Compilare: main.cpp: In function 'long long int solve(long long int, long long int)': main.cpp:39:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long long j = 0; j < mu.size(); j++) ~~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:61:15: warning: unused variable 'm' [-Wunused-variable] long long m, a, b; ^ main.cpp:57:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("frac.in", "r", stdin); ^ main.cpp:58:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("frac.out", "w", stdout); ^ main.cpp:62:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld", &a, &b); ^