oj.uz

Submission #637620

# Submission time Handle Problem Language Result Execution time Memory
637620 2022-09-02T13:15:50 Z boris_mihov The Big Prize (IOI17_prize) C++17
90 / 100
 85 ms 1920 KB 
#include "prize.h"
#include <algorithm>
#include <iostream>
#include <cassert>
#include <numeric>
#include <vector>

typedef long long llong;
const int MAXN = 200000 + 10;
const int INF  = 1e9;

int ans, n;
std::vector <int> res;
std::pair <int,int> asked[MAXN];
inline std::pair <int,int> query(int pos)
{
    assert(1 <= pos && pos <= n);
    if (asked[pos].first != -1) return asked[pos];
    res = ask(pos - 1);
    asked[pos] = {res[0], res[1]};
    if (res[0] == 0 && res[1] == 0) ans = pos;
    return asked[pos];
}

int leftCnt;
int rightCnt;
int cntBig;
int binaryCnt;

int binarySearchLeft(int from, int to)
{
    int l = from, r = to, mid;
    while (l < r - 1)
    {
        mid = (l + r) / 2;
        auto [left, right] = query(mid);
        if (ans != 0) return 0;
        if (left + right != cntBig)
        {
            r = mid;
            continue;
        }

        if (left != leftCnt)
        {
            r = mid;
            continue;
        }

        l = mid;
    }

    query(r);
    leftCnt++;
    return r;
}

int binarySearchRight(int from, int to)
{
    int l = from, r = to, mid;
    while (l < r - 1)
    {
        mid = (l + r) / 2;
        auto [left, right] = query(mid);
        if (ans != 0) return 0;
        if (left + right != cntBig)
        {
            l = mid;
            continue;
        }

        if (right != rightCnt)
        {
            l = mid;
            continue;
        }

        r = mid;
    }

    query(l);
    rightCnt++;
    return l;
}

int find_best(int N) 
{
    n = N;
	srand(6686889);
    std::fill(asked + 1, asked + 1 + n, std::make_pair(-1, -1));
    for (int i = 1 ; i <= std::min(n, 500) ; ++i)
    {
        query(i);
        cntBig = std::max(cntBig, asked[i].first + asked[i].second);
    }

    if (ans != 0) return ans - 1;
    for (int i = 1 ; i <= 500 ; ++i)    
    {
        leftCnt += (asked[i].first + asked[i].second != cntBig);
    }

    int l = 447, r = n + 1;
    while (ans == 0 && l < r - 1)
    {
        if (rand()%2 == 0) l = binarySearchLeft(l, r);
        else               r = binarySearchRight(l, r);
    }

    if (ans == 0 && l != 0) query(l);
    if (ans == 0 && r != n + 1) query(r);
    assert(asked[ans].first == 0 && asked[ans].second == 0);
    return ans - 1;
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 1832 KB Output is correct
2 Correct 3 ms 1836 KB Output is correct
3 Correct 4 ms 1832 KB Output is correct
4 Correct 7 ms 1824 KB Output is correct
5 Correct 5 ms 1840 KB Output is correct
6 Correct 5 ms 1824 KB Output is correct
7 Correct 3 ms 1744 KB Output is correct
8 Correct 3 ms 1744 KB Output is correct
9 Correct 3 ms 1832 KB Output is correct
10 Correct 5 ms 1744 KB Output is correct

