Submission #1049269

#	Time	Username	Problem	Language	Result	Execution time	Memory
1049269		MrDogMeat	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

#include "combo.h"

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

    if(press("AB") >= 1) {
        if(press("A") == 1) {
            res += 'A';
            vec.erase(vec.begin());
        }
        else {
            res += 'B';
            vec.erase(vec.begin() + 1);
        }
    }
    else {
        if(press("X") == 1) {
            res += 'X';
            vec.erase(vec.begin() + 2);
        }
        else {
            res += 'Y';
            vec.erase(vec.begin() + 3);
        }
    }

    for(int i = 2; i < N; i++) {
        string Try = res + vec[0] + res + vec[1] + vec[0] + res + vec[1] + vec[1] + res + vec[1] + vec[2];
        int coins = press(Try);
        if(coins == i) res += vec[0];
        else if(coins == i + 1) res += vec[1];
        else res += vec[2];
    }

    if(press(res + vec[0]) == N) res += vec[0];
    else if(press(res + vec[1]) == N) res += vec[1];
    else res += vec[2];

    return res;
}

Compilation message (stderr)

combo.cpp:3:1: error: 'string' does not name a type; did you mean 'stdin'?
    3 | string guess_sequence(int N) {
      | ^~~~~~
      | stdin