Compilare: main.cpp: In function 'void bkt(int, int, ll)': main.cpp:15:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(id==p.size()) ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:36:37: 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:37:39: 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); ^