Compilare: main.cpp: In function 'void euler(int)': main.cpp:22:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < edges[node].size(); ++i ) { ~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:53:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < sol.size() - 1; ++i ) ~~^~~~~~~~~~~~~~~~