# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
1067205 | duckindog | A Difficult(y) Choice (BOI21_books) | C++17 | 2 ms | 1112 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#include "books.h"
using namespace std;
void solve(int n, int k, long long a, int s) {
vector<long long> x(n + 1);
vector<int> ret;
{ // k - 1
int total = 0;
for (int i = 1; i < k; ++i) {
if (!x[i]) x[i] = skim(i);
total += x[i];
}
auto get = [&](int i) {
if (!x[i]) x[i] = skim(i);
return total + x[i];
};
int l = k, r = n;
while (l <= r) {
int mid = l + r >> 1;
auto value = get(mid);
if (a <= value && value <= 2 * a) {
for (int i = 1; i < k; ++i) ret.push_back(i);
ret.push_back(mid);
answer(ret);
return;
}
if (value < a) l = mid + 1;
else r = mid - 1;
}
}
{ //consecutive
auto get = [&](int l, int r) {
long long total = 0;
for (int i = l; i <= r; ++i) {
if (!x[i]) x[i] = skim(i);
total += x[i];
}
return total;
};
int l = k, r = n;
while (l <= r) {
int mid = l + r >> 1;
auto value = get(mid - k + 1, mid);
if (a <= value && value <= 2 * a) {
for (int i = mid - k + 1; i <= mid; ++i) ret.push_back(i);
answer(ret);
return;
}
if (value < a) l = mid + 1;
else r = mid - 1;
}
}
impossible();
}
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