Submission #964318

#	Time	Username	Problem	Language	Result	Execution time	Memory
964318		BestCrazyNoob	Combo (IOI18_combo)	C++17	5 / 100	1 ms	504 KiB

combo

#include "combo.h"

using namespace std;

string guess_sequence(int N) {
    char map[] = {'A', 'B', 'X', 'Y'};
    string ans = "";

    // Determine first letter
    int first_idx;
    if (press("AB")) {
        if (press("A")) first_idx = 0;
        else first_idx = 1;
    } else {
        if (press("X")) first_idx = 2;
        else first_idx = 3;
    }
    swap(map[0], map[first_idx]);
    ans += map[0];

    // Add letters form 1 to n-2
    for (int i = 1; i < N-1; i++) {
        int res =  press(ans + map[2] + ans + map[3] + map[1] + ans + map[3] + map[2] + ans + map[3] + map[3]);
        if (res == i) ans += map[1];
        else if (res == i+1) ans += map[2];
        else if (res == i+2) ans += map[3];
        else abort();
    }
    // add last letter
    if (press(ans + map[1]) == N) ans += map[1];
    else if (press(ans + map[2]) == N) ans += map[2];
    else ans += map[3];

    return ans;
}

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