oj.uz

Submission #98443

# Submission time Handle Problem Language Result Execution time Memory
98443 2019-02-23T17:27:51 Z bogdan10bos The Big Prize (IOI17_prize) C++14
20 / 100
 97 ms 1144 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 < 350; 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 7 ms 256 KB Output is correct
2 Correct 8 ms 384 KB Output is correct
3 Correct 6 ms 344 KB Output is correct
4 Correct 15 ms 376 KB Output is correct
5 Correct 12 ms 364 KB Output is correct
6 Correct 6 ms 404 KB Output is correct
7 Correct 9 ms 304 KB Output is correct
8 Correct 10 ms 316 KB Output is correct
9 Correct 9 ms 368 KB Output is correct
10 Correct 8 ms 312 KB Output is correct

Subtask #2
0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 296 KB Output is correct
2 Correct 3 ms 364 KB Output is correct
3 Correct 8 ms 384 KB Output is correct
4 Correct 9 ms 256 KB Output is correct
5 Correct 10 ms 376 KB Output is correct
6 Correct 6 ms 328 KB Output is correct
7 Correct 10 ms 376 KB Output is correct
8 Correct 9 ms 384 KB Output is correct
9 Correct 11 ms 504 KB Output is correct
10 Correct 9 ms 256 KB Output is correct
11 Correct 6 ms 448 KB Output is correct
12 Correct 7 ms 384 KB Output is correct
13 Correct 6 ms 412 KB Output is correct
14 Correct 5 ms 312 KB Output is correct
15 Correct 8 ms 452 KB Output is correct
16 Correct 68 ms 632 KB Output is correct
17 Correct 6 ms 256 KB Output is correct
18 Correct 46 ms 760 KB Output is correct
19 Correct 6 ms 304 KB Output is correct
20 Correct 19 ms 504 KB Output is correct
21 Correct 22 ms 500 KB Output is correct
22 Correct 5 ms 452 KB Output is correct
23 Correct 7 ms 256 KB Output is correct
24 Correct 6 ms 384 KB Output is correct
25 Correct 27 ms 568 KB Output is correct
26 Correct 36 ms 596 KB Output is correct
27 Correct 9 ms 256 KB Output is correct
28 Correct 53 ms 648 KB Output is correct
29 Correct 42 ms 632 KB Output is correct
30 Correct 49 ms 724 KB Output is correct
31 Correct 6 ms 304 KB Output is correct
32 Correct 13 ms 384 KB Output is correct
33 Correct 3 ms 384 KB Output is correct
34 Correct 21 ms 396 KB Output is correct
35 Correct 9 ms 376 KB Output is correct
36 Correct 17 ms 420 KB Output is correct
37 Correct 6 ms 384 KB Output is correct
38 Correct 5 ms 340 KB Output is correct
39 Correct 18 ms 520 KB Output is correct
40 Correct 47 ms 632 KB Output is correct
41 Correct 29 ms 680 KB Output is correct
42 Correct 32 ms 584 KB Output is correct
43 Correct 27 ms 504 KB Output is correct
44 Correct 25 ms 440 KB Output is correct
45 Correct 20 ms 376 KB Output is correct
46 Correct 7 ms 304 KB Output is correct
47 Correct 29 ms 504 KB Output is correct
48 Correct 31 ms 584 KB Output is correct
49 Correct 9 ms 384 KB Output is correct
50 Correct 49 ms 716 KB Output is correct
51 Correct 22 ms 504 KB Output is correct
52 Correct 4 ms 408 KB Output is correct
53 Correct 9 ms 308 KB Output is correct
54 Correct 23 ms 452 KB Output is correct
55 Correct 6 ms 384 KB Output is correct
56 Correct 54 ms 760 KB Output is correct
57 Correct 40 ms 552 KB Output is correct
58 Correct 35 ms 568 KB Output is correct
59 Correct 27 ms 592 KB Output is correct
60 Correct 38 ms 520 KB Output is correct
61 Correct 6 ms 436 KB Output is correct
62 Correct 7 ms 384 KB Output is correct
63 Correct 10 ms 376 KB Output is correct
64 Correct 10 ms 256 KB Output is correct
65 Correct 10 ms 376 KB Output is correct
66 Correct 7 ms 420 KB Output is correct
67 Correct 14 ms 384 KB Output is correct
68 Correct 11 ms 376 KB Output is correct
69 Correct 8 ms 416 KB Output is correct
70 Correct 11 ms 376 KB Output is correct
71 Correct 48 ms 680 KB Output is correct
72 Correct 16 ms 376 KB Output is correct
73 Correct 58 ms 680 KB Output is correct
74 Correct 57 ms 760 KB Output is correct
75 Correct 6 ms 468 KB Output is correct
76 Correct 39 ms 668 KB Output is correct
77 Correct 35 ms 692 KB Output is correct
78 Correct 14 ms 376 KB Output is correct
79 Correct 34 ms 504 KB Output is correct
80 Correct 32 ms 688 KB Output is correct
81 Correct 51 ms 772 KB Output is correct
82 Correct 51 ms 760 KB Output is correct
83 Correct 9 ms 408 KB Output is correct
84 Correct 47 ms 632 KB Output is correct
85 Correct 59 ms 760 KB Output is correct
86 Correct 18 ms 772 KB Output is correct
87 Correct 7 ms 384 KB Output is correct
88 Correct 32 ms 476 KB Output is correct
89 Correct 12 ms 648 KB Output is correct
90 Correct 10 ms 312 KB Output is correct
91 Correct 24 ms 504 KB Output is correct
92 Correct 20 ms 504 KB Output is correct
93 Incorrect 97 ms 1144 KB Incorrect
94 Halted 0 ms 0 KB -