oj.uz

Submission #52384

# Submission time Handle Problem Language Result Execution time Memory
52384 2018-06-25T17:19:26 Z WLZ The Big Prize (IOI17_prize) C++17
100 / 100
 54 ms 956 KB 
#include "prize.h"
#include <vector>
#include <stack>
#include <utility>
#include <map>

std::map<int, std::map<int, std::pair<int, int> > > mp;

int find_best(int n) {
    std::stack< std::pair<int, int> > st;
    st.emplace(0, n - 1);
    while (!st.empty()) {
        int lo = st.top().first;
        int hi = st.top().second;
        st.pop();
        int mid = (lo + hi) / 2;
        std::vector<int> q = ask(mid);
        int l = q[0], r = q[1];
        // the same type nodes are mp[l+r], key in mp[l+r] is the possible possition
        // sort mp[l+r]'s key using upper_bound to find the first position that is after mid
        // if for that position p1, r[p1] == r[mid], then we know we don't need push right interval
        // upper_bound -1 is the position that is before or equal to mid
        // if for that position p2, l[p2] == l[mid], then we know we don't need push left interval
        auto rIt = mp[l + r].upper_bound(mid);

        bool processLeft = true, processRight = true;
        if (!(rIt == mp[l + r].begin())) {
            // check if left interval can be ignored
            auto lIt = rIt; --lIt;
            if (lIt->second.first == l) {
                processLeft = false;
            }
        }
        if ((!(rIt == mp[l + r].end()) && rIt->second.second == r)||(r == 0)) {
            processRight = false;
        }

        
        mp[l + r][mid] = {l, r};
        if (l == 0 && r == 0) return mid;
        if (l == 0) st = std::stack< std::pair<int, int> >();
        if (lo != mid && processLeft) st.emplace(lo, mid - 1);
        if (hi != mid && processRight) st.emplace(mid + 1, hi);
    }
	return 0;
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 248 KB Output is correct
2 Correct 2 ms 308 KB Output is correct
3 Correct 2 ms 472 KB Output is correct
4 Correct 4 ms 472 KB Output is correct
5 Correct 2 ms 484 KB Output is correct
6 Correct 2 ms 484 KB Output is correct
7 Correct 2 ms 484 KB Output is correct
8 Correct 2 ms 488 KB Output is correct
9 Correct 3 ms 488 KB Output is correct
10 Correct 2 ms 504 KB Output is correct

Subtask #2
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 532 KB Output is correct
2 Correct 2 ms 532 KB Output is correct
3 Correct 2 ms 532 KB Output is correct
4 Correct 2 ms 532 KB Output is correct
5 Correct 2 ms 532 KB Output is correct
6 Correct 2 ms 532 KB Output is correct
7 Correct 2 ms 532 KB Output is correct
8 Correct 2 ms 532 KB Output is correct
9 Correct 1 ms 556 KB Output is correct
10 Correct 2 ms 556 KB Output is correct
11 Correct 4 ms 572 KB Output is correct
12 Correct 5 ms 572 KB Output is correct
13 Correct 2 ms 572 KB Output is correct
14 Correct 7 ms 572 KB Output is correct
15 Correct 16 ms 788 KB Output is correct
16 Correct 8 ms 788 KB Output is correct
17 Correct 42 ms 808 KB Output is correct
18 Correct 3 ms 808 KB Output is correct
19 Correct 54 ms 828 KB Output is correct
20 Correct 9 ms 828 KB Output is correct
21 Correct 30 ms 828 KB Output is correct
22 Correct 32 ms 828 KB Output is correct
23 Correct 2 ms 828 KB Output is correct
24 Correct 6 ms 828 KB Output is correct
25 Correct 20 ms 828 KB Output is correct
26 Correct 9 ms 828 KB Output is correct
27 Correct 3 ms 828 KB Output is correct
28 Correct 4 ms 828 KB Output is correct
29 Correct 8 ms 828 KB Output is correct
30 Correct 3 ms 828 KB Output is correct
31 Correct 38 ms 828 KB Output is correct
32 Correct 2 ms 828 KB Output is correct
33 Correct 2 ms 828 KB Output is correct
34 Correct 34 ms 828 KB Output is correct
35 Correct 2 ms 828 KB Output is correct
36 Correct 46 ms 828 KB Output is correct
37 Correct 4 ms 828 KB Output is correct
38 Correct 2 ms 828 KB Output is correct
39 Correct 34 ms 828 KB Output is correct
40 Correct 2 ms 828 KB Output is correct
41 Correct 17 ms 828 KB Output is correct
42 Correct 25 ms 828 KB Output is correct
43 Correct 18 ms 828 KB Output is correct
44 Correct 25 ms 828 KB Output is correct
45 Correct 22 ms 828 KB Output is correct
46 Correct 43 ms 828 KB Output is correct
47 Correct 25 ms 828 KB Output is correct
48 Correct 6 ms 828 KB Output is correct
49 Correct 40 ms 828 KB Output is correct
50 Correct 2 ms 828 KB Output is correct
51 Correct 21 ms 828 KB Output is correct
52 Correct 40 ms 828 KB Output is correct
53 Correct 2 ms 828 KB Output is correct
54 Correct 21 ms 828 KB Output is correct
55 Correct 19 ms 844 KB Output is correct
56 Correct 2 ms 844 KB Output is correct
57 Correct 15 ms 844 KB Output is correct
58 Correct 12 ms 844 KB Output is correct
59 Correct 15 ms 844 KB Output is correct
60 Correct 10 ms 844 KB Output is correct
61 Correct 1 ms 844 KB Output is correct
62 Correct 2 ms 844 KB Output is correct
63 Correct 2 ms 844 KB Output is correct
64 Correct 2 ms 844 KB Output is correct
65 Correct 2 ms 844 KB Output is correct
66 Correct 2 ms 844 KB Output is correct
67 Correct 2 ms 844 KB Output is correct
68 Correct 2 ms 844 KB Output is correct
69 Correct 2 ms 844 KB Output is correct
70 Correct 2 ms 844 KB Output is correct
71 Correct 44 ms 844 KB Output is correct
72 Correct 5 ms 844 KB Output is correct
73 Correct 37 ms 844 KB Output is correct
74 Correct 38 ms 956 KB Output is correct
75 Correct 2 ms 956 KB Output is correct
76 Correct 32 ms 956 KB Output is correct
77 Correct 34 ms 956 KB Output is correct
78 Correct 5 ms 956 KB Output is correct
79 Correct 19 ms 956 KB Output is correct
80 Correct 36 ms 956 KB Output is correct
81 Correct 37 ms 956 KB Output is correct
82 Correct 20 ms 956 KB Output is correct
83 Correct 3 ms 956 KB Output is correct
84 Correct 30 ms 956 KB Output is correct
85 Correct 36 ms 956 KB Output is correct
86 Correct 5 ms 956 KB Output is correct
87 Correct 3 ms 956 KB Output is correct
88 Correct 5 ms 956 KB Output is correct
89 Correct 5 ms 956 KB Output is correct
90 Correct 2 ms 956 KB Output is correct
91 Correct 4 ms 956 KB Output is correct
92 Correct 3 ms 956 KB Output is correct
93 Correct 4 ms 956 KB Output is correct
94 Correct 4 ms 956 KB Output is correct
95 Correct 4 ms 956 KB Output is correct
96 Correct 3 ms 956 KB Output is correct
97 Correct 2 ms 956 KB Output is correct