ERRATA CORRIGE
codice:
for(j = N*M - 1, change = false; j > 0; j--) {
		for(k = 0; k < j; k++) {
			if(p_mat[k] > p_mat[k+1]) {
				tmp = p_mat[k];
				p_mat[k] = p_mat[k+1];
				p_mat[k+1] = tmp;
				change = true;
			}
		}
		if(!change) break;
	}
codice:
for(j = N*M - 1, change = false; j > 0; j--) {
		change = false;
		for(k = 0; k < j; k++) {
			if(p_mat[k] > p_mat[k+1]) {
				tmp = p_mat[k];
				p_mat[k] = p_mat[k+1];
				p_mat[k+1] = tmp;
				change = true;
			}
		}
		if(!change) break;
	}