[蓝桥杯 2013 省 AB] 错误票据

蓝桥杯，都知道吧 

[蓝桥杯 2013 省 AB] 错误票据(抱歉是图片形式)

Python解决程序

n = int(input())
ids = []
for i in range(n):
    line = list(map(int, input().split()))
    ids.extend(line)
ids.sort()
missing = 0
duplicate = 0
for j in range(len(ids) - 1):
    if ids[j + 1] - ids[j] == 2:
        missing = ids[j] + 1
    elif ids[j + 1] - ids[j] == 0:
        duplicate = ids[j]
print(missing, duplicate)