// #pragma GCC optimize("O3")
// #pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#ifdef _DEBUG
int find_best(int n);
std::vector<int> ask(int i);
#else
#include "prize.h"
#endif
vector<int> a;
vector<int> b;
int N;
int segSet(int l, int r, int i, int k, int x)
{
if (l > k || r <= k)
return b[i];
if (l + 1 == r)
return a[l] = b[i] = x;
int m = (l + r) / 2;
return b[i] = segSet(l, m, i * 2 + 1, k, x) + segSet(m, r, i * 2 + 2, k, x);
}
int segGet(int l, int r, int i, int ql, int qr)
{
if (ql <= l && qr >= r)
return b[i];
if (ql >= r || qr <= l)
return 0;
int m = (l + r) / 2;
return segGet(l, m, i * 2 + 1, ql, qr) + segGet(m, r, i * 2 + 2, ql, qr);
}
int asks = 0;
int getRecursive(int l, int r, int cnt_here, int cnt_l, int cnt_r)
{
if (l >= r)
return -1;
if (cnt_here <= 0)
return -1;
int m = (l + r) / 2;
int i = m;
vector<int> answer;
bool is_special = false;
int diff_l = 0;
int diff_r = 0;
do
{
if (i == r)
break;
is_special = false;
asks++;
assert(asks < 10000);
answer = ask(i);
if (answer[0] + answer[1] == 0)
return i;
answer[0] -= cnt_l;
answer[1] -= cnt_r;
if (answer[0] + answer[1] != cnt_here)
{
is_special = true;
i++;
}
else
{
answer[0] -= i - m;
diff_l += i - m;
diff_r += i - m;
}
} while (is_special);
int left = -1;
if (i == r)
left = getRecursive(l, m, cnt_here - (i - m), cnt_l, cnt_r + (i - m));
else
left = getRecursive(l, m, answer[0], cnt_l, cnt_r + answer[1] + diff_r);
if (left != -1)
return left;
return getRecursive(i + 1, r, answer[1], cnt_l + answer[0] + diff_l, cnt_r);
}
int find_best(int n)
{
vector<int> cnt_here;
for (int k = 0; k < 20; k++)
{
int i = rand() % n;
vector<int> answer = ask(i);
cnt_here.push_back(answer[0] + answer[1]);
}
sort(cnt_here.begin(), cnt_here.end());
int result = getRecursive(0, n, cnt_here.back(), 0, 0);;
assert(result != -1);
return result;
}
#ifdef _DEBUG
#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
static const int max_q = 10000;
static int n;
static int query_count = 0;
static vector<int> g;
static vector<vector<int>> rank_count;
vector<int> ask(int i)
{
query_count++;
if (query_count > max_q)
{
cerr << "Query limit exceeded" << endl;
exit(0);
}
if (i < 0 || i >= n)
{
cerr << "Bad index: " << i << endl;
exit(0);
}
vector<int> res(2);
res[0] = rank_count[g[i] - 1][i + 1];
res[1] = rank_count[g[i] - 1][n] - res[0];
return res;
}
int main()
{
cin >> n;
g.resize(n);
for (int i = 0; i < n; i++)
{
cin >> g[i];
if (g[i] < 1)
{
cerr << "Invalid rank " << g[i] << " at index " << i << endl;
exit(0);
}
}
int max_rank = *max_element(g.begin(), g.end());
rank_count.resize(max_rank + 1, vector<int>(n + 1, 0));
for (int r = 0; r <= max_rank; r++)
{
for (int i = 1; i <= n; i++)
{
rank_count[r][i] = rank_count[r][i - 1];
if (g[i - 1] == r)
rank_count[r][i]++;
}
}
for (int i = 0; i <= n; i++)
for (int r = 1; r <= max_rank; r++)
rank_count[r][i] += rank_count[r - 1][i];
int res = find_best(n);
assert(g[res] == 1);
cout << res << endl
<< "Query count: " << query_count << endl;
return 0;
}
#endif
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
344 KB |
Output is correct |
| 2 |
Correct |
0 ms |
344 KB |
Output is correct |
| 3 |
Correct |
0 ms |
344 KB |
Output is correct |
| 4 |
Correct |
1 ms |
344 KB |
Output is correct |
| 5 |
Correct |
0 ms |
344 KB |
Output is correct |
| 6 |
Correct |
1 ms |
344 KB |
Output is correct |
| 7 |
Correct |
0 ms |
344 KB |
Output is correct |
| 8 |
Correct |
1 ms |
344 KB |
Output is correct |
| 9 |
Correct |
1 ms |
344 KB |
Output is correct |
| 10 |
Correct |
0 ms |
344 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
344 KB |
Output is correct |
| 2 |
Correct |
1 ms |
344 KB |
Output is correct |
| 3 |
Correct |
1 ms |
344 KB |
Output is correct |
| 4 |
Correct |
1 ms |
344 KB |
Output is correct |
| 5 |
Correct |
1 ms |
344 KB |
Output is correct |
| 6 |
Correct |
1 ms |
344 KB |
Output is correct |
| 7 |
Correct |
1 ms |
344 KB |
Output is correct |
| 8 |
Correct |
0 ms |
344 KB |
Output is correct |
| 9 |
Correct |
1 ms |
344 KB |
Output is correct |
| 10 |
Correct |
1 ms |
344 KB |
Output is correct |
| 11 |
