Compilare: main.cpp: In function 'void solve1(int)': main.cpp:36:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<graph[nod].size();++i) ~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'void solve2()': main.cpp:62:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<graph[nod].size();++i) ~^~~~~~~~~~~~~~~~~~