#include "prize.h"
#include <bits/stdc++.h>
using namespace std;
#define pii pair<int, int>
#define mp make_pair
#define maxn 200010
int blk;
int qs[maxn][2];
int numqueries = 0;
pii query(int spot) {
if (qs[spot][0] != -1)
return pii(qs[spot][0], qs[spot][1]);
numqueries++;
assert(numqueries <= 10000); //induce run time error instead of WA
//seems that above got hit
vector<int> res = ask(spot);
qs[spot][0] = res[0];
qs[spot][1] = res[1];
return pii(res[0], res[1]);
}
vector<pair<pii, pii>> q;
int find_best(int n) {
//we don't really care what happens for smaller n,
// b/c it is not a function of n
for (int i = 0; i < n; i++) {
qs[i][0] = qs[i][1] = -1;
}
//i am a little worried about exact blk bound
blk = sqrt(n)+50; //changed from 5 to 50
blk = min(blk, n); //just making sure
int bigskip = n+1;
int smallskip = -1;
int mxind = -1;
int mxstuff = -1;
for(int i = 0; i < blk; i++) {
pii res = query(i);
if(res.first + res.second == 0)
return i; //this will always be there
if (res.first == 0) {
//none smaller on left
smallskip = max(smallskip, i);
}
if (res.second == 0) {
bigskip = min(bigskip, i);
}
if (res.first+ res.second >= mxstuff) {
mxstuff = res.first + res.second;
mxind = i;
}
}
int aft = query(mxind).second;
int numtot = mxstuff; //total number less than biggest guy
int nc = 0;
for (int i = 0; i < blk; i++) {
pii cur = query(i);
if (cur.first + cur.second != numtot) nc++;
}
srand(23);
q.push_back(mp(mp(blk, n-1), mp(nc, 0)));
//gives number to left & right of range
while (q.size()) {
random_shuffle(q.begin(), q.end());
auto cur = q.back(); q.pop_back();
int cleft = cur.first.first;
int cright = cur.first.second;
if (cright <= smallskip) continue;
if (cleft >= bigskip) continue;
if (cleft > cright) continue; //why would we care
int numtoleft = cur.second.first;
int numtoright = cur.second.second;
if (numtoleft + numtoright == numtot) continue; //why bother
if (cleft == cright) {
pii cur = query(cleft);
if (cur.first + cur.second == 0) return cleft;
continue;
}
bool done = false;
int mid = (cleft + cright)/2;
int omid = mid;
int tookout = 0;
while (mid != cright+1) {
pii cur = query(mid);
if (cur.first == 0) {
smallskip = max(smallskip, mid);
}
if (cur.second == 0) {
bigskip = min(bigskip, mid);
}
if (cur.first + cur.second == numtot) {
q.push_back(mp(mp(cleft, omid-1),
mp(numtoleft, cur.second + tookout)));
q.push_back(mp(mp(mid+1, cright),
mp(cur.first, numtoright)));
done = true;
break;
}
else {
tookout++;
if (cur.first + cur.second == 0) return mid;
mid++;
}
}
if (done) continue;
mid = omid-1;
while (mid != cleft-1) {
pii cur = query(mid);
if (cur.first == 0) {
smallskip = max(smallskip, mid);
}
if (cur.second == 0) {
bigskip = min(bigskip, mid);
}
if (cur.first + cur.second == numtot) {
q.push_back(mp(mp(cleft , mid-1),
mp(numtoleft, cur.second)));
done = true;
break;
}
else {
if (cur.first + cur.second == 0) return mid;
mid--;
}
}
}
return 0;
}
//at most sqrt(n) guys that are not the maximums
//if we query smth not the maximum, we split it in half
//grader can behave adversarily
