Compilare: main.cpp:22:8: warning: first argument of 'int main(long long int, const char**)' should be 'int' [-Wmain] signed main(int argc, const char * argv[]) { ^~~~ main.cpp: In function 'int main(long long int, const char**)': main.cpp:25:27: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%lld\n", &m) ; ^