Compilare: main.cpp: In function 'int main()': main.cpp:73:13: warning: unused variable 'm1' [-Wunused-variable] int x,y,m1,m2,lca,lo; ^~ main.cpp:73:16: warning: unused variable 'm2' [-Wunused-variable] int x,y,m1,m2,lca,lo; ^~ main.cpp:73:19: warning: unused variable 'lca' [-Wunused-variable] int x,y,m1,m2,lca,lo; ^~~ main.cpp:73:23: warning: unused variable 'lo' [-Wunused-variable] int x,y,m1,m2,lca,lo; ^~ main.cpp: In function 'void dfs(int, int)': main.cpp:186:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<g[start].size();i++) ~^~~~~~~~~~~~~~~~