oj.uz

Submission #98444

# Submission time Handle Problem Language Result Execution time Memory
98444 2019-02-23T17:29:15 Z bogdan10bos The Big Prize (IOI17_prize) C++14
20 / 100
 104 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 < 400; 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 10 ms 312 KB Output is correct
3 Correct 8 ms 256 KB Output is correct
4 Correct 15 ms 380 KB Output is correct
5 Correct 9 ms 376 KB Output is correct
6 Correct 6 ms 384 KB Output is correct
7 Correct 6 ms 452 KB Output is correct
8 Correct 10 ms 256 KB Output is correct
9 Correct 9 ms 384 KB Output is correct
10 Correct 10 ms 256 KB Output is correct

Subtask #2
0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 312 KB Output is correct
2 Correct 10 ms 376 KB Output is correct
3 Correct 11 ms 384 KB Output is correct
4 Correct 10 ms 376 KB Output is correct
5 Correct 10 ms 376 KB Output is correct
6 Correct 6 ms 544 KB Output is correct
7 Correct 7 ms 384 KB Output is correct
8 Correct 5 ms 436 KB Output is correct
9 Correct 5 ms 568 KB Output is correct
10 Correct 11 ms 512 KB Output is correct
11 Correct 8 ms 384 KB Output is correct
12 Correct 6 ms 316 KB Output is correct
13 Correct 15 ms 308 KB Output is correct
14 Correct 6 ms 328 KB Output is correct
15 Correct 15 ms 376 KB Output is correct
16 Correct 42 ms 604 KB Output is correct
17 Correct 7 ms 408 KB Output is correct
18 Correct 52 ms 736 KB Output is correct
19 Correct 8 ms 256 KB Output is correct
20 Correct 9 ms 620 KB Output is correct
21 Correct 13 ms 592 KB Output is correct
22 Correct 8 ms 376 KB Output is correct
23 Correct 5 ms 540 KB Output is correct
24 Correct 6 ms 256 KB Output is correct
25 Correct 28 ms 552 KB Output is correct
26 Correct 27 ms 632 KB Output is correct
27 Correct 7 ms 448 KB Output is correct
28 Correct 51 ms 656 KB Output is correct
29 Correct 29 ms 632 KB Output is correct
30 Partially correct 56 ms 736 KB Partially correct - number of queries: 5001
31 Correct 6 ms 256 KB Output is correct
32 Correct 11 ms 384 KB Output is correct
33 Correct 2 ms 384 KB Output is correct
34 Correct 22 ms 464 KB Output is correct
35 Correct 11 ms 376 KB Output is correct
36 Correct 16 ms 508 KB Output is correct
37 Correct 7 ms 256 KB Output is correct
38 Correct 4 ms 420 KB Output is correct
39 Correct 35 ms 464 KB Output is correct
40 Correct 53 ms 632 KB Output is correct
41 Correct 19 ms 652 KB Output is correct
42 Correct 25 ms 548 KB Output is correct
43 Correct 29 ms 452 KB Output is correct
44 Correct 20 ms 488 KB Output is correct
45 Correct 21 ms 456 KB Output is correct
46 Correct 4 ms 424 KB Output is correct
47 Correct 24 ms 436 KB Output is correct
48 Correct 25 ms 728 KB Output is correct
49 Correct 9 ms 384 KB Output is correct
50 Correct 44 ms 680 KB Output is correct
51 Correct 18 ms 516 KB Output is correct
52 Correct 9 ms 384 KB Output is correct
53 Correct 6 ms 436 KB Output is correct
54 Correct 24 ms 504 KB Output is correct
55 Correct 5 ms 536 KB Output is correct
56 Correct 40 ms 844 KB Output is correct
57 Correct 42 ms 836 KB Output is correct
58 Correct 35 ms 632 KB Output is correct
59 Correct 17 ms 580 KB Output is correct
60 Correct 32 ms 488 KB Output is correct
61 Correct 14 ms 296 KB Output is correct
62 Correct 6 ms 256 KB Output is correct
63 Correct 11 ms 376 KB Output is correct
64 Correct 10 ms 308 KB Output is correct
65 Correct 11 ms 376 KB Output is correct
66 Correct 7 ms 572 KB Output is correct
67 Correct 16 ms 404 KB Output is correct
68 Correct 13 ms 308 KB Output is correct
69 Correct 15 ms 432 KB Output is correct
70 Correct 12 ms 404 KB Output is correct
71 Partially correct 49 ms 808 KB Partially correct - number of queries: 5044
72 Correct 20 ms 424 KB Output is correct
73 Correct 55 ms 728 KB Output is correct
74 Partially correct 44 ms 708 KB Partially correct - number of queries: 5023
75 Correct 10 ms 384 KB Output is correct
76 Correct 49 ms 632 KB Output is correct
77 Partially correct 47 ms 760 KB Partially correct - number of queries: 5018
78 Correct 8 ms 396 KB Output is correct
79 Correct 35 ms 552 KB Output is correct
80 Partially correct 53 ms 848 KB Partially correct - number of queries: 5018
81 Correct 50 ms 760 KB Output is correct
82 Correct 46 ms 756 KB Output is correct
83 Correct 11 ms 304 KB Output is correct
84 Correct 44 ms 632 KB Output is correct
85 Partially correct 43 ms 700 KB Partially correct - number of queries: 5039
86 Correct 31 ms 664 KB Output is correct
87 Correct 10 ms 376 KB Output is correct
88 Correct 34 ms 504 KB Output is correct
89 Correct 21 ms 592 KB Output is correct
90 Correct 9 ms 316 KB Output is correct
91 Correct 27 ms 552 KB Output is correct
92 Correct 24 ms 436 KB Output is correct
93 Incorrect 104 ms 1144 KB Incorrect
94 Halted 0 ms 0 KB -