Compilare: user.cpp: In function ‘void dijkstra(int)’: user.cpp:24:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<g[x].size(); i++ ) ^ user.cpp: In function ‘int main()’: user.cpp:68:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<g[0].size(); ++i) ^ user.cpp:77:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<g[0].size(); ++i) ^