이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include "routers.h"
#include <bits/stdc++.h>
using namespace std;
vector<int> query_cache;
int customQuery(int x) {
if (query_cache[x] >= 0) {
return query_cache[x];
}
int result = use_detector(x);
query_cache[x] = result;
return result;
}
std::vector<int> find_routers(int length, int n, int _q) {
vector<int> answers(n);
// go to closest (lower_eq) even number
int global_upper = length & (~1);
query_cache.assign(length + 1, -1);
// for numbers up to x, y is the upper limit
// until index, stricter upper
set<pair<int, int>> upper_cache;
for (int i = 1; i < n; i++)
{
// find router i
int minimum = answers[i - 1];
// even, exclusive
int lower = minimum;
// even, inclusive
int upper = global_upper;
auto it = upper_cache.lower_bound({upper, 0});
if (it != upper_cache.end()) {
upper = (*it).second;
}
while (lower + 2 < upper) {
int middle = (lower + upper) / 2;
if (middle % 2 == 1) {
middle --;
}
int test = minimum + (middle - minimum) / 2 + 1;
int result = customQuery(test);
if (result < i) {
// the number is > middle
lower = middle;
} else {
// the number is <= middle
upper = middle;
if (result > i) {
// I know additional information
upper_cache.insert({result, upper});
// maybe todo remove some from upper_cache as well?
}
}
}
answers[i] = lower + 2;
}
return answers;
}
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