题解 | #23年OPPO-a的翻转#

#include<bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<ll, ll>PII;
const int N = 5e5 + 10;
const int MOD = 998244353;
const int INF = 0X3F3F3F3F;
const int dx[] = {-1, 1, 0, 0, -1, -1, +1, +1};
const int dy[] = {0, 0, -1, 1, -1, +1, -1, +1};
const int M = 1e6 + 10;

int main()
{
	ll a;
	cin >> a;
	string b = to_string(a);
    ll res = 1;
	for(int i = 0; i < b.size(); i ++)
	{
		a += (ll)(b[i] - '0') * res;
		res *= 10;
	}
	cout << a << endl;
}