/// In The Name Of God
#include <bits/stdc++.h>
#ifndef IOI2018
#include "prize.h"
#endif
#define f first
#define s second
#define pb push_back
#define pp pop_back
#define mp make_pair
#define sz(x) (int)x.size()
#define sqr(x) ((x) * 1ll * (x))
#define all(x) x.begin(), x.end()
#define rep(i, l, r) for (int i = (l); i < (r); i++)
#define per(i, l, r) for (int i = (l); i >= (r); i--)
#define Kazakhstan ios_base :: sync_with_stdio(0), cin.tie(0), cout.tie(0);
#define nl '\n'
#define ioi exit(0);
typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
const int N = (int)5e5 + 7;
const int inf = (int)1e9 + 7;
const int mod = (int)1e9 + 7;
const ll linf = (ll)1e18 + 7;
const int dx[] = {-1, 0, 1, 0, 1, -1, -1, 1};
const int dy[] = {0, 1, 0, -1, 1, -1, 1, -1};
using namespace std;
namespace com {
static const int max_q = 5000;
static int n;
static int query_count = 0;
static vector<int> g;
static vector<vector<int> > rank_count;
}
namespace grader {
using namespace com;
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;
}
}
#ifdef IOI2018
using namespace grader;
#endif
const int K = 500;
map <int, vector <int > > dp;
vector <int> get(int p) {
if (dp.count(p)) return dp[p];
return dp[p] = ask(p);
}
int mx;
int tin;
/// 1 2 5 26
int solve(int p, int n) {
if (p >= n) assert(0);
{
while (1) {
vector <int> now = get(p);
if (now[0] + now[1] == 0) return p;
if (now[0] + now[1] == mx) break;
p++;
}
}
int l = p / K + 1, r = (n - 1) / K, res = p / K;
vector <int> cur = get(p);
while (l <= r) {
int mid = l + r >> 1;
vector <int> now = get(K * mid);
if (now[0] + now[1] == 0) return K * mid;
if (cur == now) res = mid, l = mid + 1;
else r = mid - 1;
}
//cerr << p << ' ' << res * K << nl;
l = max(p, res * K);
r = min(n - 1, (res + 1) * K - 1);
int nxt = -1;
while (l <= r) {
int mid = l + r >> 1;
vector <int> now = get(mid);
if (now[0] + now[1] == 0) return mid;
if (cur == now) nxt = mid, l = mid + 1;
else r = mid - 1;
}
++nxt;
return solve(nxt, n);
}
int find_best(int n) {
int id = -1;
set <int> st;
rep(i, 0, min(n, 473)) {
vector <int> cur = ask(i);
if (!max(cur[0], cur[1])) return i;
st.insert(cur[0] + cur[1]);
if (mx <= cur[0] + cur[1]) mx = cur[0] + cur[1], id = i;
if (mx >= 33) break;
}
return solve(id, n);
}
namespace read {
using namespace com;
void read() {
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);
cout << res;
ioi
cout << res << endl << "Query count: " << query_count << endl;
ioi
}
}
#ifdef IOI2018
int main() {
#ifdef IOI2018
freopen ("in.txt", "r", stdin);
freopen ("slow.out", "w", stdout);
#endif
read :: read();
}
#endif
Compilation message
prize.cpp: In function 'int solve(int, int)':
prize.cpp:98:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
int mid = l + r >> 1;
~~^~~
prize.cpp:109:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
int mid = l + r >> 1;
~~^~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
320 KB |
Output is correct |
| 2 |
Correct |
7 ms |
316 KB |
Output is correct |
| 3 |
Correct |
5 ms |
256 KB |
Output is correct |
| 4 |
Correct |
3 ms |
392 KB |
Output is correct |
| 5 |
Correct |
6 ms |
428 KB |
Output is correct |
| 6 |
Correct |
2 ms |
308 KB |
Output is correct |
| 7 |
Correct |
8 ms |
256 KB |
Output is correct |
| 8 |
Correct |
4 ms |
308 KB |
Output is correct |
| 9 |
Correct |
9 ms |
376 KB |
Output is correct |
| 10 |
Correct |
7 ms |
384 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
7 ms |
384 KB |
Output is correct |
| 2 |
Correct |
5 ms |
388 KB |
Output is correct |
| 3 |
Correct |
4 ms |
304 KB |
Output is correct |
| 4 |
Correct |
7 ms |
384 KB |
Output is correct |
| 5 |
Correct |
4 ms |
384 KB |
Output is correct |
| 6 |
Correct |
2 ms |
384 KB |
Output is correct |
| 7 |
Correct |
5 ms |
256 KB |
Output is correct |
| 8 |
Correct |
7 ms |
256 KB |
Output is correct |
| 9 |
Correct |
5 ms |
384 KB |
Output is correct |
| 10 |
Correct |
7 ms |
320 KB |
Output is correct |
| 11 |
Correct |
5 ms |
384 KB |
Output is correct |
| 12 |
Correct |
3 ms |
412 KB |
Output is correct |
| 13 |
Correct |
5 ms |
428 KB |
Output is correct |
| 14 |
Correct |
4 ms |
384 KB |
Output is correct |
| 15 |
Correct |
10 ms |
376 KB |
Output is correct |
| 16 |
Correct |
45 ms |
760 KB |
Output is correct |
| 17 |
Correct |
3 ms |
256 KB |
Output is correct |
