Compilare: main.cpp: In function 'int main()': main.cpp:100:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < ans.size(); ++i){ ~~^~~~~~~~~~~~ main.cpp:102:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < vv.size() && ok; ++i){ ~~^~~~~~~~~~~ main.cpp:103:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = i + 1; j < vv.size(); ++j){ ~~^~~~~~~~~~~