Compilare: user.cpp: In function ‘int check(int, std::vector<int>, std::vector<int>)’: user.cpp:39:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=it;i<v1.size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:70:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<pr.size();++i) ^ user.cpp:84:23: warning: left operand of comma operator has no effect [-Wunused-value] for (int k=0;k<vl,int(pr.size());++k) ^ user.cpp:97:27: warning: left operand of comma operator has no effect [-Wunused-value] for (int k=0;k<vl,int(pr.size());++k) ^