| 18 |
Correct |
50 ms |
808 KB |
Output is correct |
| 19 |
Correct |
3 ms |
256 KB |
Output is correct |
| 20 |
Correct |
14 ms |
504 KB |
Output is correct |
| 21 |
Correct |
21 ms |
584 KB |
Output is correct |
| 22 |
Correct |
8 ms |
388 KB |
Output is correct |
| 23 |
Correct |
4 ms |
512 KB |
Output is correct |
| 24 |
Correct |
3 ms |
384 KB |
Output is correct |
| 25 |
Correct |
33 ms |
540 KB |
Output is correct |
| 26 |
Correct |
27 ms |
592 KB |
Output is correct |
| 27 |
Correct |
3 ms |
324 KB |
Output is correct |
| 28 |
Correct |
79 ms |
768 KB |
Output is correct |
| 29 |
Correct |
37 ms |
720 KB |
Output is correct |
| 30 |
Correct |
33 ms |
880 KB |
Output is correct |
| 31 |
Correct |
3 ms |
392 KB |
Output is correct |
| 32 |
Correct |
8 ms |
304 KB |
Output is correct |
| 33 |
Correct |
2 ms |
256 KB |
Output is correct |
| 34 |
Correct |
11 ms |
556 KB |
Output is correct |
| 35 |
Correct |
8 ms |
384 KB |
Output is correct |
| 36 |
Correct |
15 ms |
376 KB |
Output is correct |
| 37 |
Correct |
3 ms |
516 KB |
Output is correct |
| 38 |
Correct |
8 ms |
428 KB |
Output is correct |
| 39 |
Correct |
21 ms |
528 KB |
Output is correct |
| 40 |
Correct |
28 ms |
908 KB |
Output is correct |
| 41 |
Correct |
20 ms |
736 KB |
Output is correct |
| 42 |
Correct |
19 ms |
736 KB |
Output is correct |
| 43 |
Correct |
17 ms |
692 KB |
Output is correct |
| 44 |
Correct |
22 ms |
460 KB |
Output is correct |
| 45 |
Correct |
22 ms |
552 KB |
Output is correct |
| 46 |
Correct |
3 ms |
428 KB |
Output is correct |
| 47 |
Correct |
24 ms |
504 KB |
Output is correct |
| 48 |
Correct |
39 ms |
680 KB |
Output is correct |
| 49 |
Correct |
5 ms |
344 KB |
Output is correct |
| 50 |
Correct |
55 ms |
824 KB |
Output is correct |
| 51 |
Correct |
10 ms |
492 KB |
Output is correct |
| 52 |
Correct |
4 ms |
512 KB |
Output is correct |
| 53 |
Correct |
5 ms |
516 KB |
Output is correct |
| 54 |
Correct |
19 ms |
652 KB |
Output is correct |
| 55 |
Correct |
2 ms |
256 KB |
Output is correct |
| 56 |
Correct |
43 ms |
1000 KB |
Output is correct |
| 57 |
Correct |
34 ms |
760 KB |
Output is correct |
| 58 |
Correct |
30 ms |
632 KB |
Output is correct |
| 59 |
Correct |
16 ms |
864 KB |
Output is correct |
| 60 |
Correct |
13 ms |
624 KB |
Output is correct |
| 61 |
Correct |
5 ms |
404 KB |
Output is correct |
| 62 |
Correct |
6 ms |
304 KB |
Output is correct |
| 63 |
Correct |
6 ms |
408 KB |
Output is correct |
| 64 |
Correct |
7 ms |
384 KB |
Output is correct |
| 65 |
Correct |
3 ms |
256 KB |
Output is correct |
| 66 |
Correct |
6 ms |
256 KB |
Output is correct |
| 67 |
Correct |
3 ms |
256 KB |
Output is correct |
| 68 |
Correct |
5 ms |
256 KB |
Output is correct |
| 69 |
Correct |
6 ms |
256 KB |
Output is correct |
| 70 |
Correct |
3 ms |
432 KB |
Output is correct |
| 71 |
Correct |
44 ms |
824 KB |
Output is correct |
| 72 |
Correct |
7 ms |
300 KB |
Output is correct |
| 73 |
Correct |
39 ms |
888 KB |
Output is correct |
| 74 |
Correct |
33 ms |
888 KB |
Output is correct |
| 75 |
Correct |
9 ms |
384 KB |
Output is correct |
| 76 |
Correct |
40 ms |
720 KB |
Output is correct |
| 77 |
Correct |
26 ms |
900 KB |
Output is correct |
| 78 |
Correct |
7 ms |
312 KB |
Output is correct |
| 79 |
Correct |
18 ms |
640 KB |
Output is correct |
| 80 |
Correct |
51 ms |
896 KB |
Output is correct |
| 81 |
Correct |
52 ms |
900 KB |
Output is correct |
| 82 |
Correct |
55 ms |
832 KB |
Output is correct |
| 83 |
Correct |
4 ms |
392 KB |
Output is correct |
| 84 |
Correct |
39 ms |
708 KB |
Output is correct |
| 85 |
Correct |
45 ms |
888 KB |
Output is correct |
| 86 |
Correct |
3 ms |
392 KB |
Output is correct |
| 87 |
Correct |
2 ms |
256 KB |
Output is correct |
| 88 |
Correct |
6 ms |
256 KB |
Output is correct |
| 89 |
Correct |
5 ms |
256 KB |
Output is correct |
| 90 |
Correct |
5 ms |
384 KB |
Output is correct |
| 91 |
Correct |
5 ms |
256 KB |
Output is correct |
| 92 |
Correct |
9 ms |
256 KB |
Output is correct |
| 93 |
Correct |
11 ms |
256 KB |
Output is correct |
| 94 |
Correct |
10 ms |
256 KB |
Output is correct |
| 95 |
Correct |
10 ms |
300 KB |
Output is correct |
| 96 |
Correct |
11 ms |
512 KB |
Output is correct |
| 97 |
Correct |
8 ms |
256 KB |
Output is correct |
