Submission #95681

#	Time	Username	Problem	Language	Result	Execution time	Memory
95681		shenxy	Combo (IOI18_combo)	C++11	10 / 100	105 ms	424 KiB

combo

#include "combo.h"
#include <string>
#include <algorithm>
using namespace std;
string guess_sequence(int N) {
    string p = "";
    int K = -1;
    char firstchar = ' ';
    for (int i = 1; i <= N; ++i) {
        p += "A";
        if (i == 1 || firstchar != 'A') K = press(p);
        if (K < i) {
            p.pop_back();
            p += "B";
        } else {
            if (i == 1) firstchar = 'A';
            continue;
        }
        if (i == 1 || firstchar != 'B') K = press(p);
        if (K < i) {
            p.pop_back();
            p += "X";
        } else {
            if (i == 1) firstchar = 'B';
            continue;
        }
        if (i == 1 || firstchar != 'X') K = press(p);
        if (K < i) {
            p.pop_back();
            p += "Y";
            firstchar = 'Y';
        } else if (i == 1) firstchar = 'X';
    }
    return p;
}

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