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#include <cstdio>
#include <cstdlib>
#include <algorithm>
#include <string>
#include <bits/stdc++.h>
using namespace std;
int press(std::string p);
char CHARS[4] = {'A', 'B', 'X', 'Y'};
std::string guess_sequence(int N) {
//Get first char
int first;
if (press("AB")) {
if (press("A")) {
first = 0;
} else {
first = 1;
}
} else if (press("X")) {
first = 2;
} else {
first = 3;
}
string res = " ";res[0] = CHARS[first];
vector<char> cs;
for (char c: CHARS) {
if (c != CHARS[first]) cs.push_back(c);
}
for (int i = 0; i < N - 1; i++) {
if (press(res + cs[0] + res + cs[1]) == res.size() + 1) {
if (press(res + cs[0]) == res.size() + 1) {
res += cs[0];
} else {
res += cs[1];
}
} else {
res += cs[2];
}
}
return res;
}
#ifdef LOCAL_TEST
#include <random>
namespace {
constexpr int MAX_N = 2000;
constexpr int MAX_NUM_MOVES = 8000;
int N;
std::string S;
int num_moves;
void wrong_answer(const char *MSG) {
printf("Wrong Answer: %s\n", MSG);
exit(0);
}
} // namespace
int press(std::string p) {
if (++num_moves > MAX_NUM_MOVES) {
wrong_answer("too many moves");
}
int len = p.length();
if (len > 4 * N) {
wrong_answer("invalid press");
}
for (int i = 0; i < len; ++i) {
if (p[i] != 'A' && p[i] != 'B' && p[i] != 'X' && p[i] != 'Y') {
wrong_answer("invalid press");
}
}
int coins = 0;
for (int i = 0, j = 0; i < len; ++i) {
if (j < N && S[j] == p[i]) {
++j;
} else if (S[0] == p[i]) {
j = 1;
} else {
j = 0;
}
coins = std::max(coins, j);
}
return coins;
}
int main() {
/*char buffer[MAX_N + 1];
if (scanf("%s", buffer) != 1) {
fprintf(stderr, "Error while reading input\n");
exit(1);
}
S = buffer;
N = S.length();*/
for (int i = 0; i< 1000; i++) {
N = rand() % 50 + 1;
S.resize(N);
for (int i = 0; i < N; i++) {
char c;
do {
c = CHARS[rand() % 4];
} while (i != 0 && S[0] == c);
S[i] = c;
}
cout << S << endl;
num_moves = 0;
std::string answer = guess_sequence(N);
if (answer != S) {
cout << "Guess:\n" << answer << endl;
wrong_answer("wrong guess");
exit(0);
}
printf("Accepted: %d\n", num_moves);
}
return 0;
}
#endif
컴파일 시 표준 에러 (stderr) 메시지
combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:36:42: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
36 | if (press(res + cs[0] + res + cs[1]) == res.size() + 1) {
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
combo.cpp:37:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
37 | if (press(res + cs[0]) == res.size() + 1) {
| ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
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