Submission #95572

#	Time	Username	Problem	Language	Result	Execution time	Memory
95572		dwsc	Combo (IOI18_combo)	C++14	0 / 100	2 ms	256 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>
using namespace std;
string guess_sequence(int N) {
    if (N == 1){
        if (press("AAAA")) return "A";
        if (press("BBBB")) return "B";
        if (press("XXXX")) return "X";
        return "Y";
    }
    string p = "";
    string ans = "";
    for (int i = 0; i < N; i++) p += 'A';
    for (int i = 0; i < N; i++) p += 'B';
    for (int i = 0; i < 2*N; i++) p += 'X';
    int val = press(p);
    if (val == 0){
        ans += 'Y';
    }
    else{
        p = "";
        p += 'A';
        p += 'B';
        for (int i = 0; i< N-2; i++) p += 'A';
        p += 'A';
        p += 'X';
        for (int i = 0; i< N-2; i++) p += 'A';
        p += 'A';
        p += 'Y';
        for (int i = 0; i< N-2; i++) p += 'A';
        for (int i = 0; i < N; i++) p += 'B';
        int val2 = press(p);
        if (val2 > 1) ans += 'A';
        else if (val2 == 1) ans += 'B';
        else ans += 'C';
    }
    vector<char> c;
    char start = ans[0];
    if (ans != "A")c.push_back('A');
    if (ans != "B")c.push_back('B');
    if (ans != "X")c.push_back('X');
    if (ans != "Y")c.push_back('Y');
    for (int i = 1; i < N-1; i++){
        p = "";
        for (int j = 0; j < 4; j++){
            for (int k = 0; k < i; k++) p += ans[k];
            if (j == 3){
                p += c[1];
                p += start;
            }
            else{
                p += c[0];
                p += c[j];
            }
            for (int k = i+2; k < N; k++) p += start;
        }
        int temp = press(p);
        //cout << p << " " << temp << "\n";
        if (temp == i) ans += c[2];
        else if (temp == i+1) ans += c[1];
        else ans += c[0];
    }
    p = "";
    for (int i = 0; i < 4; i++){
        for (int j = 0; j < N-1; j++) p += ans[j];
        if (i < 2) p += c[i];
        else p += start;
    }
    int temp1 = press(p);
    if (temp1 == N){
        p = "";
        for (int i = 0; i < 4; i++){
            for (int j = 0; j < N-1; j++) p += ans[j];
            if (i < 1) p += c[i];
            else p += start;
        }
        int temp2 = press(p);
        if (temp2 == N) ans += c[0];
        else ans += c[1];
    }
    else{
        ans += c[2];
    }
    //cout << ans;
    return ans;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 95