Compilare: main.cpp: In function 'void Solve()': main.cpp:23:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a.size(); ++ i ) { ~~^~~~~~~~~~ main.cpp:29:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < a.size(); ++ i ) { ~~^~~~~~~~~~ main.cpp:40:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = a.size(); i < b.size(); ++ i ) { ~~^~~~~~~~~~