Compilare: main.c: In function 'BFS': main.c:152:21: warning: variable 'a' set but not used [-Wunused-but-set-variable] int a; ^ main.c: In function 'main': main.c:167:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &n, &m); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:172:9: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d %d", &node1, &node2, &distance); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~