string容器操作真好用

#include<bits/stdc++.h>

using namespace std;

string s, temp, ans;

int main() {

cin >> s;

for (int i = 0; i < s.size(); i++) {

temp.push_back(s[i]);

int num = stoi(temp);

if (num > 26) {

temp.pop_back();

num = stoi(temp);

ans.push_back(num + 'A' - 1);

temp.clear();

temp.push_back(s[i]);

}

}

if (!temp.empty()) {

int num = stoi(temp);

ans.push_back(num + 'A' - 1);

}

cout << ans;

return 0;

}