Compilare: user.cpp: In function ‘void dfs_topologic(int)’: user.cpp:33:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < succ[nod].size(); i++) ~~^~~~~~~~~~~~~~~~~~ user.cpp: In function ‘void dfs2(int)’: user.cpp:49:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < pred[nod].size(); i++) ~~^~~~~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:79:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < cc[i].size(); j++) ~~^~~~~~~~~~~~~~