Compilare: user.cpp: In function ‘int main()’: user.cpp:13:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d%d", &n, &k); ^ user.cpp:15:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d", &p[i]); ^ user.cpp:12:54: warning: ‘frontier_dr’ may be used uninitialized in this function [-Wmaybe-uninitialized] int n, k, i, d, in, st, dr, sol, mij, frontier_st, frontier_dr; ^~~~~~~~~~~ user.cpp:64:91: warning: ‘frontier_st’ may be used uninitialized in this function [-Wmaybe-uninitialized] else if (frontier_st == 0 || abs (p[i] - p[frontier_dr]) < abs (p[i] - p[frontier_st])) { ~~~~~~~~~~~~~^