Compilare: user.cpp: In function ‘void dijkstra()’: user.cpp:49:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[start].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:126:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(idx=0;idx<v[start].size();idx++) ^ user.cpp:168:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(idx=0;idx<l[start].size();idx++) ^ user.cpp:100:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("termite.out","w",stdout); ^