Compilare: user.cpp: In function ‘void dij()’: user.cpp:61:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[start].size();i++) ^ user.cpp: In function ‘void dfs(int)’: user.cpp:77:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<ad [ x ].size();i++) ^ user.cpp:84:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<q[ x ].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:116:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[ x ].size();j++) ^