Compilare: user.c: In function ‘main’: user.c:15:17: warning: format ‘%d’ expects argument of type ‘int *’, but argument 4 has type ‘long long int *’ [-Wformat=] fscanf(fin, "%d%I64d", &cer, &A); ^ user.c:49:19: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘long long int’ [-Wformat=] fprintf(fout, "%I64d\n", sol[i]); ^ user.c:13:3: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d", &a, &b, &n); ^ user.c:15:5: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%I64d", &cer, &A); ^ user.c:31:24: warning: ‘k’ may be used uninitialized in this function [-Wmaybe-uninitialized] sol[i] = 1LL * k * (k - 1) / 2; ^