网易笔试-时钟

try:
    while True:
        #python 字符串为只读类型,借助helper
        def helper(time, scale):
            # 如果小时，分钟，秒分别大于'23'、'59'、'59'，则置高位为'0'
            temp = []
            if time > scale:
                temp = list(time)
                temp[0] = '0'
                return ''.join(temp)
            else:
                return time
                
        T = int(input())
        while T > 0:
            t = input()
            time = t.split(':')
            res = []
            res.append(helper(time[0],'23'))
            res.append(helper(time[1],'59'))
            res.append(helper(time[2],'59'))
            
            print(':'.join(res))
            
            T -= 1
            
except:
    pass