Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:21:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int ii=0;ii<m[x].size();ii++){ ~~^~~~~~~~~~~~ user.cpp: In function ‘int calcul()’: user.cpp:32:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:36:15: warning: unused variable ‘c’ [-Wunused-variable] int n,x,y,c; ^