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View Compilation Error

0_0_15657571_12154.cpp: In function 'int main(int, char**)':
0_0_15657571_12154.cpp:19:15: error: invalid user-defined conversion from 'char' to 'std::map<std::basic_string<char>, int>::key_type&& {aka std::basic_string<char>&&}' [-fpermissive]
        mp[a[i]]++;
               ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_15657571_12154.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:495:7: note: candidate is: std::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>] <near match>
       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc());
       ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:495:7: note:   no known conversion for argument 1 from 'char' to 'const char*'
0_0_15657571_12154.cpp:19:15: error: invalid conversion from 'char' to 'const char*' [-fpermissive]
        mp[a[i]]++;
               ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_15657571_12154.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:495:7: note: initializing argument 1 of 'std::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]'
       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc());
       ^
0_0_15657571_12154.cpp:19:15: error: conversion to non-const reference type 'std::map<std::basic_string<char>, int>::key_type&& {aka class std::basic_string<char>&&}' from rvalue of type 'std::basic_string<char>' [-fpermissive]
        mp[a[i]]++;
               ^
0_0_15657571_12154.cpp:22:17: error: invalid user-defined conversion from 'char' to 'std::map<std::basic_string<char>, int>::key_type&& {aka std::basic_string<char>&&}' [-fpermissive]
       if(mp[a[i]]>max)
                 ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_15657571_12154.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:495:7: note: candidate is: std::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>] <near match>
       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc());
       ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:495:7: note:   no known conversion for argument 1 from 'char' to 'const char*'
0_0_15657571_12154.cpp:22:17: error: invalid conversion from 'char' to 'const char*' [-fpermissive]
       if(mp[a[i]]>max)
                 ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_15657571_12154.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:495:7: note: initializing argument 1 of 'std::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]'
       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc());
       ^
0_0_15657571_12154.cpp:22:17: error: conversion to non-const reference type 'std::map<std::basic_string<char>, int>::key_type&& {aka class std::basic_string<char>&&}' from rvalue of type 'std::basic_string<char>' [-fpermissive]
       if(mp[a[i]]>max)
                 ^
0_0_15657571_12154.cpp:24:20: error: invalid user-defined conversion from 'char' to 'std::map<std::basic_string<char>, int>::key_type&& {aka std::basic_string<char>&&}' [-fpermissive]
         max=mp[a[i]];
                    ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_15657571_12154.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:495:7: note: candidate is: std::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>] <near match>
       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc());
       ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:495:7: note:   no known conversion for argument 1 from 'char' to 'const char*'
0_0_15657571_12154.cpp:24:20: error: invalid conversion from 'char' to 'const char*' [-fpermissive]
         max=mp[a[i]];
                    ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_15657571_12154.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:495:7: note: initializing argument 1 of 'std::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]'
       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc());
       ^
0_0_15657571_12154.cpp:24:20: error: conversion to non-const reference type 'std::map<std::basic_string<char>, int>::key_type&& {aka class std::basic_string<char>&&}' from rvalue of type 'std::basic_string<char>' [-fpermissive]
         max=mp[a[i]];
                    ^


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