贪心 Codeforces Round #301 (Div. 2) A. Combination Lock

 1 /*
 2     贪心水题：累加到目标数字的距离，两头找取最小值
 3 */
 4 #include <cstdio>
 5 #include <iostream>
 6 #include <algorithm>
 7 #include <cstring>
 8 using namespace std;
 9 
10 const int MAXN = 1e3 + 10;
11 const int INF = 0x3f3f3f3f;
12 char s[MAXN], t[MAXN];
13 
14 int main(void)        //Codeforces Round #301 (Div. 2) A. Combination Lock
15 {
16     //freopen ("A.in", "r", stdin);
17 
18     int n;
19     while (scanf ("%d", &n) == 1)
20     {
21         scanf ("%s", &s);
22         getchar ();
23         scanf ("%s", &t);
24 
25         int ans = 0;
26         for (int i=0; i<n; ++i)
27         {
28             int tmp = abs (t[i]-s[i]);
29             ans += min (tmp, 10 - tmp);
30         }
31 
32         printf ("%d\n", ans);
33     }
34 
35     return 0;
36 }