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Submission #187329

# Submission time Handle Problem Language Result Execution time Memory
187329 2020-01-12T17:21:40 Z popovicirobert The Big Prize (IOI17_prize) C++14
100 / 100
 71 ms 5548 KB 
#include "prize.h"
#include <bits/stdc++.h>

using namespace std;

static const int MAXN = (int) 2e5;

static bool mark[MAXN];
static vector <int> qry[MAXN];

static inline vector <int> myask(int pos) {
    if(mark[pos] == 0) {
        qry[pos] = ask(pos);
    }
    mark[pos] = 1;
    return qry[pos];
}


static int solve(int l, int r, int numl, int numr, int mx) {
    if(l > r) return -1;

    int mid = (l + r) / 2;

    int ll = mid, rr = mid;
    while(ll >= l && myask(ll)[0] + myask(ll)[1] < mx) {
        auto cur = myask(ll);
        if(cur[0] + cur[1] == 0) return ll;
        ll--;
    }
    while(rr <= r && myask(rr)[0] + myask(rr)[1] < mx) {
        auto cur = myask(rr);
        if(cur[0] + cur[1] == 0) return rr;
        rr++;
    }

    auto x = myask(max(ll, l)), y = myask(min(rr, r));
    int ans = -1;

    if(x[0] - numl > 0) {
        ans = max(ans, solve(l, ll - 1, numl, x[1], mx));
    }
    if(y[1] - numr > 0) {
        ans = max(ans, solve(rr + 1, r, y[0], numr, mx));
    }
    return ans;
}


int find_best(int n) {
    srand(time(NULL));

    auto myrand = [&]() {
        return (1LL * (1LL << 15) * rand() + rand()) % n;
    };

    vector <bool> vis(n);
    int mx = 0;

    for(int i = 0; i < min(n, 200); i++) {
        int p = myrand();
        while(vis[p]) { p = myrand(); }
        vis[p] = 1;
        auto cur = myask(p);
        mx = max(mx, cur[0] + cur[1]);
    }

    return solve(0, n - 1, 0, 0, mx);
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 5328 KB Output is correct
2 Correct 11 ms 5112 KB Output is correct
3 Correct 9 ms 5116 KB Output is correct
4 Correct 8 ms 5336 KB Output is correct
5 Correct 10 ms 5116 KB Output is correct
6 Correct 11 ms 5240 KB Output is correct
7 Correct 8 ms 5332 KB Output is correct
8 Correct 10 ms 5240 KB Output is correct
9 Correct 8 ms 5328 KB Output is correct
10 Correct 9 ms 5240 KB Output is correct

