Submission #220000

#	Time	Username	Problem	Language	Result	Execution time	Memory
220000		Basilhijaz	Combo (IOI18_combo)	C++14	Compilation error	0 ms	0 KiB

combo

#include <combo.h>

string guess_sequence(int N) {
    string p = "";
    string ans = "";
    string opt = "ABXY";
    int pos = -1;
    for(int i = 0; i < 3; i++){
        p = "";
        p += opt[i];
        if(press(p) == 1){
            ans += p;
            pos = i;
            break;
        }
    }
    if(pos == -1){
        pos = 3;
        ans += opt[3];
    }
    string ABX = "";
    for(int i = 0; i < 4; i++){
        if(i == pos)continue;
        ABX += opt[i];
    }
    for(int i = 0; i < N - 2; i++){
        p = "";
        p += ans;
        p += ABX[0];
        p += ans;
        p += ABX[1];
        p += ABX[1];
        p += ans;
        p += ABX[1];
        p += ABX[0];
        p += ans;
        p += ABX[1];
        p += ABX[2];
        int num = press(p);
        if(num == i + 1){
            ans += ABX[2];
        }
        else if(num == i + 2){
            ans += ABX[0];
        }
        else{
            ans += ABX[1];
        }
    }
    bool ok = 1;
    if(ans.size() == N) ok = 0;
    for(int i = 0; i < 2; i++){
        p = "";
        p += ans;
        p += ABX[i];
        if(press(p) == N && ok){
            ans += ABX[i];
            ok = 0;
            break;
        }
    }
    if(ok){
        ans += ABX[2];
    }
    return ans;
}

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