oj.uz

Submission #221084

# Submission time Handle Problem Language Result Execution time Memory
221084 2020-04-09T13:55:47 Z emil_physmath The Big Prize (IOI17_prize) C++17
95.29 / 100
 70 ms 6144 KB 
#include "prize.h"
#include <algorithm>
#include <iostream>
#include <chrono>
#include <random>
#include <vector>
using namespace std;
#ifdef MANSON
mt19937 rng(305);
#else
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
#endif // MANSON

namespace
{
    const int maxN = 200000;
    const int mag = 1200;
    int n;

    vector<int> cache[maxN];
    inline vector<int> Ask(int i)
    {
        if (cache[i].size()) return cache[i];
        return cache[i] = ask(i);
    }
    int mx = 0;
    inline bool Cheapest(int i)
    {
        vector<int> res = Ask(i);
        bool f = (res[0] + res[1] >= mx);
        // cerr << i << " is" << (f ? " " : "n't ") << " a cheapy.\n";
        return f;
    }
    int Solve(int l, int r)
    {
        static uniform_int_distribution<int> rnd(1, 2);
        if (rnd(rng) == 2)
        {
            while (l <= r && !Cheapest(l))
            {
                vector<int> res = Ask(l);
                if (res[0] + res[1] == 0) return l;
                ++l;
            }
            if (l > r) return -1;
            int len = 1;
            for (int x = (1 << 17); x >= 1; x >>= 1)
            {
                int R = l + (len + x) - 1;
                if (R > r) continue;
                // if (!Cheapest(R)) continue;
                vector<int> res1 = Ask(l), res2 = Ask(R);
                if (res1[1] == res2[1])
                    len += x;
            }
            if (l + len <= r)
                return Solve(l + len, r);
            return -1;
        }
        while (l <= r && !Cheapest(r))
        {
            vector<int> res = Ask(r);
            if (res[0] + res[1] == 0) return r;
            --r;
        }
        if (l > r) return -1;
        int len = 1;
        for (int x = (1 << 17); x >= 1; x >>= 1)
        {
            int L = r - (len + x) + 1;
            if (L < l) continue;
            if (!Cheapest(L)) continue;
            vector<int> res1 = Ask(L), res2 = Ask(r);
            if (res1[1] == res2[1])
                len += x;
        }
        if (l <= r - len)
            return Solve(l, r - len);
        return -1;
    }
}

int find_best(int n_) {
    n = n_;
    vector<int> p(n);
    iota(p.begin(), p.end(), 0);
    shuffle(p.begin(), p.end(), rng);
    if (p.size() > 446) p.erase(p.begin() + 446, p.end());
    for (int i: p)
    {
        vector<int> res = Ask(i);
        mx = max(mx, res[0] + res[1]);
        if (res[0] + res[1] >= 22)
            break;
        if (res[0] + res[1] == 0) return i;
    }
    vector<int> x;
    for (int i = 0; i * mag < n; ++i)
        x.push_back(i);
    shuffle(x.begin(), x.end(), rng);
    for (int i: x)
    {
        int res = Solve(i * mag, min(i * mag + mag, n - 1));
        if (res != -1)
            return res;
    }
}

Compilation message

prize.cpp: In function 'int find_best(int)':
prize.cpp:107:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 22 ms 5880 KB Output is correct
2 Correct 27 ms 5880 KB Output is correct
3 Correct 16 ms 5936 KB Output is correct
4 Correct 22 ms 6008 KB Output is correct
5 Correct 20 ms 5880 KB Output is correct
6 Correct 19 ms 5888 KB Output is correct
7 Correct 17 ms 5936 KB Output is correct
8 Correct 20 ms 5880 KB Output is correct
9 Correct 24 ms 5880 KB Output is correct
10 Correct 17 ms 5888 KB Output is correct

