Submission #1004353

#	Time	Username	Problem	Language	Result	Execution time	Memory
1004353		The_Samurai	Combo (IOI18_combo)	C++17	97 / 100	23 ms	1840 KiB

combo

#include "combo.h"
#include "bits/stdc++.h"
using namespace std;

string guess_sequence(int n) {
    string s = "ABXY", ans = "";
    if (press("AB") >= 1) {
        if (press("A")) ans = "A";
        else ans = "B";
        // ans = (press("A") ? "A" : "B");
    } else {
        if (press("X")) ans = "X";
        else ans = "Y";
        // ans = (press("X") ? "X" : "Y");
    }
    s.erase(find(s.begin(), s.end(), ans[0]));
    for (int i = 1; i < n - 1; i++) {
        string t = "";
        t += ans + s[0];
        t += ans + s[1] + s[0];
        t += ans + s[1] + s[1];
        t += ans + s[1] + s[2];
        int shit = press(t);
        if (shit == ans.size()) ans += s[2];
        else if (shit == ans.size() + 1) ans += s[0];
        else ans += s[1];
    }
    for (int i = 0; i < 2; i++) {
        ans += s[i];
        if (press(ans) == ans.size()) break;
        ans.pop_back();
    }
    if (ans.size() != n) ans += s[2];
    return ans;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:24:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |         if (shit == ans.size()) ans += s[2];
      |             ~~~~~^~~~~~~~~~~~~
combo.cpp:25:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |         else if (shit == ans.size() + 1) ans += s[0];
      |                  ~~~~~^~~~~~~~~~~~~~~~~
combo.cpp:30:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |         if (press(ans) == ans.size()) break;
      |             ~~~~~~~~~~~^~~~~~~~~~~~~
combo.cpp:33:20: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   33 |     if (ans.size() != n) ans += s[2];
      |         ~~~~~~~~~~~^~~~

• Subtask 1: 5 / 5
• Subtask 2: 92 / 95