Submission #438415

#	Time	Username	Problem	Language	Result	Execution time	Memory
438415		Bom164	Combo (IOI18_combo)	C++14	100 / 100	41 ms	568 KiB

combo

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

using namespace std;

#define ll              long long
#define pb              push_back
#define mp              make_pair
#define pii             pair<int,int>
#define vi              vector<int>
#define mii             map<int,int>
#define pqb             priority_queue<int>
#define pqs             priority_queue<int,vi,greater<int> >
#define mod             1000000007
#define inf             1e18
#define rep(x,s,e) for (auto x=s-(s>e);x!=e-(s>e);s<e?x++:x--)
#define w(x)            int x; cin>>x; while(x--)

string s="";
string sf;

string guess_sequence(int n){
    s = (press("AB")?(press("A")?"A":"B"):(press("X")?"X":"Y"));
    int ss = s.size();
    if(n==1){
        return s;
    }
    if(s=="A"){
        for(int i=1;i<n-1;i++){
            int c = press(s+"B"+s+"XB"+s+"XX"+s+"XY");
            if(c==ss) s+="Y";
            else if(c==ss+1) s+="B";
            else s+="X";
            ss=s.size();
        }
        sf = s+"B";
        int q=press(sf);
        if(q==n){
		return sf;
        }
        sf=s+"X";
        q=press(sf);
        if(q==n){
            return sf;
        }
        else{
            return s+"Y";
        }
    }else if(s=="B"){
        for(int i=1;i<n-1;i++){
            int c = press(s+"A"+s+"XA"+s+"XX"+s+"XY");
            if(c==ss) s+="Y";
            else if(c==ss+1) s+="A";
            else s+="X";
            ss=s.size();
        }
        sf = s+"A";
        int q=press(sf);
        if(q==n){
		return sf;
        }
        sf=s+"X";
        q=press(sf);
        if(q==n){
            return sf;
        }
        else{
            return s+"Y";
        }
    }else if(s=="X"){
        for(int i=1;i<n-1;i++){
            int c = press(s+"B"+s+"AB"+s+"AA"+s+"AY");
            if(c==ss) s+="Y";
            else if(c==ss+1) s+="B";
            else s+="A";
            ss=s.size();
        }
        sf = s+"A";
        int q=press(sf);
        if(q==n){
		return sf;
        }
        sf=s+"B";
        q=press(sf);
        if(q==n){
            return sf;
        }
        else{
            return s+"Y";
        }
    }else if(s=="Y"){
        for(int i=1;i<n-1;i++){
            int c = press(s+"B"+s+"XB"+s+"XX"+s+"XA");
            if(c==ss) s+="A";
            else if(c==ss+1) s+="B";
            else s+="X";
            ss=s.size();
        }
        sf = s+"A";
        int q=press(sf);
        if(q==n){
		return sf;
        }
        sf=s+"B";
        q=press(sf);
        if(q==n){
            return sf;
        }
        else{
            return s+"X";
        }
    }
    return s;
}

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