Compilare: user.cpp: In function ‘int main()’: user.cpp:85:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=z[i]+1;j<=v[i].size();j++) ^ user.cpp: In function ‘unsigned int getint()’: user.cpp:34:40: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf,maxb,1,fin),ptr=0; ^ user.cpp:38:40: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf,maxb,1,fin),ptr=0; ^