//need to cut out 256 of them
//idea could be to cut out from first section
// (just go forward until we know we got it)
Compilation message
prize.cpp: In function 'int find_best(int)':
prize.cpp:59:6: warning: unused variable 'aft' [-Wunused-variable]
int aft = query(mxind).second;
^~~
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
7 ms |
1784 KB |
Output is correct |
2 |
Correct |
8 ms |
1988 KB |
Output is correct |
3 |
Correct |
9 ms |
1988 KB |
Output is correct |
4 |
Correct |
7 ms |
1988 KB |
Output is correct |
5 |
Correct |
7 ms |
2016 KB |
Output is correct |
6 |
Correct |
3 ms |
2016 KB |
Output is correct |
7 |
Correct |
5 ms |
2032 KB |
Output is correct |
8 |
Correct |
5 ms |
2032 KB |
Output is correct |
9 |
Correct |
5 ms |
2064 KB |
Output is correct |
10 |
Correct |
7 ms |
2076 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
7 ms |
2076 KB |
Output is correct |
2 |
Correct |
5 ms |
2092 KB |
Output is correct |
3 |
Correct |
6 ms |
2108 KB |
Output is correct |
4 |
Correct |
7 ms |
2108 KB |
Output is correct |
5 |
Correct |
6 ms |
2108 KB |
Output is correct |
6 |
Correct |
3 ms |
2108 KB |
Output is correct |
7 |
Correct |
7 ms |
2108 KB |
Output is correct |
8 |
Correct |
8 ms |
2108 KB |
Output is correct |
9 |
Correct |
7 ms |
2108 KB |
Output is correct |
10 |
Correct |
6 ms |
2108 KB |
Output is correct |
11 |
Correct |
11 ms |
2108 KB |
Output is correct |
12 |
Correct |
8 ms |
2128 KB |
Output is correct |
13 |
Correct |
9 ms |
2128 KB |
Output is correct |
14 |
Correct |
11 ms |
2128 KB |
Output is correct |
15 |
Correct |
16 ms |
2128 KB |
Output is correct |
16 |
Correct |
59 ms |
2236 KB |
Output is correct |
17 |
Correct |
8 ms |
2236 KB |
Output is correct |
18 |
Correct |
72 ms |
2236 KB |
Output is correct |
19 |
Correct |
7 ms |
2236 KB |
Output is correct |
20 |
Correct |
18 ms |
2236 KB |
Output is correct |
21 |
Correct |
19 ms |
2236 KB |
Output is correct |
22 |
Correct |
46 ms |
2236 KB |
Output is correct |
23 |
Correct |
5 ms |
2236 KB |
Output is correct |
24 |
Correct |
9 ms |
2236 KB |
Output is correct |
25 |
Correct |
67 ms |
2236 KB |
Output is correct |
26 |
Correct |
94 ms |
2236 KB |
Output is correct |
27 |
Correct |
8 ms |
2236 KB |
Output is correct |
28 |
Correct |
36 ms |
2236 KB |
Output is correct |
29 |
Correct |
74 ms |
2236 KB |
Output is correct |
30 |
Correct |
59 ms |
2236 KB |
Output is correct |
31 |
Correct |
6 ms |
2236 KB |
Output is correct |
32 |
Correct |
9 ms |
2236 KB |
Output is correct |
33 |
Correct |
2 ms |
2236 KB |
Output is correct |
34 |
Correct |
29 ms |
2236 KB |
Output is correct |
35 |
Correct |
8 ms |
2236 KB |
Output is correct |
36 |
Correct |
44 ms |
2236 KB |
Output is correct |
37 |
Correct |
10 ms |
2236 KB |
Output is correct |
38 |
Correct |
8 ms |
2236 KB |
Output is correct |
39 |
Correct |
64 ms |
2236 KB |
Output is correct |
40 |
Correct |
54 ms |
2236 KB |
Output is correct |
41 |
Correct |
100 ms |
2236 KB |
Output is correct |
42 |
Correct |
99 ms |
