Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:40:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < graf[cnod].size(); ++i) ~~^~~~~~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:75:9: warning: this ‘while’ clause does not guard... [-Wmisleading-indentation] while(st.size()); ^~~~~ user.cpp:76:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘while’ { ^