Compilare: main.c: In function 'main': main.c:83:13: warning: unused variable 'last' [-Wunused-variable] int last = 1, last_x = 0; ^~~~ main.c:74:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^~~~~~~~~~~~~~~~~~~~~ main.c:76:9: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &v[i]); ^~~~~~~~~~~~~~~~~~~~~~~~