Compilare: user.cpp: In function ‘void dijkstra(int)’: user.cpp:56:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( j = 0 ; j < graf[nod].size() ; j++ ) ^ user.cpp: In function ‘int main()’: user.cpp:76:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0 ; i <= fort.size() ; i++ ) ^ user.cpp:89:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0 ; i < retin.size() ; i++ ) ^