Submission #705459

#	Time	Username	Problem	Language	Result	Execution time	Memory
705459		YassineBenYounes	Combo (IOI18_combo)	C++17	100 / 100	36 ms	560 KiB

combo

/*
ID: Yassine BenYounes
TASK: time
LANG: C++
*/
#include<bits/stdc++.h>
 
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef double db;
/*#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define pbds tree<int, null_type, less<int>,rb_tree_tag, tree_order_statistics_node_update>
using namespace __gnu_pbds;*/
ll gcd(ll a , ll b) {return b ? gcd(b , a % b) : a ;} // greatest common divisor (PGCD)
ll lcm(ll a , ll b) {return (a * b) / gcd(a , b);} // least common multiple (PPCM)
ll modd(ll x, ll n){while(x < 0){x += n;}return (x % n);} // modulo for negative numbers
int dx[8] = {0, -1, 0, 1, 1, 1, -1, -1};
int dy[8] = {-1, 0, 1, 0, -1, 1, -1, 1};
#define endl "\n"
#define ss second
#define ff first
#define all(x) (x).begin() , (x).end()
#define pb push_back
#define vi vector<int>
#define vii vector<pair<int,int>>
#define vl vector<ll>
#define vll vector<pair<ll,ll>>
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pdd  pair<double,double>
#define vdd  vector<pdd>
#define speed ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
using namespace std;
 
void init(){
    #ifndef ONLINE_JUDGE
 
freopen("input.txt", "r", stdin);
 
freopen("output.txt", "w", stdout);
 
#endif // ONLINE_JUDGE
}
 
const int mx = 1e6+9;
const ll mod = 1e9+7;
const int inf = 1e9;

int press(string p);

string guess_sequence(int N){
    string s;
    if(press("AB")!=0){
        if(press("A") != 0)s = "A";
        else s = "B";
    }
    else{
        if(press("X") != 0)s = "X";
        else s = "Y";
    }
    vector<string> v;
    if(s != "A")v.pb("A");
    if(s != "B")v.pb("B");
    if(s != "X")v.pb("X");
    if(s != "Y")v.pb("Y");
    for(int i = 2; i <= N;i++){
        if(i == N){
            int a = press(s + v[0]);
            int b = press(s + v[1]);
            if(a == b){
                s += v[2];
            }
            else{
                if(a > b){
                    s += v[0];
                }
                else s += v[1];
            }
            continue;
        }
        string res = s+v[0]+s+v[1]+v[0]+s+v[1]+v[1]+s+v[1]+v[2];
        int c = press(res);
        if(c == i+1){
            s += v[1];
        }
        else if(c == i){
            s += v[0];
        }
        else{
            s += v[2];
        }
    }
    return s;
}
/*
int main(){
    //ofstream fout ("teamwork.out");
    //ifstream fin ("teamwork.in");
    init();
    speed;
    cout << guess_sequence(10) << endl;
}*/

/*
    NEVER GIVE UP!
    DOING SMTHNG IS BETTER THAN DOING NTHNG!!!
*/

Compilation message (stderr)

combo.cpp: In function 'void init()':
combo.cpp:40:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 | freopen("input.txt", "r", stdin);
      | ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
combo.cpp:42:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 | freopen("output.txt", "w", stdout);
      | ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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