Merkkijono

#include <iostream>
#include <string>

int main(int argc, char* argv[])
{
	if(argc < 2)
		return 1;

	std::string str(argv[1]);
	int loop = 1;

	while(loop)
	{
		loop = 0;
		for(unsigned int i = 0; i < str.length(); i++)
		{
			char current = str[i];

			int j;
			for(j = 0; str[i + j] == current; j++);
			if(j > 1)
			{
				str.erase(i, j);
				loop = 1;
			}
		}
	}

	std::cout << str << std::endl;
}

Test 1

Verdict: RUNTIME ERROR

Test 2

Verdict: RUNTIME ERROR

Test 3

Verdict: RUNTIME ERROR

Test 4

Verdict: RUNTIME ERROR

Test 5

Verdict: RUNTIME ERROR

Test 6

Verdict: RUNTIME ERROR

Test 7

Verdict: RUNTIME ERROR

Test 8

Verdict: RUNTIME ERROR

Test 9

Verdict: RUNTIME ERROR

Test 10

Verdict: RUNTIME ERROR