Compilare: main.cpp: In function 'bool check(int, int)': main.cpp:75:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(edg[x].size() < gr[x]) ~~~~~~~~~~~~~~^~~~~~~ main.cpp:81:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(edg[y].size() < gr[y]) ~~~~~~~~~~~~~~^~~~~~~ main.cpp:87:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(edg[x].size() != gr[x]) return 0; ~~~~~~~~~~~~~~^~~~~~~~ main.cpp:88:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(edg[y].size() != gr[y]) return 0; ~~~~~~~~~~~~~~^~~~~~~~