제출 #861381

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
861381		imarn	Combo (IOI18_combo)	C++14	컴파일 에러	0 ms	0 KiB

combo

#include<bits/stdc++.h>
int press(std::string p);
std::string guess_sequence(int N){
    std::string ans="";
    char s[4];
    if(press("A")==1)ans="A",s[0]='A',s[1]='B',s[2]='X',s[3]='Y';
    else if(press("B")==1)ans="B",s[0]='B',s[1]='A',s[2]='X',s[3]='Y';
    else if(press("X")==1)ans="X",s[0]='X',s[1]='B',s[2]='A',s[3]='Y';
    else ans="Y",s[0]='Y',s[1]='B',s[2]='X',s[3]='A';
    for(int i=2;i<=N-1;i++){
        std::string now1 = ans;now1+=s[1];
        std::string now2 = ans;now2+=s[2];now2+=s[1];
        std::string now3 = ans;now3+=s[2];now3+=s[2];
        std::string now4 = ans;now4+=s[2];now4+=s[3];
        std::string tt = now1+now2+now3+now4;
        int x = press(tt);
        if(x==i-1)ans = ans+s[3];
        else if(x==i)ans = ans+s[1];
        else ans = ans+s[2];
    }
    string tt1=ans;tt1+=s[1];
    string tt2=ans;tt2+=s[2];
  	if(press(tt1)==N){
        return tt1;
    }
    else if(press(tt2)==N){
        return tt2;
    }
    else{
        ans+=s[3];return ans;
    }
}

컴파일 시 표준 에러 (stderr) 메시지

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:21:5: error: 'string' was not declared in this scope; did you mean 'std::string'?
   21 |     string tt1=ans;tt1+=s[1];
      |     ^~~~~~
      |     std::string
In file included from /usr/include/c++/10/iosfwd:39,
                 from /usr/include/c++/10/ios:38,
                 from /usr/include/c++/10/istream:38,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/include/c++/10/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:54,
                 from combo.cpp:1:
/usr/include/c++/10/bits/stringfwd.h:79:33: note: 'std::string' declared here
   79 |   typedef basic_string<char>    string;
      |                                 ^~~~~~
combo.cpp:21:20: error: 'tt1' was not declared in this scope
   21 |     string tt1=ans;tt1+=s[1];
      |                    ^~~
combo.cpp:22:11: error: expected ';' before 'tt2'
   22 |     string tt2=ans;tt2+=s[2];
      |           ^~~~
      |           ;
combo.cpp:22:20: error: 'tt2' was not declared in this scope
   22 |     string tt2=ans;tt2+=s[2];
      |                    ^~~