Compilare: main.c: In function 'main': main.c:57:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &nodes, &edges); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:59:9: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &x, &y); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c: In function 'max_array': main.c:32:10: warning: 'max_pos' may be used uninitialized in this function [-Wmaybe-uninitialized] array[max_pos] = 0; ^ main.c: In function 'main': main.c:32:10: warning: 'max_pos' may be used uninitialized in this function [-Wmaybe-uninitialized] array[max_pos] = 0; ^ main.c:25:18: note: 'max_pos' was declared here int max = 0, max_pos; ^~~~~~~