Subtask #2
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 5160 KB Output is correct
2 Correct 10 ms 5160 KB Output is correct
3 Correct 8 ms 5224 KB Output is correct
4 Correct 9 ms 5288 KB Output is correct
5 Correct 10 ms 5112 KB Output is correct
6 Correct 9 ms 5112 KB Output is correct
7 Correct 10 ms 5112 KB Output is correct
8 Correct 9 ms 5132 KB Output is correct
9 Correct 9 ms 5112 KB Output is correct
10 Correct 11 ms 5268 KB Output is correct
11 Correct 17 ms 5240 KB Output is correct
12 Correct 14 ms 5240 KB Output is correct
13 Correct 10 ms 5352 KB Output is correct
14 Correct 23 ms 5072 KB Output is correct
15 Correct 56 ms 5368 KB Output is correct
16 Correct 58 ms 5368 KB Output is correct
17 Correct 52 ms 5484 KB Output is correct
18 Correct 54 ms 5288 KB Output is correct
19 Correct 40 ms 5368 KB Output is correct
20 Correct 41 ms 5264 KB Output is correct
21 Correct 55 ms 5384 KB Output is correct
22 Correct 27 ms 5404 KB Output is correct
23 Correct 10 ms 5136 KB Output is correct
24 Correct 14 ms 5240 KB Output is correct
25 Correct 51 ms 5288 KB Output is correct
26 Correct 30 ms 5472 KB Output is correct
27 Correct 10 ms 5240 KB Output is correct
28 Correct 50 ms 5308 KB Output is correct
29 Correct 57 ms 5352 KB Output is correct
30 Correct 71 ms 5368 KB Output is correct
31 Correct 65 ms 5432 KB Output is correct
32 Correct 15 ms 5240 KB Output is correct
33 Correct 8 ms 4984 KB Output is correct
34 Correct 33 ms 5480 KB Output is correct
35 Correct 12 ms 5112 KB Output is correct
36 Correct 55 ms 5368 KB Output is correct
37 Correct 14 ms 5132 KB Output is correct
38 Correct 11 ms 5240 KB Output is correct
39 Correct 43 ms 5376 KB Output is correct
40 Correct 49 ms 5288 KB Output is correct
41 Correct 48 ms 5272 KB Output is correct
42 Correct 33 ms 5376 KB Output is correct
43 Correct 55 ms 5368 KB Output is correct
44 Correct 57 ms 5288 KB Output is correct
45 Correct 56 ms 5360 KB Output is correct
46 Correct 34 ms 5484 KB Output is correct
47 Correct 53 ms 5308 KB Output is correct
48 Correct 32 ms 5384 KB Output is correct
49 Correct 37 ms 5352 KB Output is correct
50 Correct 63 ms 5428 KB Output is correct
51 Correct 33 ms 5480 KB Output is correct
52 Correct 32 ms 5372 KB Output is correct
53 Correct 11 ms 5240 KB Output is correct
54 Correct 60 ms 5312 KB Output is correct
55 Correct 41 ms 5384 KB Output is correct
56 Correct 54 ms 5544 KB Output is correct
57 Correct 53 ms 5260 KB Output is correct
58 Correct 61 ms 5268 KB Output is correct
59 Correct 42 ms 5424 KB Output is correct
60 Correct 54 ms 5368 KB Output is correct
61 Correct 10 ms 5136 KB Output is correct
62 Correct 11 ms 5240 KB Output is correct
63 Correct 10 ms 5240 KB Output is correct
64 Correct 9 ms 5240 KB Output is correct
65 Correct 10 ms 5112 KB Output is correct
66 Correct 10 ms 5352 KB Output is correct
67 Correct 11 ms 5240 KB Output is correct
68 Correct 16 ms 5240 KB Output is correct
69 Correct 14 ms 5240 KB Output is correct
70 Correct 9 ms 5112 KB Output is correct
71 Correct 63 ms 5368 KB Output is correct
72 Correct 13 ms 5244 KB Output is correct
73 Correct 50 ms 5428 KB Output is correct
74 Correct 33 ms 5380 KB Output is correct
75 Correct 11 ms 5240 KB Output is correct
76 Correct 46 ms 5548 KB Output is correct
77 Correct 41 ms 5400 KB Output is correct
78 Correct 14 ms 5160 KB Output is correct
79 Correct 32 ms 5368 KB Output is correct
80 Correct 33 ms 5396 KB Output is correct
81 Correct 33 ms 5408 KB Output is correct
82 Correct 34 ms 5296 KB Output is correct
83 Correct 11 ms 5240 KB Output is correct
84 Correct 46 ms 5288 KB Output is correct
85 Correct 56 ms 5368 KB Output is correct
86 Correct 36 ms 5240 KB Output is correct
87 Correct 13 ms 5240 KB Output is correct
88 Correct 33 ms 5244 KB Output is correct
89 Correct 34 ms 5240 KB Output is correct
90 Correct 11 ms 5156 KB Output is correct
91 Correct 29 ms 5240 KB Output is correct
92 Correct 32 ms 5244 KB Output is correct
93 Correct 18 ms 5240 KB Output is correct
94 Correct 18 ms 5236 KB Output is correct
95 Correct 17 ms 5224 KB Output is correct
96 Correct 13 ms 5368 KB Output is correct
97 Correct 9 ms 5116 KB Output is correct