Compilare: user.cpp: In function ‘void add(std::vector<int>&, std::vector<int>)’: user.cpp:32:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i<a.size())q+=a[i]; ^ user.cpp:33:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i<b.size())q+=b[i]; ^ user.cpp:28:9: warning: unused variable ‘q’ [-Wunused-variable] int q=vtn(a),qq=vtn(b),qqq; ^ user.cpp:28:18: warning: unused variable ‘qq’ [-Wunused-variable] int q=vtn(a),qq=vtn(b),qqq; ^ user.cpp:28:28: warning: variable ‘qqq’ set but not used [-Wunused-but-set-variable] int q=vtn(a),qq=vtn(b),qqq; ^ user.cpp: In function ‘void sub(std::vector<int>&, std::vector<int>)’: user.cpp:46:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i<b.size())q-=b[i]; ^ user.cpp: In function ‘int main()’: user.cpp:80:17: warning: unused variable ‘q’ [-Wunused-variable] int q=vtn(num),qq=vtn(dp[j][i]); ^ user.cpp:80:28: warning: unused variable ‘qq’ [-Wunused-variable] int q=vtn(num),qq=vtn(dp[j][i]); ^