Codeforces Round #376 (Div. 2) A. Night at the Museum

题目链接：http://codeforces.com/contest/731/problem/A

#include <cstdio>
#include <iostream>

using namespace std;
char a[26];
int main()
{
string s;
for(int i = 0; i < 26; i++)
a[i] = 'a'+i;
while(cin >> s)
{
int cnts = 0;
int p = 0;
for(int i = 0; i < s.size(); i++)
{
char ch = s[i];
int tmp = 0;
if(a[p] == ch) continue;
else
{
p = (p+1)%26; tmp++;
while(a[p] != ch)
{
tmp++;
p = (p+1)%26;
}
cnts += min(tmp, 26-tmp);

}
}

printf("%d\n", cnts);

}
}