Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:23:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<nod[pos].size();i++) ~^~~~~~~~~~~~~~~~ main.cpp: In function 'void go_visit(int, int, int, int)': main.cpp:44:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<nod[pos].size();i++) ~^~~~~~~~~~~~~~~~ main.cpp:41:10: warning: variable 'ok' set but not used [-Wunused-but-set-variable] bool ok=true; ^~ main.cpp: In function 'void get_ans()': main.cpp:82:9: warning: unused variable 'p1' [-Wunused-variable] int p1=path[x]; ^~ main.cpp:83:9: warning: unused variable 'p2' [-Wunused-variable] int p2=path[y]; ^~