Compile error: /storage/emulated/0/Download/cppcompiler/CPPProject/彩色球/src/Main.cpp: In function 'std::__ndk1::string* arr3(int*)':
/storage/emulated/0/Download/cppcompiler/CPPProject/彩色球/src/Main.cpp:77:19: error: cannot convert 'std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >' to 'std::__ndk1::string*' {aka 'std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >*'} in return
return sa.str();
^
/storage/emulated/0/Download/cppcompiler/CPPProject/彩色球/src/Main.cpp:77:19: error: cannot convert 'std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >' to 'std::__ndk1::string*' {aka 'std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >*'} in return
return sa.str();
^