class UnionFind: def __init__(self, size): self.table = [-1 for _ in range(size)] def find(self, x): group = [] while self.table[x] >= 0: group.append(x) x = self.table[x] for g in group: self.table[g] = x return x def union(self, x, y): s1 = self.find(x) s2 = self.find(y) if s1 != s2: if self.table[s1] >= self.table[s2]: self.table[s1] += self.table[s2] self.table[s2] = s1 else: self.table[s2] += self.table[s1] self.table[s1] = s2 return self.table[s1] def distance2(px, py, qx, qy): return (px - qx) * (px - qx) + (py - qy) * (py - qy) def acceptable(lenght): l = lenght * lenght uf = UnionFind(N) for i in range(N-1): for j in range(i+1,N): if D[i][j] <= l: uf.union(i, j) return uf.find(0) == uf.find(N - 1) N = int(input()) P = [] for i in range(N): x, y = map(int, input().split()) P.append((x, y)) D = [[0] * N for i in range(N)] for i in range(N-1): for j in range(i+1,N): D[i][j] = distance2(P[i][0], P[i][1], P[j][0], P[j][1]) D[j][i] = D[i][j] lower_limit = 0 upper_limit = D[0][N-1] while lower_limit < upper_limit: mid = (lower_limit + upper_limit) // 2 if acceptable(mid): upper_limit = mid else: lower_limit = mid + 1 print(lower_limit, upper_limit) if lower_limit % 10 > 0: lower_limit = lower_limit // 10 * 10 + 10 print(lower_limit)