Run id: 499

Main.cc: In function 'std::string zh(std::string)':
Main.cc:6:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<a.size();i++){
                          ^
Main.cc:10:60: error: lvalue required as left operand of assignment
         if(a[i]=='a'||a[i]=='e'||a[i]=='i'||a[i]=='o'||a[i]='u'){
                                                            ^