Compilare: user.cpp: In function ‘int main()’: user.cpp:63:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i>=0&&(ind[i]==poz[i].size()||(ind[i]<poz[i].size()&&k<poz[i][ind[i]]-sz+(sz-1-query(poz[i][ind[i]]))))) ^ user.cpp:63:64: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i>=0&&(ind[i]==poz[i].size()||(ind[i]<poz[i].size()&&k<poz[i][ind[i]]-sz+(sz-1-query(poz[i][ind[i]]))))) ^ user.cpp:51:10: warning: unused variable ‘x’ [-Wunused-variable] char x; ^ user.cpp: In function ‘char nextch()’: user.cpp:10:29: 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); ^