Compilare: user.cpp: In function ‘void init()’: user.cpp:55:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i<G[1].size(); i++) ^ user.cpp: In function ‘void solve()’: user.cpp:71:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i<G[nod_nou].size(); ++i) ^ user.cpp: In function ‘void write()’: user.cpp:80:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i<sol.size(); i++) ^ user.cpp: In function ‘void read()’: user.cpp:39:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&m); ^ user.cpp:43:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&x,&y,&c); ^