Subtask #2
70.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 1840 KB Output is correct
2 Correct 4 ms 1744 KB Output is correct
3 Correct 3 ms 1844 KB Output is correct
4 Correct 3 ms 1832 KB Output is correct
5 Correct 7 ms 1920 KB Output is correct
6 Correct 4 ms 1744 KB Output is correct
7 Correct 3 ms 1836 KB Output is correct
8 Correct 3 ms 1840 KB Output is correct
9 Correct 4 ms 1836 KB Output is correct
10 Correct 5 ms 1744 KB Output is correct
11 Correct 10 ms 1736 KB Output is correct
12 Correct 5 ms 1836 KB Output is correct
13 Correct 5 ms 1744 KB Output is correct
14 Correct 11 ms 464 KB Output is correct
15 Correct 11 ms 1840 KB Output is correct
16 Correct 25 ms 1832 KB Output is correct
17 Correct 6 ms 1828 KB Output is correct
18 Correct 6 ms 1836 KB Output is correct
19 Correct 3 ms 1832 KB Output is correct
20 Correct 30 ms 1068 KB Output is correct
21 Partially correct 48 ms 1840 KB Partially correct - number of queries: 6258
22 Correct 17 ms 1744 KB Output is correct
23 Correct 6 ms 1744 KB Output is correct
24 Correct 3 ms 1872 KB Output is correct
25 Partially correct 47 ms 1836 KB Partially correct - number of queries: 7757
26 Partially correct 74 ms 1836 KB Partially correct - number of queries: 7875
27 Correct 4 ms 1736 KB Output is correct
28 Correct 9 ms 1824 KB Output is correct
29 Correct 21 ms 1744 KB Output is correct
30 Correct 5 ms 1828 KB Output is correct
31 Correct 5 ms 1736 KB Output is correct
32 Correct 10 ms 1812 KB Output is correct
33 Correct 1 ms 208 KB Output is correct
34 Partially correct 36 ms 1836 KB Partially correct - number of queries: 5345
35 Correct 6 ms 1840 KB Output is correct
36 Correct 18 ms 1836 KB Output is correct
37 Correct 6 ms 1736 KB Output is correct
38 Correct 5 ms 1744 KB Output is correct
39 Partially correct 62 ms 1840 KB Partially correct - number of queries: 7043
40 Correct 3 ms 1840 KB Output is correct
41 Partially correct 55 ms 1744 KB Partially correct - number of queries: 6476
42 Partially correct 50 ms 1744 KB Partially correct - number of queries: 6476
43 Partially correct 51 ms 1836 KB Partially correct - number of queries: 6995
44 Partially correct 51 ms 1824 KB Partially correct - number of queries: 6625
45 Partially correct 58 ms 1744 KB Partially correct - number of queries: 5457
46 Correct 4 ms 1832 KB Output is correct
47 Partially correct 59 ms 1836 KB Partially correct - number of queries: 7427
48 Partially correct 43 ms 1744 KB Partially correct - number of queries: 5087
49 Correct 17 ms 1744 KB Output is correct
50 Correct 6 ms 1828 KB Output is correct
51 Partially correct 51 ms 1828 KB Partially correct - number of queries: 6652
52 Correct 3 ms 1828 KB Output is correct
53 Correct 5 ms 1832 KB Output is correct
54 Partially correct 61 ms 1744 KB Partially correct - number of queries: 6865
55 Correct 5 ms 1816 KB Output is correct
56 Correct 6 ms 1832 KB Output is correct
57 Partially correct 20 ms 1832 KB Partially correct - number of queries: 5166
58 Partially correct 22 ms 1840 KB Partially correct - number of queries: 5105
59 Partially correct 60 ms 1836 KB Partially correct - number of queries: 6476
60 Partially correct 57 ms 1744 KB Partially correct - number of queries: 7316
61 Correct 4 ms 1828 KB Output is correct
62 Correct 5 ms 1740 KB Output is correct
63 Correct 3 ms 1744 KB Output is correct
64 Correct 5 ms 1744 KB Output is correct
65 Correct 5 ms 1836 KB Output is correct
66 Correct 4 ms 1840 KB Output is correct
67 Correct 8 ms 1744 KB Output is correct
68 Correct 4 ms 1824 KB Output is correct
69 Correct 6 ms 1840 KB Output is correct
70 Correct 6 ms 1836 KB Output is correct
71 Partially correct 74 ms 1744 KB Partially correct - number of queries: 8326
72 Correct 9 ms 1744 KB Output is correct
73 Partially correct 71 ms 1744 KB Partially correct - number of queries: 8205
74 Partially correct 85 ms 1744 KB Partially correct - number of queries: 8239
75 Correct 7 ms 1744 KB Output is correct
76 Partially correct 30 ms 1748 KB Partially correct - number of queries: 7135
77 Partially correct 41 ms 1744 KB Partially correct - number of queries: 8179
78 Correct 10 ms 1744 KB Output is correct
79 Correct 37 ms 1744 KB Output is correct
80 Partially correct 69 ms 1744 KB Partially correct - number of queries: 8177
81 Partially correct 73 ms 1744 KB Partially correct - number of queries: 7923
82 Partially correct 71 ms 1744 KB Partially correct - number of queries: 8081
83 Correct 4 ms 1832 KB Output is correct
84 Partially correct 55 ms 1744 KB Partially correct - number of queries: 6702
85 Partially correct 65 ms 1768 KB Partially correct - number of queries: 8125
86 Correct 4 ms 1744 KB Output is correct
87 Correct 6 ms 1744 KB Output is correct
88 Correct 5 ms 1744 KB Output is correct
89 Correct 3 ms 1840 KB Output is correct
90 Correct 5 ms 1744 KB Output is correct
91 Correct 5 ms 1836 KB Output is correct
92 Correct 6 ms 1744 KB Output is correct
93 Correct 8 ms 1744 KB Output is correct
94 Correct 14 ms 1744 KB Output is correct
95 Correct 11 ms 1744 KB Output is correct
96 Correct 8 ms 1744 KB Output is correct
97 Correct 5 ms 1744 KB Output is correct