简陋板子

#pragma GCC optimize("O2")
#include <bits/stdc++.h>

#define ll long long
const ll mod = 1000000007;

using namespace std;

inline void read(unsigned long long &a) {
    a = 0;
    char c;
    while ((c = getchar()) < 48);
    do a = a * 10 + (c ^ 48);
    while ((c = getchar()) > 47);
}//a <= 2^64

int main() {
    //os::sync_with_stdio(false);
    //cin.tie(nullptr);
    
    return 0;
}

施工