Compilare: user.cpp: In function ‘void dijkstra()’: user.cpp:21:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0 ; i< forts.size(); i++) ^ user.cpp:48:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < forts.size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:53:13: warning: unused variable ‘z’ [-Wunused-variable] int x,y,z,c,i,k; ^