Submission #95698

#	Time	Username	Problem	Language	Result	Execution time	Memory
95698		shenxy	Combo (IOI18_combo)	C++11	10 / 100	78 ms	528 KiB

combo

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

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:12:9: warning: 'K' may be used uninitialized in this function [-Wmaybe-uninitialized]
   12 |         if (K < i) {
      |         ^~

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