Correct |
1 ms |
344 KB |
Output is correct |
| 12 |
Correct |
1 ms |
344 KB |
Output is correct |
| 13 |
Correct |
3 ms |
596 KB |
Output is correct |
| 14 |
Correct |
1 ms |
344 KB |
Output is correct |
| 15 |
Correct |
2 ms |
344 KB |
Output is correct |
| 16 |
Correct |
13 ms |
344 KB |
Output is correct |
| 17 |
Correct |
1 ms |
344 KB |
Output is correct |
| 18 |
Correct |
13 ms |
344 KB |
Output is correct |
| 19 |
Correct |
0 ms |
344 KB |
Output is correct |
| 20 |
Correct |
5 ms |
424 KB |
Output is correct |
| 21 |
Correct |
10 ms |
344 KB |
Output is correct |
| 22 |
Correct |
2 ms |
344 KB |
Output is correct |
| 23 |
Correct |
0 ms |
344 KB |
Output is correct |
| 24 |
Correct |
1 ms |
344 KB |
Output is correct |
| 25 |
Correct |
10 ms |
344 KB |
Output is correct |
| 26 |
Correct |
14 ms |
344 KB |
Output is correct |
| 27 |
Correct |
1 ms |
344 KB |
Output is correct |
| 28 |
Correct |
13 ms |
344 KB |
Output is correct |
| 29 |
Correct |
19 ms |
344 KB |
Output is correct |
| 30 |
Correct |
16 ms |
344 KB |
Output is correct |
| 31 |
Correct |
1 ms |
344 KB |
Output is correct |
| 32 |
Correct |
2 ms |
344 KB |
Output is correct |
| 33 |
Correct |
0 ms |
344 KB |
Output is correct |
| 34 |
Correct |
6 ms |
428 KB |
Output is correct |
| 35 |
Correct |
1 ms |
344 KB |
Output is correct |
| 36 |
Correct |
4 ms |
344 KB |
Output is correct |
| 37 |
Correct |
1 ms |
344 KB |
Output is correct |
| 38 |
Correct |
0 ms |
344 KB |
Output is correct |
| 39 |
Correct |
8 ms |
424 KB |
Output is correct |
| 40 |
Correct |
17 ms |
344 KB |
Output is correct |
| 41 |
Correct |
12 ms |
356 KB |
Output is correct |
| 42 |
Correct |
11 ms |
344 KB |
Output is correct |
| 43 |
Correct |
9 ms |
344 KB |
Output is correct |
| 44 |
Correct |
6 ms |
344 KB |
Output is correct |
| 45 |
Correct |
4 ms |
344 KB |
Output is correct |
| 46 |
Correct |
1 ms |
344 KB |
Output is correct |
| 47 |
Correct |
7 ms |
344 KB |
Output is correct |
| 48 |
Correct |
15 ms |
344 KB |
Output is correct |
| 49 |
Correct |
1 ms |
344 KB |
Output is correct |
| 50 |
Correct |
15 ms |
344 KB |
Output is correct |
| 51 |
Correct |
8 ms |
344 KB |
Output is correct |
| 52 |
Correct |
1 ms |
344 KB |
Output is correct |
| 53 |
Correct |
1 ms |
344 KB |
Output is correct |
| 54 |
Correct |
11 ms |
344 KB |
Output is correct |
| 55 |
Correct |
1 ms |
344 KB |
Output is correct |
| 56 |
Correct |
14 ms |
344 KB |
Output is correct |
| 57 |
Correct |
18 ms |
344 KB |
Output is correct |
| 58 |
Correct |
15 ms |
344 KB |
Output is correct |
| 59 |
Correct |
13 ms |
344 KB |
Output is correct |
| 60 |
Correct |
10 ms |
344 KB |
Output is correct |
| 61 |
Correct |
1 ms |
344 KB |
Output is correct |
| 62 |
Correct |
1 ms |
344 KB |
Output is correct |
| 63 |
Correct |
2 ms |
344 KB |
Output is correct |
| 64 |
Correct |
1 ms |
344 KB |
Output is correct |
| 65 |
Correct |
1 ms |
344 KB |
Output is correct |
| 66 |
Correct |
2 ms |
344 KB |
Output is correct |
| 67 |
Correct |
3 ms |
344 KB |
Output is correct |
| 68 |
Correct |
1 ms |
344 KB |
Output is correct |
| 69 |
Correct |
2 ms |
344 KB |
Output is correct |
| 70 |
Correct |
2 ms |
340 KB |
Output is correct |
| 71 |
Correct |
15 ms |
344 KB |
Output is correct |
| 72 |
Correct |
2 ms |
348 KB |
Output is correct |
| 73 |
Correct |
22 ms |
344 KB |
Output is correct |
| 74 |
Correct |
14 ms |
344 KB |
Output is correct |
| 75 |
Correct |
1 ms |
344 KB |
Output is correct |
| 76 |
Correct |
32 ms |
344 KB |
Output is correct |
| 77 |
Correct |
35 ms |
344 KB |
Output is correct |
| 78 |
Correct |
2 ms |
344 KB |
Output is correct |
| 79 |
Correct |
11 ms |
344 KB |
Output is correct |
| 80 |
Correct |
28 ms |
344 KB |
Output is correct |
| 81 |
Correct |
23 ms |
344 KB |
Output is correct |
| 82 |
Correct |
19 ms |
344 KB |
Output is correct |
| 83 |
Correct |
1 ms |
344 KB |
Output is correct |
| 84 |
Correct |
24 ms |
344 KB |
Output is correct |
| 85 |
Correct |
35 ms |
344 KB |
Output is correct |
| 86 |
Incorrect |
52 ms |
424 KB |
Incorrect |
| 87 |
Halted |
0 ms |
0 KB |
- |
