题解 | 小红的字符串

#include <iostream>
using namespace std;
int GetCnt(char a, char b) {
    return min(abs((a-b+26)%26), abs((b-a+26)%26));
}
int main() {
    string data;
    cin >> data;
    auto mid = data.size()/2;
    int left, right;
    if(data.size() % 2 == 1) {
        left = mid - 1;
        right = mid + 1;
    } else {
        left = mid - 1;
        right = mid;
    }
    int n = 0;
    for(auto i = 0; i <= left; i++) {
        n += GetCnt(data[left-i], data[right+i]);
    }
    cout << n << endl;
}
// 64 位输出请用 printf("%lld")