Compilare: main.cpp: In function 'void solve()': main.cpp:101:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k<sol[0].size()-1 && a[0][sol[0][k]] < a[1][sol[1][b]]) ~^~~~~~~~~~~~~~~~ main.cpp:109:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if ( b < sol[1].size()-1 ) ~~^~~~~~~~~~~~~~~~~