Compilare: main.cpp: In function 'bool Aexists(std::vector<std::pair<int, int> >, std::pair<int, int>)': main.cpp:18:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<ell.size();i++) ~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:154:23: warning: 'jj' may be used uninitialized in this function [-Wmaybe-uninitialized] ki<<ii+1<<" "<<jj+1<<endl; ^ main.cpp:154:15: warning: 'ii' may be used uninitialized in this function [-Wmaybe-uninitialized] ki<<ii+1<<" "<<jj+1<<endl; ^~~