Compilare: user.cpp: In function ‘int solve()’: user.cpp:32:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int a=0; a<v.size(); a++) ^ user.cpp:33:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int b=a+1; b<v.size(); b++) ^ user.cpp:36:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int a=0; a<v.size(); a++) obtained.push_back(actualEnter[a]); ^ user.cpp:47:1: warning: control reaches end of non-void function [-Wreturn-type] } ^