Submission #66736576

Source Code Expand

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from collections import deque
n,m=map(int,input().split())
g=[[] for _ in range(n+1)]
for _ in range(m):
    a,b,w=map(int,input().split())
    g[a].append((b,w))
d=[-1]*(n+1)
d[1]=0
q=deque()
q.append(1)
basis=[]
def insert(x):
    for b in basis:
        x=min(x,x^b)
    if x:
        basis.append(x)
while q:
    v=q.popleft()
    for u,w in g[v]:
        x=d[v]^w
 
 
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from collections import deque

n,m=map(int,input().split())
g=[[] for _ in range(n+1)]
for _ in range(m):
    a,b,w=map(int,input().split())
    g[a].append((b,w))
d=[-1]*(n+1)
d[1]=0
q=deque()
q.append(1)
basis=[]
def insert(x):
    for b in basis:
        x=min(x,x^b)
    if x:
        basis.append(x)
while q:
    v=q.popleft()
    for u,w in g[v]:
        x=d[v]^w
        if d[u]==-1:
            d[u]=x
            q.append(u)
        else:
            insert(d[u]^x)
if d[n]==-1:
    print(-1)
else:
    res=d[n]
    for b in basis:
        res=min(res,res^b)
    print(res)

Submission Info

Judge Result