Compilare: main.cpp: In function 'int main()': main.cpp:30:10: warning: unused variable 'ok' [-Wunused-variable] bool ok; ^~ main.cpp:17:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&n); ^ main.cpp:19:26: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&a); ^