Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:15:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[varf].size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:34:24: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(st[a]<st[b] && dr[a]>dr[b] || st[b]<st[a] && dr[b]>dr[a]) ^ user.cpp:22:13: warning: unused variable ‘x’ [-Wunused-variable] int a,b,x,y,lug,k,sol; ^ user.cpp:22:15: warning: unused variable ‘y’ [-Wunused-variable] int a,b,x,y,lug,k,sol; ^ user.cpp:22:17: warning: unused variable ‘lug’ [-Wunused-variable] int a,b,x,y,lug,k,sol; ^ user.cpp:22:21: warning: unused variable ‘k’ [-Wunused-variable] int a,b,x,y,lug,k,sol; ^ user.cpp:22:23: warning: unused variable ‘sol’ [-Wunused-variable] int a,b,x,y,lug,k,sol; ^