Compilare: user.cpp: In function ‘void lee(int)’: user.cpp:46:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k<A[el].size();k++) ^ user.cpp: In function ‘int main()’: user.cpp:80:31: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘long int’ [-Wformat=] fprintf(fout,"%d",costf[y]); ^ user.cpp: In function ‘char nextch()’: user.cpp:22:30: 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,MAXBUF,fi); ^