My template:

#include <bits/stdc++.h>
using namespace std;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

// #pragma GCC optimize("O3,unroll-loops")
// #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")

#define Jungle "hkr"
#define getbit(x, i) (((x) >> (i)) & 1)
#define cntbit __builtin_popcount
#define _(x) ((x) & -(x))
#define MASK(x) (1 << (x))
#define MULTEST \
    int nq;     \
    cin >> nq;  \
    while (nq--)

template < typename T >
void chkmin(T &a, T b)
{
    if (a > b)
        a = b;
}

template < typename T >
void chkmax(T &a, T b)
{
    if (a < b)
        a = b;
}

const int mod = 1e9 + 7;

int add(int x, int y)
{
    return (1ll * x + y) % mod;
}

int sub(int x, int y)
{
    return (1ll * x - y + mod) % mod;
}

int mul(int x, int y)
{
    return 1ll * x * y % mod;
}

void init(void)
{
}

void solve(void)
{
    init();
}

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(nullptr);
    cout.tie(nullptr);

    if (fopen(Jungle ".inp", "r"))
    {
        freopen(Jungle ".inp", "r", stdin);
        freopen(Jungle ".out", "w", stdout);
    }

    // MULTEST
    solve();

    // cerr << "\nTime elapsed: " << 1000 * clock() / CLOCKS_PER_SEC << "ms\n";

    return 0;
}

hkr