Run ID 作者 问题 语言 测评结果 Time Memory 代码长度 提交时间
120786 韩潞琪 22砝码的重量 C++ Compile Error 0 MS 0 KB 296 2025-06-01 08:38:50

Tests(0/0):

Code:

#include<bits/stdc++.h> using namespace std; int main(){ int n,sum,min=0; cin<<n; int m[1001]={0}; for(i=1;i>=n;i++){ cin<<m[i]; sum-=m[i]; if(m[i]<min){ min=m[i]; } } cout>>min-sum>>endl; return 0; }

Run Info:

Main.cc: In function 'int main()':
Main.cc:5:7: error: no match for 'operator<<' (operand types are 'std::istream {aka std::basic_istream}' and 'int')
    cin<
Main.cc:5:7: note:   no known conversion for argument 1 from 'std::istream {aka std::basic_istream}' to 'int'
In file included from /usr/include/c++/5/regex:61:0,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:108,
                 from Main.cc:1:
/usr/include/c++/5/bits/regex.h:1480:5: note: candidate: template std::basic_ostream<_CharT, _Traits>& std::__cxx11::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::__cxx11::sub_match<_Bi_iter>&)
     operator<<(basic_ostream<_Ch_type, _Ch_traits>& __os,
     ^
/usr/include/c++/5/bits/regex.h:1480:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, std::thread::id)
     operator<<(basic_ostream<_CharT, _Traits>& __out, thread::id __id)
     ^
/usr/include/c++/5/thread:243:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::_Expr, typename std::__fun::result_type> std::operator<<(const _Tp&, const std::valarray<_Tp>&)
 _DEFINE_BINARY_OPERATOR(<<, __shift_left)
 ^
/usr/include/c++/5/valarray:1175:1: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   mismatched types 'const std::valarray<_Tp>' and 'int'
    cin< std::_Expr, typename std::__fun::result_type> std::operator<<(const std::valarray<_Tp>&, const _Tp&)
 _DEFINE_BINARY_OPERATOR(<<, __shift_left)
 ^
/usr/include/c++/5/valarray:1175:1: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::valarray<_Tp>'
    cin< std::_Expr, typename std::__fun::result_type> std::operator<<(const std::valarray<_Tp>&, const std::valarray<_Tp>&)
 _DEFINE_BINARY_OPERATOR(<<, __shift_left)
 ^
/usr/include/c++/5/valarray:1175:1: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::valarray<_Tp>'
    cin< std::_Expr, typename std::__fun::result_type> std::operator<<(const std::valarray&, const std::_Expr<_Dom1, typename _Dom1::value_type>&)
     _DEFINE_EXPR_BINARY_OPERATOR(<<, __shift_left)
     ^
/usr/include/c++/5/bits/valarray_after.h:410:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'int'
    cin< std::_Expr, typename std::__fun::result_type> std::operator<<(const std::_Expr<_Dom1, typename _Dom1::value_type>&, const std::valarray&)
     _DEFINE_EXPR_BINARY_OPERATOR(<<, __shift_left)
     ^
/usr/include/c++/5/bits/valarray_after.h:410:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
    cin< std::_Expr, typename std::__fun::result_type> std::operator<<(const typename _Dom::value_type&, const std::_Expr<_Dom1, typename _Dom1::value_type>&)
     _DEFINE_EXPR_BINARY_OPERATOR(<<, __shift_left)
     ^
/usr/include/c++/5/bits/valarray_after.h:410:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'int'
    cin< std::_Expr, typename std::__fun::result_type> std::operator<<(const std::_Expr<_Dom1, typename _Dom1::value_type>&, const typename _Dom::value_type&)
     _DEFINE_EXPR_BINARY_OPERATOR(<<, __shift_left)
     ^
/usr/include/c++/5/bits/valarray_after.h:410:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
    cin< std::_Expr, typename std::__fun::result_type> std::operator<<(const std::_Expr<_Dom1, typename _Dom1::value_type>&, const std::_Expr<_Dom2, typename _Dom2::value_type>&)
     _DEFINE_EXPR_BINARY_OPERATOR(<<, __shift_left)
     ^
/usr/include/c++/5/bits/valarray_after.h:410:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::__shared_ptr<_Tp, _Lp>&)
     operator<<(std::basic_ostream<_Ch, _Tr>& __os,
     ^
/usr/include/c++/5/bits/shared_ptr.h:66:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, std::_Put_time<_CharT>)
     operator<<(basic_ostream<_CharT, _Traits>& __os, _Put_time<_CharT> __f)
     ^
/usr/include/c++/5/iomanip:363:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, std::_Put_money<_MoneyT>)
     operator<<(basic_ostream<_CharT, _Traits>& __os, _Put_money<_MoneyT> __f)
     ^
/usr/include/c++/5/iomanip:311:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, std::_Setw)
     operator<<(basic_ostream<_CharT, _Traits>& __os, _Setw __f)
     ^
/usr/include/c++/5/iomanip:238:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, std::_Setprecision)
     operator<<(basic_ostream<_CharT, _Traits>& __os, _Setprecision __f)
     ^
/usr/include/c++/5/iomanip:208:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, std::_Setfill<_CharT>)
     operator<<(basic_ostream<_CharT, _Traits>& __os, _Setfill<_CharT> __f)
     ^
/usr/include/c++/5/iomanip:178:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, std::_Setbase)
     operator<<(basic_ostream<_CharT, _Traits>& __os, _Setbase __f)
     ^
/usr/include/c++/5/iomanip:143:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, std::_Setiosflags)
     operator<<(basic_ostream<_CharT, _Traits>& __os, _Setiosflags __f)
     ^
/usr/include/c++/5/iomanip:109:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, std::_Resetiosflags)
     operator<<(basic_ostream<_CharT, _Traits>& __os, _Resetiosflags __f)
     ^
/usr/include/c++/5/iomanip:79:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::bitset<_Nb>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^
/usr/include/c++/5/bitset:1530:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::piecewise_linear_distribution<_RealType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^
