Compilare: main.cpp: In function 'void dfs(int)': main.cpp:12:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<lista[node].size(); i++) ~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void solve2()': main.cpp:90:18: warning: unused variable 'sum' [-Wunused-variable] int nr=0,sum=0; ^~~ main.cpp: In function 'void solve3()': main.cpp:146:15: warning: unused variable 'nre' [-Wunused-variable] int nop=0,nre=0,nrt=0; ^~~