Run ID 作者 问题 语言 测评结果 Time Memory 代码长度 提交时间
136874 刘益梵 只出现一次的字符 C++ Compile Error 0 MS 0 KB 285 2025-11-15 16:05:36

Tests(0/0):

Code:

#include<bits/stdc++.h> using namespace std; int main(){ string a; int len=s.size(); cin<<a; for(int i=0;i<len;i++){ int cnt=0; for(int j=0;j<len;j++){ if(a[i] == a[j]) cnt++; } if(cnt==1){ cout<<s[i]; return 0; } } cout<<"no"; return 0; }

Run Info:

Main.cc: In function 'int main()':
Main.cc:5:10: error: 's' was not declared in this scope
  int len=s.size();
          ^
Main.cc:6:5: error: no match for 'operator<<' (operand types are 'std::istream {aka std::basic_istream}' and 'std::__cxx11::string {aka std::__cxx11::basic_string}')
  cin< 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:6:7: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
  cin<