the process was closed because the signal was 611 c

I think the main issue is that you are doing int *used = new int(p_n);, this will create a pointer to an integer that has initial value equal to p_n. But, the problem comes here: used[i_used]=p_arr[i][1]; — this may lead to a segmentation fault, as you may end up using memory outside the valid bounds.

I’m not sure about the algorithm, but based on the code, I think you should use this instead:

used = new int[p_n]; // assuming p_n > 0

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