运行 ID: 12310

Main.cc: In function ‘int main()’:
Main.cc:9:9: error: no match for ‘operator<<’ (operand types are ‘std::ostream’ {aka ‘std::basic_ostream’} and ‘void’)
    9 |     cout<

} In file included from /usr/include/c++/9/istream:39, from /usr/include/c++/9/sstream:38, from /usr/include/c++/9/complex:45, from /usr/include/c++/9/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54, from Main.cc:1: /usr/include/c++/9/ostream:108:7: note: candidate: ‘std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_ostream<_CharT, _Traits>::__ostream_type& (*)(std::basic_ostream<_CharT, _Traits>::__ostream_type&)) [with _CharT = char; _Traits = std::char_traits; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream]’ 108 | operator<<(__ostream_type& (*__pf)(__ostream_type&)) | ^~~~~~~~ /usr/include/c++/9/ostream:108:36: note: no known conversion for argument 1 from ‘void’ to ‘std::basic_ostream::__ostream_type& (*)(std::basic_ostream::__ostream_type&)’ {aka ‘std::basic_ostream& (*)(std::basic_ostream&)’} 108 | operator<<(__ostream_type& (*__pf)(__ostream_type&)) | ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~ /usr/include/c++/9/ostream:117:7: note: candidate: ‘std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_ostream<_CharT, _Traits>::__ios_type& (*)(std::basic_ostream<_CharT, _Traits>::__ios_type&)) [with _CharT = char; _Traits = std::char_traits; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream; std::basic_ostream<_CharT, _Traits>::__ios_type = std::basic_ios]’ 117 | operator<<(__ios_type& (*__pf)(__ios_type&)) | ^~~~~~~~ /usr/include/c++/9/ostream:117:32: note: no known conversion for argument 1 from ‘void’ to ‘std::basic_ostream::__ios_type& (*)(std::basic_ostream::__ios_type&)’ {aka ‘std::basic_ios& (*)(std::basic_ios&)’} 117 | operator<<(__ios_type& (*__pf)(__ios_type&)) | ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~ /usr/include/c++/9/ostream:127:7: note: candidate: ‘std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(std::ios_base& (*)(std::ios_base&)) [with _CharT = char; _Traits = std::char_traits; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream]’ 127 | operator<<(ios_base& (*__pf) (ios_base&)) | ^~~~~~~~ /usr/include/c++/9/ostream:127:30: note: no known conversion for argument 1 from ‘void’ to ‘std::ios_base& (*)(std::ios_base&)’ 127 | operator<<(ios_base& (*__pf) (ios_base&)) | ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~ /usr/include/c++/9/ostream:166:7: note: candidate: ‘std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long int) [with _CharT = char; _Traits = std::char_traits; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream]’ 166 | operator<<(long __n) | ^~~~~~~~ /usr/include/c++/9/ostream:166:23: note: no known conversion for argument 1 from ‘void’ to ‘long int’ 166 | operator<<(long __n) | ~~~~~^~~ /usr/include/c++/9/ostream:170:7: note: candidate: ‘std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long unsigned int) [with _CharT = char; _Traits = std::char_traits; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream]’ 170 | operator<<(unsigned long __n) | ^~~~~~~~ /usr/include/c++/9/ostream:170:32: note: no known conversion for argument 1 from ‘void’ to ‘long unsigned int’ 170 | operator<<(unsigned long __n) | ~~~~~~~~~~~~~~^~~ /usr/include/c++/9/ostream:174:7: note: candidate: ‘std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(bool) [with _CharT = char; _Traits = std::char_traits; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream]’ 174 | operator<<(bool __n) | ^~~~~~~~ /usr/include/c++/9/ostream:174:23: note: no known conversion for argument 1 from ‘void’ to ‘bool’ 174 | operator<<(bool __n) | ~~~~~^~~ In file included from /usr/include/c++/9/ostream:702, from /usr/include/c++/9/istream:39, from /usr/include/c++/9/sstream:38, from /usr/include/c++/9/complex:45, from /usr/include/c++/9/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54, from Main.cc:1: /usr/include/c++/9/bits/ostream.tcc:91:5: note: candidate: ‘std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(short int) [with _CharT = char; _Traits = std::char_traits]’ 91 | basic_ostream<_CharT, _Traits>:: | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /usr/include/c++/9/bits/ostream.tcc:92:22: note: no known conversion for argument 1 from ‘void’ to ‘short int’ 92 | operator<<(short __n) | ~~~~~~^~~ In file included from /usr/include/c++/9/istream:39, from /usr/include/c++/9/sstream:38, from /usr/include/c++/9/complex:45, from /usr/include/c++/9/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54, from Main.cc:1: /usr/include/c++/9/ostream:181:7: note: candidate: ‘std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(short unsigned int) [with _CharT = char; _Traits = std::char_traits; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream]’ 181 | operator<<(unsigned short __n) | ^~~~~~~~ /usr/include/c++/9/ostream:181:33: note: no known conversion for argument 1 from ‘void’ to ‘short unsigned int’ 181 | operator<<(unsigned short __n) | ~~~~~~~~~~~~~~~^~~ In file included from /usr/include/c++/9/ostream:702, from /usr/include/c++/9/istream:39, from /usr/include/c++/9/sstream:38, from /usr/include/c++/9/complex:45, from /usr/include/c++/9/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54, from Main.cc:1: /usr/include/c++/9/bits/ostream.tcc:105:5: note: candidate: ‘std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(int) [with _CharT = char; _Traits = std::char_traits]’ 105 | basic_ostream<_CharT, _Traits>:: | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /usr/include/c++/9/bits/ostream.tcc:106:20: note: no known conversion for argument 1 from ‘void’ to ‘int’ 106 | operator<<(int __n) | ~~~~^~~ In file included from /usr/include/c++/9/istream:39, from /usr/include/c++/9/sstream:38, from /usr/include/c++/9/complex:45, from /usr/include/c++/9/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54, from Main.cc:1: /usr/include/c++/9/ostream:192:7: note: candidate: ‘std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(unsigned int) [with _CharT = char; _Traits = std::char_traits; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream]’ 192 | operator<<(unsigned int __n) | ^~~~~~~~ /usr/include/c++/9/ostream:192:31: note: no known conversion for argument 1 from ‘void’ to ‘unsigned int’ 192 | operator<<(unsigned int __n) | ~~~~~~~~~~~~~^~~ /usr/include/c++/9/ostream:201:7: note: candidate: ‘std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long long int) [with _CharT = char; _Traits = std::char_traits; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream]’ 201 | operator<<(long long __n) | ^~~~~~~~ /usr/include/c++/9/ostream:201:28: note: no known conversion for argument 1 from ‘void’ to ‘long long int’ 201 | operator<<(long long __n) | ~~~~~~~~~~^~~ /usr/include/c++/9/ostream:205:7: note: candidate: ‘std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long long unsigned int) [with _CharT = char; _Traits = std::char_traits; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream]’ 205 | operator<<(unsigned long long __n) | ^~~~~~~~ /usr/include/c++/9/ostream:205:37: note: no known conversion for argument 1 from ‘void’ to ‘long long unsigned int’ 205 | operator<<(unsigned long long __n) | ~~~~~~~~~~~~~~~~~~~^~~ /usr/include/c++/9/ostream:220:7: note: candidate: ‘std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(double) [with _CharT = char; _Traits = std::char_traits; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream]’ 220 | operator<<(double __f) | ^~~~~~~~ /usr/include/c++/9/ostream:220:25: note: no known conversion for argument 1 from ‘void’ to ‘double’ 220 | operator<<(double __f) | ~~~~~~~^~~ /usr/include/c++/9/ostream:224:7: note: candidate: ‘std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(float) [with _CharT = char; _Traits = std::char_traits; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream]’ 224 | operator<<(float __f) | ^~~~~~~~ /usr/include/c++/9/ostream:224:24: note: no known conversion for argument 1 from ‘void’ to ‘float’ 224 | operator<<(float __f) | ~~~~~~^~~ /usr/include/c++/9/ostream:232:7: note: candidate: ‘std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long double) [with _CharT = char; _Traits = std::char_traits; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream]’ 232 | operator<<(long double __f) | ^~~~~~~~ /usr/include/c++/9/ostream:232:30: note: no known conversion for argument 1 from ‘void’ to ‘long double’ 232 | operator<<(long double __f) | ~~~~~~~~~~~~^~~ /usr/include/c++/9/ostream:245:7: note: candidate: ‘std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(const void*) [with _CharT = char; _Traits = std::char_traits; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream]’ 245 | operator<<(const void* __p) | ^~~~~~~~ /usr/include/c++/9/ostream:245:30: note: no known conversion for argument 1 from ‘void’ to ‘const void*’ 245 | operator<<(const void* __p) | ~~~~~~~~~~~~^~~ In file included from /usr/include/c++/9/ostream:702, from /usr/include/c++/9/istream:39, from /usr/include/c++/9/sstream:38, from /usr/include/c++/9/complex:45, from /usr/include/c++/9/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54, from Main.cc:1: /usr/include/c++/9/bits/ostream.tcc:119:5: note: candidate: ‘std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_ostream<_CharT, _Traits>::__streambuf_type*) [with _CharT = char; _Traits = std::char_traits; std::basic_ostream<_CharT, _Traits>::__streambuf_type = std::basic_streambuf]’ 119 | basic_ostream<_CharT, _Traits>:: | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /usr/include/c++/9/bits/ostream.tcc:120:34: note: no known conversion for argument 1 from ‘void’ to ‘std::basic_ostream::__streambuf_type*’ {aka ‘std::basic_streambuf*’} 120 | operator<<(__streambuf_type* __sbin) | ~~~~~~~~~~~~~~~~~~^~~~~~ In file included from /usr/include/c++/9/regex:62, from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:110, from Main.cc:1: /usr/include/c++/9/bits/regex.h:1553:5: note: candidate: ‘template std::basic_ostream<_CharT, _Traits>& std::__cxx11::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::__cxx11::sub_match<_Bi_iter>&)’ 1553 | operator<<(basic_ostream<_Ch_type, _Ch_traits>& __os, | ^~~~~~~~ /usr/include/c++/9/bits/regex.h:1553:5: note: template argument deduction/substitution failed: Main.cc:9:16: note: mismatched types ‘const std::__cxx11::sub_match<_Bi_iter>’ and ‘void’ 9 | cout<

