Compilare: main.cpp: In function 'void findNumbers(std::vector<int>&, int, std::vector<std::vector<int> >&, std::vector<int>&, int)': main.cpp:16:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < ar.size() && sum - ar[i] >= 0) { ~~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:62:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < res.size(); i++) { ~~^~~~~~~~~~~~ main.cpp:65:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < res[i].size(); j++) ~~^~~~~~~~~~~~~~~