ABC389题解（ABC）

比赛链接：Toyota Programming Contest 2025（AtCoder Beginner Contest 389)

A - 9x9

思路：模拟即可。

#include <bits/stdc++.h>
#define endl '\n'
#define rep(i, a, n) for (int i = a; i <= n; i++)
#define per(i, n, a) for (int i = n; i >= a; i--)
#define LL long long
#define IOS                  \
    ios::sync_with_stdio(0); \
    cin.tie(0);              \
    cout.tie(0);
using namespace std;

int main()
{
    IOS;
    string s;
    cin >> s;
    cout << (s[0] - '0') * (s[2] - '0');
    return 0;
}

B - tcaF

思路：模拟即可，记得开long long。

#include <bits/stdc++.h>
#define endl '\n'
#define rep(i, a, n) for (int i = a; i <= n; i++)
#define per(i, n, a) for (int i = n; i >= a; i--)
#defin