std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)’ 6419 | operator<<(basic_ostream<_CharT, _Traits>& __os, | ^~~~~~~~ /usr/include/c++/9/bits/basic_string.h:6419:5: note: template argument deduction/substitution failed: Main.cc:9:16: note: mismatched types ‘const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’ and ‘void’ 9 | cout<

std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::error_code&)’ 217 | operator<<(basic_ostream<_CharT, _Traits>& __os, const error_code& __e) | ^~~~~~~~ /usr/include/c++/9/system_error:217:5: note: template argument deduction/substitution failed: Main.cc:9:12: note: cannot convert ‘p(((int)n), ((int)m))’ (type ‘void’) to type ‘const std::error_code&’ 9 | cout<

std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, _CharT)’ 506 | operator<<(basic_ostream<_CharT, _Traits>& __out, _CharT __c) | ^~~~~~~~ /usr/include/c++/9/ostream:506:5: note: template argument deduction/substitution failed: Main.cc:9:16: note: deduced conflicting types for parameter ‘_CharT’ (‘char’ and ‘void’) 9 | cout<

std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, char)’ 511 | operator<<(basic_ostream<_CharT, _Traits>& __out, char __c) | ^~~~~~~~ /usr/include/c++/9/ostream:511:5: note: template argument deduction/substitution failed: Main.cc:9:12: note: cannot convert ‘p(((int)n), ((int)m))’ (type ‘void’) to type ‘char’ 9 | cout<

std::basic_ostream& std::operator<<(std::basic_ostream&, char)’ 517 | operator<<(basic_ostream& __out, char __c) | ^~~~~~~~ /usr/include/c++/9/ostream:517:5: note: template argument deduction/substitution failed: Main.cc:9:12: note: cannot convert ‘p(((int)n), ((int)m))’ (type ‘void’) to type ‘char’ 9 | cout<

std::basic_ostream& std::operator<<(std::basic_ostream&, signed char)’ 523 | operator<<(basic_ostream& __out, signed char __c) | ^~~~~~~~ /usr/include/c++/9/ostream:523:5: note: template argument deduction/substitution failed: Main.cc:9:12: note: cannot convert ‘p(((int)n), ((int)m))’ (type ‘void’) to type ‘signed char’ 9 | cout<

std::basic_ostream& std::operator<<(std::basic_ostream&, unsigned char)’ 528 | operator<<(basic_ostream& __out, unsigned char __c) | ^~~~~~~~ /usr/include/c++/9/ostream:528:5: note: template argument deduction/substitution failed: Main.cc:9:12: note: cannot convert ‘p(((int)n), ((int)m))’ (type ‘void’) to type ‘unsigned char’ 9 | cout<

std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const _CharT*)’ 548 | operator<<(basic_ostream<_CharT, _Traits>& __out, const _CharT* __s) | ^~~~~~~~ /usr/include/c++/9/ostream:548:5: note: template argument deduction/substitution failed: Main.cc:9:16: note: mismatched types ‘const _CharT*’ and ‘void’ 9 | cout<

std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const char*)’ 321 | operator<<(basic_ostream<_CharT, _Traits>& __out, const char* __s) | ^~~~~~~~ /usr/include/c++/9/bits/ostream.tcc:321:5: note: template argument deduction/substitution failed: Main.cc:9:12: note: cannot convert ‘p(((int)n), ((int)m))’ (type ‘void’) to type ‘const char*’ 9 | cout<

