sicily 1035. DNA matching

 1 #include<iostream>
 2 #include<cstdio>
 3 #include<string>
 4 #include<algorithm>
 5 using namespace std;
 6
 7 bool cmp(string a, string b);
 8 bool match(string a, string b);
 9
10
11 int main(void) {
12     int testSize, couple;
13     string str[101];
14     int len[101];
15     bool used[101];
16
17     // for each test case: (t<=20)
18     cin >> testSize;
19     while(testSize--) {
20         // scan and store n strings(n <= 100)
21         cin >> couple;
22         for (int i = 0; i < couple; ++i) {
23             cin >> str[i];
24         }
25
26         // sort by length
27         sort(str, str + couple, cmp);
28         //sort(<#_RandomAccessIterator __first#>, <#_RandomAccessIterator __last#>, <#_Compare __comp#>)
29
30         for (int i = 0; i < couple; ++i) {
31             // store length
32             len[i] = str[i].size();
33             // init used
34             used[i] = false;
35         }
36
37         int count = 0;
38
39         for (int i = 0; i < couple; ++i) {
40             if (!used[i]) {
41                 for (int j = i + 1; j < couple && len[j] == len[i]; ++j) {
42                     if (match(str[i], str[j]) && !used[j]) {
43                         count++;
44                         used[i] = used[j] = true;
45                         break;
46                     }
47                 }
48             }
49         }
50
51         cout << count << ‘\n‘;
52     }
53
54     return 0;
55 }
56
57 bool cmp(string a,string b)
58 {
59     return a.size() > b.size();
60 }
61 bool match(string a,string b){
62     int len = a.size();
63     for (int i = 0; i<len; i++) {
64         if (a[i] == ‘A‘ && b[i] != ‘T‘)
65             return false;
66         if (a[i] == ‘T‘ && b[i] != ‘A‘)
67             return false;
68         if (a[i] == ‘C‘ && b[i] != ‘G‘)
69             return false;
70         if (a[i] == ‘G‘ && b[i] != ‘C‘)
71             return false;
72     }
73     return true;
74 }