Compilare: main.cpp: In function 'int main()': main.cpp:26:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ans + step < vals[x].size() && vals[x][ans + step].second > aux) ~~~~~~~~~~~^~~~~~~~~~~~~~~~ main.cpp:29:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ans < vals[x].size()) { ~~~~^~~~~~~~~~~~~~~~