Town center

from collections import deque

n, m = [int(x) for x  in input().split()]
roads = [[] for _ in range(n)]

for _ in range(m):
    a, b = [int(x) for x in input().split()]
    roads[a-1].append(b-1)
    roads[b-1].append(a-1)

def bfs(x):
    dist = [-1]*n
    dist[x] = 0
    q = deque([x])
    while q:
        node = q.popleft()
        for nei in roads[node]:
            if dist[nei] == -1:
                dist[nei] = dist[node]+1
                q.append(nei)
    return sum(dist)

min_sum = float('inf')
juction = -1

for i in range(n):
    total = bfs(i)
    if total < min_sum:
        min_sum = total
        juction = i

print(juction+1)

Test 1

Verdict: ACCEPTED

Test 2

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Test 3

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Test 4

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Test 48

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Verdict: ACCEPTED

Test 66

Verdict: ACCEPTED

Test 67

Verdict: ACCEPTED

Test 68

Verdict: ACCEPTED

Test 69

Verdict: ACCEPTED