Submission #1066599

#	Time	Username	Problem	Language	Result	Execution time	Memory
1066599		guanex	Combo (IOI18_combo)	C++14	100 / 100	26 ms	1616 KiB

combo

#include "combo.h"
#include<bits/stdc++.h>

using namespace std;

typedef pair<int, int> ii;
typedef long long ll;
typedef vector<ll> vll;
typedef pair<long long, long long> pll;
typedef pair<char, int> ci;
typedef pair<string, int> si;
typedef long double ld;
typedef vector<int> vi;
typedef vector<string> vs;
#define pb push_back
#define fi first
#define se second
#define whole(v) v.begin(), v.end()
#define rwhole(v) v.rbegin(), v.rend()
#define inf INT_MAX/2
#define fro front


std::string guess_sequence(int N) {
    string s;
    char fi;
    if(press("AB")){
        if(press("A")){
            fi = 'A';
        }else{
            fi = 'B';
        }
    }else{
        if(press("X")){
            fi = 'X';
        }else{
            fi = 'Y';
        }
    }
    char x = 'Y';
    if(fi == 'Y'){
        x = 'X';
    }
    char y = 'B';
    if(fi == 'B'){
        y = 'X';
    }
    char z = 'A';
    if(fi == 'A'){
        z = 'X';
    }
    s.pb(fi);
    int lc = 1;
    for(int i = 1; i < N; ++i){
        if(lc > i){
            continue;
        }
        int c;
        if(i == N-1){
            c = press(s + x);
            if(c > lc){
                s.pb(x);
            }else{
                c = press(s + y);
                if(c > lc){
                    s.pb(y);
                }else{
                    s.pb(z);
                }
            }
            break;
        }
        string a[4];
        a[0] = s + x;
        a[1] = s + y + x;
        a[2] = s + y + y;
        a[3] = s + y + z;
        c = press(a[0] + a[1] + a[2] + a[3]);
        if(c == lc){
            s.pb(z);
            lc++;
        }else if(lc + 1 == c){
            s.pb(x);
            lc++;
        }else{
            s.pb(y);
            lc++;
        }
    }
    //cout << s << endl;
    return s;
}

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