Compilare: user.cpp: In function ‘void sort_top(int)’: user.cpp:33:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[nod].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:62:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<V[top[i]].size();j++) ^ user.cpp:39:13: warning: variable ‘k’ set but not used [-Wunused-but-set-variable] int n,m,k,i,A,B,max,j,p; ^ user.cpp: In function ‘char nextch()’: user.cpp:15:31: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf,1,MAX_BUF,fi); ^