Subtask #2
75.29 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 20 ms 5888 KB Output is correct
2 Correct 17 ms 5948 KB Output is correct
3 Correct 25 ms 5880 KB Output is correct
4 Correct 18 ms 5952 KB Output is correct
5 Correct 18 ms 5884 KB Output is correct
6 Correct 17 ms 5888 KB Output is correct
7 Correct 22 ms 5880 KB Output is correct
8 Correct 18 ms 5964 KB Output is correct
9 Correct 16 ms 5952 KB Output is correct
10 Correct 18 ms 5888 KB Output is correct
11 Correct 14 ms 5752 KB Output is correct
12 Correct 16 ms 5752 KB Output is correct
13 Correct 16 ms 5760 KB Output is correct
14 Correct 16 ms 5120 KB Output is correct
15 Correct 20 ms 5976 KB Output is correct
16 Correct 38 ms 6060 KB Output is correct
17 Correct 52 ms 5888 KB Output is correct
18 Correct 21 ms 5968 KB Output is correct
19 Correct 26 ms 5832 KB Output is correct
20 Correct 39 ms 5496 KB Output is correct
21 Correct 31 ms 5892 KB Output is correct
22 Correct 32 ms 5880 KB Output is correct
23 Correct 20 ms 5880 KB Output is correct
24 Correct 15 ms 5752 KB Output is correct
25 Partially correct 40 ms 6092 KB Partially correct - number of queries: 5327
26 Correct 38 ms 6004 KB Output is correct
27 Correct 19 ms 5888 KB Output is correct
28 Correct 16 ms 5888 KB Output is correct
29 Correct 57 ms 6008 KB Output is correct
30 Correct 19 ms 5760 KB Output is correct
31 Correct 24 ms 5880 KB Output is correct
32 Correct 15 ms 5888 KB Output is correct
33 Correct 8 ms 4992 KB Output is correct
34 Correct 39 ms 5880 KB Output is correct
35 Correct 25 ms 5880 KB Output is correct
36 Correct 31 ms 5880 KB Output is correct
37 Correct 20 ms 5880 KB Output is correct
38 Correct 17 ms 5940 KB Output is correct
39 Correct 23 ms 5976 KB Output is correct
40 Correct 36 ms 6016 KB Output is correct
41 Correct 37 ms 5888 KB Output is correct
42 Correct 39 ms 5888 KB Output is correct
43 Correct 47 ms 5880 KB Output is correct
44 Correct 29 ms 5880 KB Output is correct
45 Correct 45 ms 6092 KB Output is correct
46 Correct 20 ms 5828 KB Output is correct
47 Correct 55 ms 6008 KB Output is correct
48 Correct 18 ms 5884 KB Output is correct
49 Correct 54 ms 6092 KB Output is correct
50 Correct 29 ms 5932 KB Output is correct
51 Partially correct 57 ms 5924 KB Partially correct - number of queries: 5211
52 Correct 32 ms 5880 KB Output is correct
53 Correct 19 ms 5900 KB Output is correct
54 Correct 16 ms 5752 KB Output is correct
55 Partially correct 55 ms 6008 KB Partially correct - number of queries: 5024
56 Correct 49 ms 5880 KB Output is correct
57 Partially correct 55 ms 6144 KB Partially correct - number of queries: 5285
58 Correct 32 ms 5880 KB Output is correct
59 Correct 39 ms 5888 KB Output is correct
60 Correct 43 ms 6000 KB Output is correct
61 Correct 20 ms 5888 KB Output is correct
62 Correct 31 ms 5880 KB Output is correct
63 Correct 20 ms 5864 KB Output is correct
64 Correct 24 ms 5888 KB Output is correct
65 Correct 22 ms 5880 KB Output is correct
66 Correct 20 ms 5888 KB Output is correct
67 Correct 24 ms 5880 KB Output is correct
68 Correct 22 ms 5880 KB Output is correct
69 Correct 15 ms 5888 KB Output is correct
70 Correct 23 ms 5880 KB Output is correct
71 Partially correct 58 ms 6136 KB Partially correct - number of queries: 5235
72 Correct 23 ms 5888 KB Output is correct
73 Correct 52 ms 6008 KB Output is correct
74 Partially correct 51 ms 6008 KB Partially correct - number of queries: 5174
75 Correct 24 ms 6016 KB Output is correct
76 Correct 53 ms 6008 KB Output is correct
77 Partially correct 70 ms 6008 KB Partially correct - number of queries: 5471
78 Correct 20 ms 5888 KB Output is correct
79 Correct 38 ms 6136 KB Output is correct
80 Partially correct 53 ms 6008 KB Partially correct - number of queries: 5384
81 Partially correct 58 ms 6008 KB Partially correct - number of queries: 5253
82 Partially correct 59 ms 6008 KB Partially correct - number of queries: 5311
83 Correct 24 ms 5888 KB Output is correct
84 Correct 54 ms 6008 KB Output is correct
85 Partially correct 59 ms 6008 KB Partially correct - number of queries: 5312
86 Correct 27 ms 5888 KB Output is correct
87 Correct 19 ms 5880 KB Output is correct
88 Correct 30 ms 5888 KB Output is correct
89 Correct 19 ms 5888 KB Output is correct
90 Correct 21 ms 6000 KB Output is correct
91 Correct 26 ms 5888 KB Output is correct
92 Correct 19 ms 5884 KB Output is correct
93 Correct 31 ms 5888 KB Output is correct
94 Correct 28 ms 5852 KB Output is correct
95 Correct 27 ms 6012 KB Output is correct
96 Correct 29 ms 5888 KB Output is correct
97 Partially correct 56 ms 6008 KB Partially correct - number of queries: 5346