Compilare: main.c: In function 'main': main.c:40:11: warning: variable 'elem' set but not used [-Wunused-but-set-variable] int i,elem=0; ^~~~ main.c:41:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n, &k); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:44:9: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &v[i]); ^~~~~~~~~~~~~~~~~~~~~~~~