POJ 2840

 1 #include<iostream>
 2 #include<stdio.h>
 3 #include<string>
 4 
 5 using namespace std;
 6 
 7 int main()
 8 {
 9     //freopen("acm.acm","r",stdin);
10     int i;
11     int num;
12     int sum;
13     string s;
14     cin>>num;
15     while(num --)
16     {
17     cin>>s;
18     i = 0;
19     sum = 0;
20     while(1)
21     {
22         sum += s[i] - ‘0‘;
23         if(s[++i] != ‘:‘)
24             sum *= 10;
25         else
26             break;
27     }
28      
29     if(s[++i] == ‘0‘ && s[++i] == ‘0‘)
30     {
31         if(sum == 12)
32             cout<<24<<endl;
33         else
34             cout<<(sum + 12) % 24<<endl;
35     }
36     else
37     {
38         cout<<0<<endl;
39     }
40 
41     }
42 }