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input/code.cpp: In function 'int main()':
input/code.cpp:10:30: warning: comparison of integer expressions of different signedness: 'size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   10 |         for (size_t i = 0; i < t; ++i)
      |                            ~~^~~

#include <iostream>
#include <sstream>
#include <vector>

int main(void)
{
	int t;
	std::cin >> t;
	std::vector<int> xx;
	for (size_t i = 0; i < t; ++i)
	{
		int x;
		std::cin >> x;
		xx.push_back(x);
	}

	for (int x : xx)
	{
		int pituus = 0;
		while (true)
		{
			pituus++;
			if (x == 1 || x < 0)
				break;
			if (x % 3 == 0)
				x /= 3;
			else
				x = x * 2 + 1;
		}
		if (x < 0)
			pituus = -1;
		std::cout << pituus << std::endl;
	}
}

Test 1

Verdict: TIME LIMIT EXCEEDED

Test 2

Verdict: TIME LIMIT EXCEEDED

Test 3

Verdict: ACCEPTED