Compilare: user.cpp: In function ‘int read_int()’: user.cpp:76:9: warning: variable ‘sgn’ set but not used [-Wunused-but-set-variable] int sgn=1; ^ user.cpp: In function ‘void dfs(int)’: user.cpp:96:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<graf[nod].size();i++) ^ user.cpp: In function ‘void dfrs(int)’: user.cpp:108:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<graf_transpus[nod].size();i++) ^ user.cpp: In function ‘char read_ch()’: user.cpp:66:34: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(in_buff,1,4096,fin); ^