Compilare: user.cpp: In function ‘int Union(int, int)’: user.cpp:57:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘void getEuler(int, int, int)’: user.cpp:77:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[node].size();i++) ^ user.cpp: In function ‘int getRoad(int)’: user.cpp:121:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<G[i].size();j++) ^ user.cpp:131:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘char nextch()’: user.cpp:12:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, BUF_SIZE, 1, fi); ^