阿里4.15笔试

if __name__ == "__main__":
    n = int(sys.stdin.readline().strip())
    line = sys.stdin.readline().strip()
    values = list(map(int, line.split()))
    values.sort()
    res = []
    tag = 1  for i in range(len(values)): if tag == 1:
            res.append(values.pop(-1))
            tag = 0  elif tag == 0:
            res.append(values.pop(0))
            tag = 1  sum = 0  for i in range(len(res)): if i == 0:
            sum += abs(res[i] - res[1])
            sum += abs(res[i] - res[-1]) elif i == len(res) - 1:
            sum += abs(res[i]-res[0])
            sum += abs(res[i]-res[i-1]) else:
            sum += abs(res[i]-res[i-1])
            sum += abs(res[i] - res[i+1]) print(sum//2) for i in res: print(str(i)+' ', end='')

if __name__ == "__main__":
    n = int(sys.stdin.readline().strip())
    values = [] for i in range(n):
        line = sys.stdin.readline().strip()
        value = list(map(int, line.split()))
        values.append(value)
    min_vals = [] for x1, y1 in values: for x2, y2 in values: if x1 == x2 and y1 == y2: continue  X = (x1 + x2)/2.0  Y = (y1 + y2)/2.0  min_val = min(X, Y)
            min_vals.append(min_val) print('%.1f'%max(min_vals))