2236 KB |
Output is correct |
43 |
Correct |
46 ms |
2236 KB |
Output is correct |
44 |
Correct |
62 ms |
2236 KB |
Output is correct |
45 |
Correct |
14 ms |
2236 KB |
Output is correct |
46 |
Correct |
5 ms |
2236 KB |
Output is correct |
47 |
Correct |
91 ms |
2236 KB |
Output is correct |
48 |
Correct |
65 ms |
2236 KB |
Output is correct |
49 |
Correct |
128 ms |
2236 KB |
Output is correct |
50 |
Correct |
122 ms |
2236 KB |
Output is correct |
51 |
Correct |
25 ms |
2240 KB |
Output is correct |
52 |
Correct |
97 ms |
2240 KB |
Output is correct |
53 |
Correct |
9 ms |
2240 KB |
Output is correct |
54 |
Correct |
86 ms |
2240 KB |
Output is correct |
55 |
Correct |
6 ms |
2240 KB |
Output is correct |
56 |
Correct |
116 ms |
2240 KB |
Output is correct |
57 |
Correct |
98 ms |
2240 KB |
Output is correct |
58 |
Correct |
129 ms |
2240 KB |
Output is correct |
59 |
Correct |
88 ms |
2240 KB |
Output is correct |
60 |
Correct |
84 ms |
2240 KB |
Output is correct |
61 |
Correct |
7 ms |
2240 KB |
Output is correct |
62 |
Correct |
8 ms |
2240 KB |
Output is correct |
63 |
Correct |
7 ms |
2240 KB |
Output is correct |
64 |
Correct |
6 ms |
2240 KB |
Output is correct |
65 |
Correct |
6 ms |
2240 KB |
Output is correct |
66 |
Correct |
7 ms |
2240 KB |
Output is correct |
67 |
Correct |
7 ms |
2240 KB |
Output is correct |
68 |
Correct |
5 ms |
2240 KB |
Output is correct |
69 |
Correct |
9 ms |
2240 KB |
Output is correct |
70 |
Correct |
8 ms |
2240 KB |
Output is correct |
71 |
Partially correct |
168 ms |
2240 KB |
Partially correct - number of queries: 5253 |
72 |
Correct |
15 ms |
2240 KB |
Output is correct |
73 |
Partially correct |
154 ms |
2240 KB |
Partially correct - number of queries: 5192 |
74 |
Partially correct |
170 ms |
2240 KB |
Partially correct - number of queries: 5211 |
75 |
Correct |
7 ms |
2240 KB |
Output is correct |
76 |
Correct |
150 ms |
2240 KB |
Output is correct |
77 |
Correct |
146 ms |
2240 KB |
Output is correct |
78 |
Correct |
11 ms |
2240 KB |
Output is correct |
79 |
Correct |
39 ms |
2240 KB |
Output is correct |
80 |
Correct |
83 ms |
2240 KB |
Output is correct |
81 |
Correct |
135 ms |
2240 KB |
Output is correct |
82 |
Correct |
68 ms |
2240 KB |
Output is correct |
83 |
Correct |
8 ms |
2240 KB |
Output is correct |
84 |
Correct |
44 ms |
2240 KB |
Output is correct |
85 |
Correct |
65 ms |
2240 KB |
Output is correct |
86 |
Correct |
5 ms |
2240 KB |
Output is correct |
87 |
Correct |
9 ms |
2240 KB |
Output is correct |
88 |
Correct |
7 ms |
2240 KB |
Output is correct |
89 |
Correct |
7 ms |
2240 KB |
Output is correct |
90 |
Correct |
8 ms |
2240 KB |
Output is correct |
91 |
Correct |
7 ms |
2240 KB |
Output is correct |
92 |
Correct |
5 ms |
2240 KB |
Output is correct |
93 |
Correct |
10 ms |
2240 KB |
Output is correct |
94 |
Correct |
8 ms |
2240 KB |
Output is correct |
95 |
Correct |
9 ms |
2240 KB |
Output is correct |
96 |
Correct |
9 ms |
2240 KB |
Output is correct |
97 |
Correct |
7 ms |
2240 KB |
Output is correct |