View Compilation Error

0_0_12226385_29758.cpp: In function `int main()':
0_0_12226385_29758.cpp:20: error: conversion from `__gnu_cxx::__normal_iterator<char*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >' to non-scalar type `__gnu_cxx::__normal_iterator<char*, std::vector<char, std::allocator<char> > >' requested
0_0_12226385_29758.cpp:20: error: no match for 'operator!=' in 'citer != (&s)->std::basic_string<_CharT, _Traits, _Alloc>::end [with _CharT = char, _Traits = std::char_traits<char>, _Alloc = std::allocator<char>]()'