@[panrong](/user/1044970) 和楼主差不多，请问楼主知道问题出在哪里吗，我的代码如下
```
#include <iostream>
#include <string>
using namespace std;
int hw(string a) {
int l = a.size();
for (int i = 0; i < l / 2; i++) {
if (a[i] != a[l - 1 - i]) {
return 0;
}
}
return 1;
}
string add(string a, string b, int jz) {
int l1 = a.size(), l2 = b.size();
if (l1 > l2) {
b = string(l1 - l2, '0') + b;
}
if (l1 < l2) {
a = string(l2 - l1, '0') + a;
}
int cf = 0, temp = 0;
string c;
int f = max(l1, l2);
for (int i = 0; i < f; i++) {
temp = a[f - 1 - i] + b[f - 1 - i] + cf - 2 * '0';
cf = temp / jz;
temp %= jz;
c = char(temp + '0') + c;
}
if (cf != 0) {
c = char(cf + '0') + c;
}
return c;
}
string change(string a) {
string b;
for (int i = a.size() - 1; i >= 0; i--) {
b += a[i];
}
return b;
}
int main() {
int k;
string a;
cin >> k >> a;
int step = 0;
do {
if (hw(a)) {
cout << step;
return 0;
}
a = add(a, change(a), k);
step++;
} while (step <= 30);
cout << "Impossible!";
return 0;
}
by Faded_wind123 @ 2024-04-14 00:13:55