Compilare: user.cpp: In function ‘int main()’: user.cpp:39:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<vec.size();++i) ^ user.cpp:36:16: warning: unused variable ‘m’ [-Wunused-variable] long long m=sol=n; ^ user.cpp: In function ‘long long int exp(long long int, long long int)’: user.cpp:16:1: warning: control reaches end of non-void function [-Wreturn-type] } ^