Submission #3622371

---

Source Code Expand

def DFS(N, copyedge):
    matrix = [[] for i in range(M)]
    for a, b in copyedge:
        matrix[a].append(b)
        matrix[b].append(a)
        
    check = [True]*N
    check[0] = False
    Que = [0]

    while len(Que) != 0:
        now = Que.pop()
        for i in matrix[now]:
            if check[i] == True:
                check[i] = False
                Que.append(i)
    if True not in check:
        return 0
    else:
        return 1
            
        

ans = 0
N, M = map(int, input().split())
edge = []

for i in range(M):
    edge.append([int(i) - 1 for i in input().split()])
    
for i in range(M):
    copyedge = edge[:i] + edge[i+1:] 
    ans += DFS(N, copyedge)
print(ans)

Submission Info

Judge Result