Run ID 作者 问题 语言 测评结果 Time Memory 代码长度 提交时间
142588 傻逼小安 A+B 输入输出练习II C++ Compile Error 0 MS 0 KB 338 2026-01-11 14:32:52

Tests(0/0):

Code:

#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ string a,b; while(cin>a>>b){ cout<<a+b<<endl; } return 0; }

Run Info:

Main.cc: In function 'int main()':
Main.cc:9:16: error: no match for 'operator>>' (operand types are 'std::__cxx11::string {aka std::__cxx11::basic_string}' and 'std::__cxx11::string {aka std::__cxx11::basic_string}')
     while(cin>a>>b){
                ^
In file included from /usr/include/c++/5/string:53:0,
                 from /usr/include/c++/5/bits/locale_classes.h:40,
                 from /usr/include/c++/5/bits/ios_base.h:41,
                 from /usr/include/c++/5/ios:42,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 from Main.cc:1:
/usr/include/c++/5/bits/basic_string.tcc:1441:5: note: candidate: template std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)
     operator>>(basic_istream<_CharT, _Traits>& __in,
     ^
/usr/include/c++/5/bits/basic_string.tcc:1441:5: note:   template argument deduction/substitution failed:
Main.cc:9:18: note:   'std::__cxx11::string {aka std::__cxx11::basic_string}' is not derived from 'std::basic_istream<_CharT, _Traits>'
     while(cin>a>>b){
                  ^
In file included from /usr/include/c++/5/istream:934:0,
                 from /usr/include/c++/5/iostream:40,
                 from Main.cc:1:
/usr/include/c++/5/bits/istream.tcc:955:5: note: candidate: template std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, _CharT2*)
     operator>>(basic_istream<_CharT, _Traits>& __in, _CharT* __s)
     ^
/usr/include/c++/5/bits/istream.tcc:955:5: note:   template argument deduction/substitution failed:
Main.cc:9:18: note:   'std::__cxx11::string {aka std::__cxx11::basic_string}' is not derived from 'std::basic_istream<_CharT, _Traits>'
     while(cin>a>>b){
                  ^
In file included from /usr/include/c++/5/istream:934:0,
                 from /usr/include/c++/5/iostream:40,
                 from Main.cc:1:
/usr/include/c++/5/bits/istream.tcc:923:5: note: candidate: template std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, _CharT&)
     operator>>(basic_istream<_CharT, _Traits>& __in, _CharT& __c)
     ^
/usr/include/c++/5/bits/istream.tcc:923:5: note:   template argument deduction/substitution failed:
Main.cc:9:18: note:   'std::__cxx11::string {aka std::__cxx11::basic_string}' is not derived from 'std::basic_istream<_CharT, _Traits>'
     while(cin>a>>b){
                  ^
In file included from /usr/include/c++/5/iostream:40:0,
                 from Main.cc:1:
/usr/include/c++/5/istream:756:5: note: candidate: template std::basic_istream& std::operator>>(std::basic_istream&, unsigned char&)
     operator>>(basic_istream& __in, unsigned char& __c)
     ^
/usr/include/c++/5/istream:756:5: note:   template argument deduction/substitution failed:
Main.cc:9:18: note:   'std::__cxx11::string {aka std::__cxx11::basic_string}' is not derived from 'std::basic_istream'
     while(cin>a>>b){
                  ^
In file included from /usr/include/c++/5/iostream:40:0,
                 from Main.cc:1:
/usr/include/c++/5/istream:761:5: note: candidate: template std::basic_istream& std::operator>>(std::basic_istream&, signed char&)
     operator>>(basic_istream& __in, signed char& __c)
     ^
/usr/include/c++/5/istream:761:5: note:   template argument deduction/substitution failed:
Main.cc:9:18: note:   'std::__cxx11::string {aka std::__cxx11::basic_string}' is not derived from 'std::basic_istream'
     while(cin>a>>b){
                  ^
In file included from /usr/include/c++/5/iostream:40:0,
                 from Main.cc:1:
/usr/include/c++/5/istream:803:5: note: candidate: template std::basic_istream& std::operator>>(std::basic_istream&, unsigned char*)
     operator>>(basic_istream& __in, unsigned char* __s)
     ^
/usr/include/c++/5/istream:803:5: note:   template argument deduction/substitution failed:
Main.cc:9:18: note:   'std::__cxx11::string {aka std::__cxx11::basic_string}' is not derived from 'std::basic_istream'
     while(cin>a>>b){
                  ^
In file included from /usr/include/c++/5/iostream:40:0,
                 from Main.cc:1:
/usr/include/c++/5/istream:808:5: note: candidate: template std::basic_istream& std::operator>>(std::basic_istream&, signed char*)
     operator>>(basic_istream& __in, signed char* __s)
     ^
/usr/include/c++/5/istream:808:5: note:   template argument deduction/substitution failed:
Main.cc:9:18: note:   'std::__cxx11::string {aka std::__cxx11::basic_string}' is not derived from 'std::basic_istream'
     while(cin>a>>b){
                  ^
In file included from /usr/include/c++/5/iostream:40:0,
                 from Main.cc:1:
/usr/include/c++/5/istream:924:5: note: candidate: template std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&&, _Tp&)
     operator>>(basic_istream<_CharT, _Traits>&& __is, _Tp& __x)
     ^
/usr/include/c++/5/istream:924:5: note:   template argument deduction/substitution failed:
Main.cc:9:18: note:   'std::__cxx11::string {aka std::__cxx11::basic_string}' is not derived from 'std::basic_istream<_CharT, _Traits>'
     while(cin>a>>b){
                  ^