Submission #485494

#	Time	Username	Problem	Language	Result	Execution time	Memory
485494		Joo	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

/*#include <bits/stdc++.h>
using namespace std;

int press(string p){
    cout << p << "\n";
    int x; cin >> x; return x;
}*/

string guess_sequence(int N){
    string str;
    vector<char> a = {'A', 'B', 'X', 'Y'};

    if(press("AB") == 0){ ///either x or y
        if(press("X") == 1){
            str += 'X';
            a.erase(a.begin()+2);
        }else{
            str += 'Y';
            a.erase(a.begin()+3);
        }
    }else{ ///either a or b
        if(press("A") == 1){
            str += 'A';
            a.erase(a.begin());
        }else{
            str += 'B';
            a.erase(a.begin()+1);
        }
    }

    for(int i = 2; i < N; i++){
        string tmp = str + a[1] + str + a[2] + a[0] + str + a[2] + a[1] + str + a[2] + a[2];
        int res = press(tmp);

        if(res == str.size()){ ///got nothing new
            str += a[0];
        }else if(res == str.size()+1){
            str += a[1];
        }else{
            str += a[2];
        }
    }

    if(press(str+a[0]) == N){
        str += a[0];
    }else if(press(str+a[1]) == N){
        str += a[1];
    }else{
        str += a[2];
    }

    return str;
}

/*
int main(void){
    cout << guess_sequence(5) << "\n";
    return 0;
}
*/

Compilation message (stderr)

combo.cpp:9:1: error: 'string' does not name a type
    9 | string guess_sequence(int N){
      | ^~~~~~