Submission #1606022

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Source Code Expand

N,M = map(int,input().split())
es = []
for i in range(M):
    a,b,c = map(int,input().split())
    a,b = a-1, b-1
    c *= -1
    es.append((a,b,c))

INF = float('inf')
def solve():
    d = [INF for i in range(N)]
    d[0] = 0
    for i in range(N):
        for fr,to,cost in es:
            if d[fr] == INF: continue
            if d[to] > d[fr] + cost:
                d[to] = d[fr] + cost
                if i == N-1 and to == N-1: return 'inf'
    return -d[N-1]

print(solve())

Submission Info

Judge Result