Compilare: main.cpp: In function 'void dfs(int)': main.cpp:12:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j <vec[nod].size(); j++) ~~^~~~~~~~~~~~~~~~ main.cpp:13:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation] if(viz[vec[nod][j]] == false) ^~ main.cpp:15:13: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if' postord[++nr]=nod; ^~~~~~~