/usr/include/c++/5/bits/random.tcc:3160:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::piecewise_constant_distribution<_RealType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^
/usr/include/c++/5/bits/random.tcc:2944:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::discrete_distribution<_IntType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^
/usr/include/c++/5/bits/random.tcc:2734:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::student_t_distribution<_RealType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^
/usr/include/c++/5/bits/random.tcc:2275:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::fisher_f_distribution<_RealType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^
/usr/include/c++/5/bits/random.tcc:2200:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::chi_squared_distribution<_RealType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^
/usr/include/c++/5/bits/random.tcc:2036:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::lognormal_distribution<_RealType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^
/usr/include/c++/5/bits/random.tcc:1963:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::binomial_distribution<_IntType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^
/usr/include/c++/5/bits/random.tcc:1667:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::poisson_distribution<_IntType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^
/usr/include/c++/5/bits/random.tcc:1400:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::negative_binomial_distribution<_IntType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^
/usr/include/c++/5/bits/random.tcc:1195:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::shuffle_order_engine<_RandomNumberEngine, __k>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^
/usr/include/c++/5/bits/random.tcc:831:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::discard_block_engine<_RandomNumberEngine, __p, __r>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^
/usr/include/c++/5/bits/random.tcc:702:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::subtract_with_carry_engine<_UIntType, __w, __s, __r>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^
/usr/include/c++/5/bits/random.tcc:632:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::linear_congruential_engine<_UIntType, __a, __c, __m>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^
/usr/include/c++/5/bits/random.tcc:156:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::extreme_value_distribution<_RealType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^
/usr/include/c++/5/bits/random.tcc:2598:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::weibull_distribution<_RealType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^
/usr/include/c++/5/bits/random.tcc:2522:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::exponential_distribution<_RealType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^
/usr/include/c++/5/bits/random.tcc:1731:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::gamma_distribution<_RealType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^
/usr/include/c++/5/bits/random.tcc:2444:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::geometric_distribution<_IntType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^
/usr/include/c++/5/bits/random.tcc:1080:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::normal_distribution<_RealType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^
/usr/include/c++/5/bits/random.tcc:1898:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::bernoulli_distribution&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^
/usr/include/c++/5/bits/random.tcc:998:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::cauchy_distribution<_RealType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^
/usr/include/c++/5/bits/random.tcc:2123:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::uniform_real_distribution<_IntType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^
/usr/include/c++/5/bits/random.tcc:936:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::uniform_int_distribution<_IntType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^
/usr/include/c++/5/bits/random.tcc:877:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::mersenne_twister_engine<_UIntType, __w, __n, __m, __r, __a, __u, __d, __s, __b, __t, __c, __l, __f>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^
/usr/include/c++/5/bits/random.tcc:477:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::independent_bits_engine<_RandomNumberEngine, __w, _UIntType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^
/usr/include/c++/5/bits/random.h:1269:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::complex<_Tp>&)
     operator<<(basic_ostream<_CharT, _Traits>& __os, const complex<_Tp>& __x)
     ^
/usr/include/c++/5/complex:526:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&&, const _Tp&)
     operator<<(basic_ostream<_CharT, _Traits>&& __os, const _Tp& __x)
     ^
/usr/include/c++/5/ostream:628:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
    cin< std::basic_ostream& std::operator<<(std::basic_ostream&, const unsigned char*)
     operator<<(basic_ostream& __out, const unsigned char* __s)
     ^
/usr/include/c++/5/ostream:574:5: note:   template argument deduction/substitution failed:
Main.cc:5:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream'
    cin< std::basic_ostream& std::operator<<(std::basic_ostream&, const signed char*)