Submission #1103995

#	Time	Username	Problem	Language	Result	Execution time	Memory
1103995		asdfghjk	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

#include <bits/stdc++.h>
#define ll long long
#define pb push_back
#define all(x) x.begin(), x.end()
#define F first
#define ld long double
#define S second
using namespace std;
const ll N = 5e3 + 5;
const ll NN = 4e5 + 5;
const ll INF = 1e18;
const ll inf = 1e9;
const ll MOD = 1e9 + 7;
char a[10];
int was[10];
string z[15];
int press(std::string p);
string find_first(){
    string d = "";
    d += a[1];
    if(press(d) == 1){
        a[1] = a[2];
        a[2] = a[3];
        a[3] = a[4];
        return d;
    }
    d.pop_back();
    d += a[2];
    if(press(d) == 1){
        a[2] = a[3];
        a[3] = a[4];
        return d;
    }
    d.pop_back();
    d += a[3];
    if(press(d) == 1){
        a[3] = a[4];
        return d;
    }
    d.pop_back();
    d += a[4];
    if(press(d) == 1){
        return d;
    }
}
string guess_sequence(int n){
    a[1] = 'A';
    a[2] = 'B';
    a[3] = 'X';
    a[4] = 'Y';
    string s = find_first();
    for(int i = 2;i <= n;i++){
        if(int(s.size()) > i)continue;
        string d = s;
        d += a[1];
        d += a[2];
        int res = press(d);
        if(res == val){
            s += a[3];
        }
        else if(res == val + 1){
            d = s + a[1];
            res = press(d);
            if(res == val + 1){
                s = d;
            }
            else{
                s += a[2];
            }
        }
        else{
            s = d;
        }
    }
    return s;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:58:19: error: 'val' was not declared in this scope
   58 |         if(res == val){
      |                   ^~~
combo.cpp: In function 'std::string find_first()':
combo.cpp:45:1: warning: control reaches end of non-void function [-Wreturn-type]
   45 | }
      | ^