이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include "combo.h"
#include <bits/stdc++.h>
using namespace std;
char chars[4] = {'X', 'Y', 'A', 'B'};
int findBestn(int N, int k) {
int high = N-1, low = 1, mid;
while (high != low) {
mid = (high + low+1)/2;
if ((mid+k)*pow(3, mid)/2 <= 4*N) low = mid;
else high = mid - 1;
}
return low;
}
vector<string> createStr(int n, char excl, string S = "") {
if (n == 0) return {S};
vector<string> res;
for (char ch : chars) if (ch != excl) {
vector<string> tmp = createStr(n-1, excl, S + ch);
res.insert(res.end(), tmp.begin(), tmp.end());
}
return res;
}
string guess(int N, string S) {
int n = min(findBestn(N, S.length()), (int)(N-S.length()));
int i = (pow(3, n)+1)/2;
vector<string> tmp = createStr(n, S[0]);
vector<string> set1;
vector<string> set2;
while (tmp.size() > 1) {
for (int i = 0; i < tmp.size(); i++) {
if (i%2==1) set1.push_back(tmp[i]);
else set2.push_back(tmp[i]);
}
string testStr = "";
for (auto el : set1) {
testStr += S + el;
}
int res = press(testStr);
if (res == n+S.length()) tmp = set1;
else tmp = set2;
set1.clear();
set2.clear();
}
return tmp[0];
}
std::string guess_sequence(int N) {
string S{};
if (press("AB") >= 1) S = (press("A") ? "A" : "B");
else S = (press("X") ? "X" : "Y");
while (S.length() < N) S += guess(N, S);
return S;
}
컴파일 시 표준 에러 (stderr) 메시지
combo.cpp: In function 'std::string guess(int, std::string)':
combo.cpp:36:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
36 | for (int i = 0; i < tmp.size(); i++) {
| ~~^~~~~~~~~~~~
combo.cpp:45:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
45 | if (res == n+S.length()) tmp = set1;
| ~~~~^~~~~~~~~~~~~~~
combo.cpp:30:9: warning: unused variable 'i' [-Wunused-variable]
30 | int i = (pow(3, n)+1)/2;
| ^
combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:57:23: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
57 | while (S.length() < N) S += guess(N, S);
| ~~~~~~~~~~~^~~
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