Submission #1317013

#	Time	Username	Problem	Language	Result	Execution time	Memory
1317013		marzuq01	Combo (IOI18_combo)	C++20	Compilation error	0 ms	0 KiB

combo

#include "combo.h"

std::string guess_sequence(int N) {
    std::string ans;
    //std::string s;
    std::string alp = "ABXY";
    int coin;
    coin = press("AB");
    if(coin) {
        coin = press("A");
        if (coin) ans = "A";
        else ans = "B";
    } else {
        coin = press("X");
        if (coin) ans = "X";
        else ans = "Y";
    }
    std::string temp;
    for (auto i: alp) if (i != ans[0]) temp += i;
    //int tindex = 0; //012
    while(ans.size() < N) {
        int now = ans.size();
        string s = ans + temp[0] + temp[1] + ans+ temp[0] + temp[2] + ans + temp[0] + temp[0] + ans + temp[1];
        coin = press(s);
        if (coin == now) ans += temp[2];
        else if (coin == now + 1) ans += temp[1];
        else ans += temp[0];
    }
    return ans;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:23:9: error: 'string' was not declared in this scope
   23 |         string s = ans + temp[0] + temp[1] + ans+ temp[0] + temp[2] + ans + temp[0] + temp[0] + ans + temp[1];
      |         ^~~~~~
combo.cpp:23:9: note: suggested alternatives:
In file included from /usr/include/c++/13/string:41,
                 from combo.h:3,
                 from combo.cpp:1:
/usr/include/c++/13/bits/stringfwd.h:77:33: note:   'std::string'
   77 |   typedef basic_string<char>    string;
      |                                 ^~~~~~
/usr/include/c++/13/string:66:11: note:   'std::pmr::string'
   66 |     using string    = basic_string<char>;
      |           ^~~~~~
combo.cpp:24:22: error: 's' was not declared in this scope
   24 |         coin = press(s);
      |                      ^