Compilare: main.cpp: In function 'void solve()': main.cpp:59:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<sol_ext.size();i++) ~^~~~~~~~~~~~~~~ main.cpp:61:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<sol_int.size();i++) ~^~~~~~~~~~~~~~~