初始文件

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单组输入

#include <bits/stdc++.h>

using f64 = double;
using i64 = std::int64_t;

// END OF HEADER | Author: Roger Young

int main() {
	std::cin.tie(nullptr)->sync_with_stdio(false);
	std::cout << "X" << '\n';
	return 0;
}

多组输入

#include <bits/stdc++.h>

using f64 = double;
using i64 = std::int64_t;

// END OF HEADER | Author: Roger Young

void solve() {
	std::cout << "X" << '\n';
}

int main() {
	std::cin.tie(nullptr)->sync_with_stdio(false);
	int T;
	std::cin >> T;
	while (T--)
		solve();
	return 0;
}

LeetCode

#include <bits/stdc++.h>

using f64 = double;
using i64 = std::int64_t;

int ____ = std::cin.tie(nullptr)->sync_with_stdio(false);

// END OF HEADER | Author: Roger Young