Submission #98441

# Submission time Handle Problem Language Result Execution time Memory
98441 2019-02-23T17:24:25 Z bogdan10bos The Big Prize (IOI17_prize) C++14
99.05 / 100
60 ms 900 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++)
    {
        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;
         ^~~
# Verdict Execution time Memory Grader output
1 Correct 5 ms 412 KB Output is correct
2 Correct 9 ms 384 KB Output is correct
3 Correct 8 ms 376 KB Output is correct
4 Correct 6 ms 568 KB Output is correct
5 Correct 5 ms 436 KB Output is correct
6 Correct 9 ms 256 KB Output is correct
7 Correct 5 ms 456 KB Output is correct
8 Correct 5 ms 572 KB Output is correct
9 Correct 7 ms 432 KB Output is correct
10 Correct 8 ms 376 KB Output is correct
# Verdict Execution time Memory Grader output
1 Correct 6 ms 440 KB Output is correct
2 Correct 10 ms 376 KB Output is correct
3 Correct 11 ms 376 KB Output is correct
4 Correct 12 ms 376 KB Output is correct
5 Correct 5 ms 432 KB Output is correct
6 Correct 6 ms 256 KB Output is correct
7 Correct 5 ms 440 KB Output is correct
8 Correct 9 ms 384 KB Output is correct
9 Correct 9 ms 384 KB Output is correct
10 Correct 8 ms 376 KB Output is correct
11 Correct 8 ms 436 KB Output is correct
12 Correct 5 ms 340 KB Output is correct
13 Correct 11 ms 504 KB Output is correct
14 Correct 5 ms 436 KB Output is correct
15 Correct 15 ms 376 KB Output is correct
16 Correct 36 ms 780 KB Output is correct
17 Correct 5 ms 412 KB Output is correct
18 Partially correct 53 ms 676 KB Partially correct - number of queries: 5033
19 Correct 8 ms 256 KB Output is correct
20 Correct 16 ms 376 KB Output is correct
21 Correct 19 ms 636 KB Output is correct
22 Correct 13 ms 304 KB Output is correct
23 Correct 9 ms 256 KB Output is correct
24 Correct 4 ms 344 KB Output is correct
25 Correct 36 ms 504 KB Output is correct
26 Correct 28 ms 564 KB Output is correct
27 Correct 5 ms 432 KB Output is correct
28 Correct 46 ms 652 KB Output is correct
29 Correct 38 ms 580 KB Output is correct
30 Partially correct 49 ms 812 KB Partially correct - number of queries: 5043
31 Correct 8 ms 384 KB Output is correct
32 Correct 9 ms 376 KB Output is correct
33 Correct 2 ms 256 KB Output is correct
34 Correct 15 ms 540 KB Output is correct
35 Correct 11 ms 384 KB Output is correct
36 Correct 8 ms 492 KB Output is correct
37 Correct 7 ms 256 KB Output is correct
38 Correct 10 ms 256 KB Output is correct
39 Correct 22 ms 424 KB Output is correct
40 Correct 41 ms 656 KB Output is correct
41 Correct 16 ms 664 KB Output is correct
42 Correct 28 ms 584 KB Output is correct
43 Correct 24 ms 552 KB Output is correct
44 Correct 26 ms 508 KB Output is correct
45 Correct 18 ms 376 KB Output is correct
46 Correct 7 ms 384 KB Output is correct
47 Correct 27 ms 552 KB Output is correct
48 Correct 37 ms 660 KB Output is correct
49 Correct 10 ms 304 KB Output is correct
50 Partially correct 28 ms 840 KB Partially correct - number of queries: 5038
51 Correct 25 ms 504 KB Output is correct
52 Correct 9 ms 384 KB Output is correct
53 Correct 9 ms 564 KB Output is correct
54 Correct 26 ms 472 KB Output is correct
55 Correct 7 ms 256 KB Output is correct
56 Partially correct 40 ms 676 KB Partially correct - number of queries: 5040
57 Correct 38 ms 676 KB Output is correct
58 Correct 31 ms 548 KB Output is correct
59 Correct 19 ms 648 KB Output is correct
60 Correct 16 ms 584 KB Output is correct
61 Correct 10 ms 376 KB Output is correct
62 Correct 5 ms 412 KB Output is correct
63 Correct 6 ms 440 KB Output is correct
64 Correct 9 ms 376 KB Output is correct
65 Correct 7 ms 564 KB Output is correct
66 Correct 14 ms 392 KB Output is correct
67 Correct 18 ms 364 KB Output is correct
68 Correct 11 ms 304 KB Output is correct
69 Correct 17 ms 404 KB Output is correct
70 Correct 12 ms 312 KB Output is correct
71 Partially correct 28 ms 768 KB Partially correct - number of queries: 5090
72 Correct 12 ms 424 KB Output is correct
73 Partially correct 59 ms 856 KB Partially correct - number of queries: 5029
74 Partially correct 55 ms 680 KB Partially correct - number of queries: 5051
75 Correct 9 ms 376 KB Output is correct
76 Correct 52 ms 724 KB Output is correct
77 Partially correct 60 ms 768 KB Partially correct - number of queries: 5064
78 Correct 8 ms 412 KB Output is correct
79 Correct 32 ms 632 KB Output is correct
80 Partially correct 28 ms 900 KB Partially correct - number of queries: 5035
81 Partially correct 34 ms 772 KB Partially correct - number of queries: 5078
82 Partially correct 44 ms 768 KB Partially correct - number of queries: 5018
83 Correct 14 ms 448 KB Output is correct
84 Correct 52 ms 808 KB Output is correct
85 Partially correct 36 ms 776 KB Partially correct - number of queries: 5095
86 Correct 31 ms 672 KB Output is correct
87 Correct 13 ms 360 KB Output is correct
88 Correct 38 ms 632 KB Output is correct
89 Correct 28 ms 504 KB Output is correct
90 Correct 6 ms 396 KB Output is correct
91 Correct 12 ms 516 KB Output is correct
92 Correct 24 ms 504 KB Output is correct
93 Correct 46 ms 684 KB Output is correct
94 Correct 36 ms 632 KB Output is correct
95 Correct 39 ms 632 KB Output is correct
96 Correct 43 ms 700 KB Output is correct
97 Correct 36 ms 556 KB Output is correct