oj.uz

Submission #98442

# Submission time Handle Problem Language Result Execution time Memory
98442 2019-02-23T17:25:39 Z bogdan10bos The Big Prize (IOI17_prize) C++14
20 / 100
 94 ms 1176 KB 
#include <bits/stdc++.h>

#include "prize.h"

using namespace std;

typedef pair<int, int> pii;

int sq, mxcnt, ans;
map<int, int> mp[2];

pii myask(int pos)
{
    if(mp[0].count(pos))
        return {mp[0][pos], mp[1][pos]};

    auto v = ask(pos);
    mp[0][pos] = v[0];
    mp[1][pos] = v[1];
    return {v[0], v[1]};
}

void solve(int st, int dr)
{
    if(st > dr) return;
    if(ans != -1)   return;
    auto askst = myask(st);
    auto askdr = myask(dr);

    int sumst = askst.first + askst.second;
    int sumdr = askdr.first + askdr.second;

    if(sumst == 0)  { ans = st; return; }
    if(sumdr == 0)  { ans = dr; return; }

    if(askst.second == 0 || askdr.first == 0)   return;

    if(dr - st <= 1)    return;

    if(sumst != mxcnt)
    {
        solve(st + 1, dr);
        return;
    }

    if(sumdr != mxcnt)
    {
        solve(st, dr - 1);
        return;
    }

    int cnt = askdr.first - askst.first;
    if(cnt == 0)    return;

    int lgt = dr - st - 1;

    int mij = st + (dr - st) / 2;

    solve(st, mij);
    solve(mij, dr);
}

int find_best(int N)
{
    ans = -1;
    sq = sqrt(N) + 1;
    sq = min(sq, N);
    mxcnt = 0;

    mt19937 g(chrono::high_resolution_clock::now().time_since_epoch().count());
    uniform_int_distribution<int> uid(0, N - 1);

	for(int i = 0; i < sq && i < 300; i++)
    {
        int pos = uid(g);
        auto x = myask(pos);
        int sum = x.first + x.second;
        if(sum == 0)    ans = pos;
        mxcnt = max(mxcnt, sum);
    }
    int st = 0, dr = sq;
    for(; st < N; )
    {
        solve(st, dr);
        st += sq; dr += sq;
        if(dr >= N) dr = N - 1;
    }
    return ans;
}

Compilation message

prize.cpp: In function 'void solve(int, int)':
prize.cpp:55:9: warning: unused variable 'lgt' [-Wunused-variable]
     int lgt = dr - st - 1;
         ^~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 256 KB Output is correct
2 Correct 8 ms 248 KB Output is correct
3 Correct 6 ms 384 KB Output is correct
4 Correct 9 ms 376 KB Output is correct
5 Correct 7 ms 396 KB Output is correct
6 Correct 4 ms 412 KB Output is correct
7 Correct 4 ms 560 KB Output is correct
8 Correct 8 ms 376 KB Output is correct
9 Correct 7 ms 376 KB Output is correct
10 Correct 11 ms 512 KB Output is correct

