Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:20:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[nod].size();i++) { ^ user.cpp: In function ‘void dfst(int)’: user.cpp:32:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<t[nod].size();i++) { ^ user.cpp: In function ‘int main()’: user.cpp:79:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<sol[i].size();j++) { ^