std::basic_ostream& std::operator<<(std::basic_ostream&, const char*)’ 565 | operator<<(basic_ostream& __out, const char* __s) | ^~~~~~~~ /usr/include/c++/9/ostream:565:5: note: template argument deduction/substitution failed: Main.cc:9:12: note: cannot convert ‘p(((int)n), ((int)m))’ (type ‘void’) to type ‘const char*’ 9 | cout<

std::basic_ostream& std::operator<<(std::basic_ostream&, const signed char*)’ 578 | operator<<(basic_ostream& __out, const signed char* __s) | ^~~~~~~~ /usr/include/c++/9/ostream:578:5: note: template argument deduction/substitution failed: Main.cc:9:12: note: cannot convert ‘p(((int)n), ((int)m))’ (type ‘void’) to type ‘const signed char*’ 9 | cout<

std::basic_ostream& std::operator<<(std::basic_ostream&, const unsigned char*)’ 583 | operator<<(basic_ostream& __out, const unsigned char* __s) | ^~~~~~~~ /usr/include/c++/9/ostream:583:5: note: template argument deduction/substitution failed: Main.cc:9:12: note: cannot convert ‘p(((int)n), ((int)m))’ (type ‘void’) to type ‘const unsigned char*’ 9 | cout<

typename std::enable_if >, std::__is_convertible_to_basic_ostream<_Ostream>, std::__is_insertable::__ostream_type, const _Tp&, void> >::value, typename std::__is_convertible_to_basic_ostream<_Tp>::__ostream_type>::type std::operator<<(_Ostream&&, const _Tp&)’ 691 | operator<<(_Ostream&& __os, const _Tp& __x) | ^~~~~~~~ /usr/include/c++/9/ostream:691:5: note: template argument deduction/substitution failed: /usr/include/c++/9/ostream: In substitution of ‘template typename std::enable_if >, std::__is_convertible_to_basic_ostream<_Ostream>, std::__is_insertable::__ostream_type, const _Tp&, void> >::value, typename std::__is_convertible_to_basic_ostream<_Tp>::__ostream_type>::type std::operator<<(_Ostream&&, const _Tp&) [with _Ostream = std::basic_ostream&; _Tp = void]’: Main.cc:9:16: required from here /usr/include/c++/9/ostream:691:5: error: forming reference to void In file included from /usr/include/c++/9/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54, from Main.cc:1: /usr/include/c++/9/complex:552:5: note: candidate: ‘template std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::complex<_Tp>&)’ 552 | operator<<(basic_ostream<_CharT, _Traits>& __os, const complex<_Tp>& __x) | ^~~~~~~~ /usr/include/c++/9/complex:552:5: note: template argument deduction/substitution failed: Main.cc:9:16: note: mismatched types ‘const std::complex<_Tp>’ and ‘void’ 9 | cout<

std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::bitset<_Nb>&)’ 1538 | operator<<(std::basic_ostream<_CharT, _Traits>& __os, | ^~~~~~~~ /usr/include/c++/9/bitset:1538:5: note: template argument deduction/substitution failed: Main.cc:9:16: note: mismatched types ‘const std::bitset<_Nb>’ and ‘void’ 9 | cout<

std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, std::_Resetiosflags)’ 79 | operator<<(basic_ostream<_CharT, _Traits>& __os, _Resetiosflags __f) | ^~~~~~~~ /usr/include/c++/9/iomanip:79:5: note: template argument deduction/substitution failed: Main.cc:9:12: note: cannot convert ‘p(((int)n), ((int)m))’ (type ‘void’) to type ‘std::_Resetiosflags’ 9 | cout<

std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, std::_Setiosflags)’ 109 | operator<<(basic_ostream<_CharT, _Traits>& __os, _Setiosflags __f) | ^~~~~~~~ /usr/include/c++/9/iomanip:109:5: note: template argument deduction/substitution failed: Main.cc:9:12: note: cannot convert ‘p(((int)n), ((int)m))’ (type ‘void’) to type ‘std::_Setiosflags’ 9 | cout<

std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, std::_Setbase)’ 143 | operator<<(basic_ostream<_CharT, _Traits>& __os, _Setbase __f) | ^~~~~~~~ /usr/include/c++/9/iomanip:143:5: note: template argument deduction/substitution failed: Main.cc:9:12: note: cannot convert ‘p(((int)n), ((int)m))’ (type ‘void’) to type ‘std::_Setbase’ 9 | cout<

std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, std::_Setfill<_CharT>)’ 178 | operator<<(basic_ostream<_CharT, _Traits>& __os, _Setfill<_CharT> __f) | ^~~~~~~~ /usr/include/c++/9/iomanip:178:5: note: template argument deduction/substitution failed: Main.cc:9:16: note: mismatched types ‘std::_Setfill<_CharT>’ and ‘void’ 9 | cout<