Compilare: main.c: In function 'main': main.c:11:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &t); ^~~~~~~~~~~~~~~~~~~~~ main.c:21:9: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &n, &k); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:14:17: warning: iteration 999998 invokes undefined behavior [-Waggressive-loop-optimizations] if (ciur[d] == 0){ ~~~~^~~ main.c:13:5: note: within this loop for (d = 2; d <= 1000000; d++){ ^~~