BC42 小乐乐定闹钟

思路：

step1：输入起始时刻和分钟数，用空格隔开；

step2：分别求得计算过之后的时和分，注意循环和进位；

step3：格式化输出打印，注意限定条件；

代码如下：

n = input().split(' ')
m = n[1]

q = n[0]
q = q.split(':')

p = int(q[0])
e = int(q[1])

minute = (int(m)%60 + e)%60
hour1 = (int(m)%60 + e)//60
hour = (int(m)//60 + p + hour1)%24

if hour < 10 and minute < 10:
    print('0{}:0{}'.format(hour,minute))
elif hour < 10 and minute > 10:
    print('0{}:{}'.format(hour,minute))
elif hour >10 and minute < 10:
    print('{}:{}0'.format(hour,minute))
elif hour > 10 and minute > 10:
    print('{}:{}'.format(hour,minute))