Compilare: main.cpp: In function 'void euler(int)': main.cpp:39:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = start[node]; i < edges[node].size(); ++i ) ~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:149:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < sol.size(); ++i ) ~~^~~~~~~~~~~~ main.cpp:144:34: warning: 'solY' may be used uninitialized in this function [-Wmaybe-uninitialized] fout << solX << ' ' << solY << ' ' << ans - 1; ^~~ main.cpp:144:19: warning: 'solX' may be used uninitialized in this function [-Wmaybe-uninitialized] fout << solX << ' ' << solY << ' ' << ans - 1; ^~~