Compilare: main.cpp: In function 'void calc(int)': main.cpp:14:8: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;l<divi.size();l++) ~^~~~~~~~~~~~ main.cpp:13:12: warning: unused variable 'cur' [-Wunused-variable] long long cur=divi[x]; ^~~ main.cpp: In function 'long long int go(int, int)': main.cpp:29:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<v[cur].size();i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'void build(int, int, long long int)': main.cpp:42:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<v[cur].size();i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:73:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<divi.size();i++) ~^~~~~~~~~~~~ main.cpp:60:30: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("desc.in","r",stdin); freopen("desc.out","w",stdout); ^ main.cpp:60:62: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("desc.in","r",stdin); freopen("desc.out","w",stdout); ^