Compilare: main.cpp: In function 'std::vector<int> add(std::vector<int>&, std::vector<int>&)': main.cpp:25:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i < vec2.size()) { sum += vec2[i]; } ~~^~~~~~~~~~~~~ main.cpp:26:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i < vec1.size()) { sum += vec1[i]; } ~~^~~~~~~~~~~~~ main.cpp: In function 'void multiply(std::vector<int>&, long int)': main.cpp:40:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i < res.size();i++) { ~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:61:17: warning: unused variable 'x' [-Wunused-variable] long int A, B, x, y; ^ main.cpp:61:20: warning: unused variable 'y' [-Wunused-variable] long int A, B, x, y; ^