
        x.append(b)
    if b==N:
        y.append(a)
for i in x:
    for j in y:
        if i==j:
            flag=True
            break
    if flag:
        print("POSSIBLE")
        break
else:
    print("IMPOSSIBLE")

Submission Info

Judge Result