Subtask #2
0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 256 KB Output is correct
2 Correct 6 ms 384 KB Output is correct
3 Correct 7 ms 304 KB Output is correct
4 Correct 11 ms 304 KB Output is correct
5 Correct 4 ms 448 KB Output is correct
6 Correct 4 ms 420 KB Output is correct
7 Correct 4 ms 412 KB Output is correct
8 Correct 7 ms 256 KB Output is correct
9 Correct 5 ms 452 KB Output is correct
10 Correct 10 ms 256 KB Output is correct
11 Correct 8 ms 384 KB Output is correct
12 Correct 6 ms 256 KB Output is correct
13 Correct 14 ms 384 KB Output is correct
14 Correct 6 ms 376 KB Output is correct
15 Correct 11 ms 356 KB Output is correct
16 Correct 41 ms 900 KB Output is correct
17 Correct 6 ms 304 KB Output is correct
18 Correct 59 ms 888 KB Output is correct
19 Correct 5 ms 384 KB Output is correct
20 Correct 8 ms 508 KB Output is correct
21 Correct 24 ms 504 KB Output is correct
22 Correct 6 ms 452 KB Output is correct
23 Correct 4 ms 268 KB Output is correct
24 Correct 6 ms 384 KB Output is correct
25 Correct 28 ms 524 KB Output is correct
26 Correct 22 ms 548 KB Output is correct
27 Correct 4 ms 424 KB Output is correct
28 Correct 63 ms 760 KB Output is correct
29 Correct 32 ms 704 KB Output is correct
30 Correct 65 ms 680 KB Output is correct
31 Correct 7 ms 384 KB Output is correct
32 Correct 10 ms 384 KB Output is correct
33 Correct 2 ms 384 KB Output is correct
34 Correct 10 ms 460 KB Output is correct
35 Correct 5 ms 436 KB Output is correct
36 Correct 11 ms 508 KB Output is correct
37 Correct 9 ms 392 KB Output is correct
38 Correct 6 ms 412 KB Output is correct
39 Correct 13 ms 600 KB Output is correct
40 Correct 32 ms 708 KB Output is correct
41 Correct 14 ms 596 KB Output is correct
42 Correct 17 ms 584 KB Output is correct
43 Correct 24 ms 576 KB Output is correct
44 Correct 15 ms 580 KB Output is correct
45 Correct 24 ms 364 KB Output is correct
46 Correct 3 ms 256 KB Output is correct
47 Correct 23 ms 496 KB Output is correct
48 Correct 43 ms 680 KB Output is correct
49 Correct 10 ms 428 KB Output is correct
50 Correct 37 ms 780 KB Output is correct
51 Correct 23 ms 468 KB Output is correct
52 Correct 5 ms 256 KB Output is correct
53 Correct 7 ms 436 KB Output is correct
54 Correct 25 ms 592 KB Output is correct
55 Correct 3 ms 344 KB Output is correct
56 Correct 48 ms 760 KB Output is correct
57 Correct 28 ms 632 KB Output is correct
58 Correct 17 ms 736 KB Output is correct
59 Correct 26 ms 580 KB Output is correct
60 Correct 34 ms 508 KB Output is correct
61 Correct 10 ms 428 KB Output is correct
62 Correct 6 ms 304 KB Output is correct
63 Correct 12 ms 396 KB Output is correct
64 Correct 9 ms 384 KB Output is correct
65 Correct 11 ms 308 KB Output is correct
66 Correct 13 ms 376 KB Output is correct
67 Correct 9 ms 376 KB Output is correct
68 Correct 10 ms 384 KB Output is correct
69 Correct 15 ms 392 KB Output is correct
70 Correct 12 ms 424 KB Output is correct
71 Correct 73 ms 840 KB Output is correct
72 Correct 14 ms 320 KB Output is correct
73 Correct 55 ms 752 KB Output is correct
74 Correct 53 ms 724 KB Output is correct
75 Correct 12 ms 432 KB Output is correct
76 Correct 25 ms 788 KB Output is correct
77 Correct 65 ms 868 KB Output is correct
78 Correct 14 ms 376 KB Output is correct
79 Correct 30 ms 504 KB Output is correct
80 Correct 57 ms 684 KB Output is correct
81 Correct 55 ms 832 KB Output is correct
82 Correct 52 ms 764 KB Output is correct
83 Correct 11 ms 376 KB Output is correct
84 Correct 40 ms 632 KB Output is correct
85 Correct 26 ms 700 KB Output is correct
86 Correct 39 ms 608 KB Output is correct
87 Correct 5 ms 316 KB Output is correct
88 Correct 29 ms 504 KB Output is correct
89 Correct 18 ms 488 KB Output is correct
90 Correct 12 ms 304 KB Output is correct
91 Correct 8 ms 312 KB Output is correct
92 Correct 21 ms 504 KB Output is correct
93 Incorrect 94 ms 1176 KB Incorrect
94 Halted 0 ms 0 KB -