Submission #1007152

#	Time	Username	Problem	Language	Result	Execution time	Memory
1007152		christinelynn	Combo (IOI18_combo)	C++17	100 / 100	22 ms	1708 KiB

combo

#include <bits/stdc++.h>
using namespace std;
#define pii pair<ll,ll>
#define REP(i,x,y) for(ll i=x;i<=y;i++)
#define freeopen   freopen("input.txt","r",stdin); freopen("output.txt","w",stdout);
#define mod 1000000000
#define pb push_back
#define mk make_pair
#define ll long long
#define foor(x,vec) for(auto x:vec ){cout<<x<<" ";}
#define fi first
#define se second
#define MAXN 500069
#define lld long double
#define cha ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define ffl fflush(stdout)
#define sst string

ll mvx[]={0,0,-1,1};
ll mvy[]={1,-1,0,0};
sst ts="ABXY";
int n;
int press(string p);
string guess_sequence(int N){
    n=N;
    sst s="AB";
    int a=press(s);
    sst t="";
    char c='A';
    if(a>=1){
        s="A";
        if(press(s)){
            t=t+"A";
            c='A';
        }
        else{
            t=t+"B";
            c='B';
        }
    }
    else{
        s="X";
        if(press(s)){
            t=t+"X";
            c='X';
        }
        else{
            t=t+"Y";
            c='Y';
        }
    }
    vector <char> vec;
    for(int i=0;i<4;i++){
        if(ts[i]!=c)
            vec.pb(ts[i]);
    }
    ll bf=1;
    for(int i=2;i<n;i++){
        sst p=t+vec[0]+   t+vec[1]+vec[0]+    t+vec[1]+vec[1]+   t+vec[1]+vec[2];
        int val=press(p);
        if(val==i-1){
            t=t+vec[2];
        }
        else if(val==i){
            t=t+vec[0];
        }
        else{
            t=t+vec[1];
        }
    }
    if(n==1 )return t;
    s=t+"A"+t+"B";
    a=press(s);
    if(a==n){
        s=t+"A";
        if(press(s)==n){
            t=t+"A";
        }
        else{
            t=t+"B";
        }
    }
    else{
        s=t+"X";
        if(press(s)==n){
            t=t+"X";
        }
        else{
            t=t+"Y";
        }
    }
    return t;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:57:8: warning: unused variable 'bf' [-Wunused-variable]
   57 |     ll bf=1;
      |        ^~

• Subtask 1: 5 / 5
• Subtask 2: 95 / 95