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Submission #94472

# Submission time Handle Problem Language Result Execution time Memory
94472 2019-01-19T03:42:32 Z wxh010910 The Big Prize (IOI17_prize) C++17
100 / 100
 50 ms 2216 KB 
#include <bits/stdc++.h>
#include "prize.h"

using namespace std;

int find_best(int n) {
  vector<pair<int, int>> ans(n);
  unordered_map<int, set<int>> s;
  function<int(int, int)> solve = [&](int l, int r) {
    if (l > r) {
      return -1;
    }
    int mid = l + r >> 1;
    vector<int> a = ask(mid);
    ans[mid] = make_pair(a[0], a[1]);
    int sum = ans[mid].first + ans[mid].second;
    if (!sum) {
      return mid;
    }
    auto it = s[sum].insert(mid).first;
    if (it == s[sum].begin() || ans[*prev(it)].first != ans[mid].first) {
      int res = solve(l, mid - 1);
      if (res != -1) {
        return res;
      }
    }
    if (it == --s[sum].end() || ans[*next(it)].second != ans[mid].second) {
      int res = solve(mid + 1, r);
      if (res != -1) {
        return res;
      }
    }
    return -1;
  };
  return solve(0, n - 1);
}

Compilation message

prize.cpp: In lambda function:
prize.cpp:13:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     int mid = l + r >> 1;
               ~~^~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 1928 KB Output is correct
2 Correct 3 ms 1848 KB Output is correct
3 Correct 5 ms 1784 KB Output is correct
4 Correct 3 ms 1960 KB Output is correct
5 Correct 3 ms 1828 KB Output is correct
6 Correct 3 ms 1784 KB Output is correct
7 Correct 3 ms 1972 KB Output is correct
8 Correct 3 ms 1912 KB Output is correct
9 Correct 3 ms 1852 KB Output is correct
10 Correct 3 ms 1788 KB Output is correct

Subtask #2
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 1932 KB Output is correct
2 Correct 3 ms 1948 KB Output is correct
3 Correct 3 ms 2104 KB Output is correct
4 Correct 3 ms 1960 KB Output is correct
5 Correct 3 ms 1844 KB Output is correct
6 Correct 4 ms 1784 KB Output is correct
7 Correct 3 ms 1976 KB Output is correct
8 Correct 3 ms 2024 KB Output is correct
9 Correct 3 ms 1852 KB Output is correct
10 Correct 3 ms 1912 KB Output is correct
11 Correct 5 ms 1784 KB Output is correct
12 Correct 3 ms 1988 KB Output is correct
13 Correct 9 ms 1912 KB Output is correct
14 Correct 4 ms 504 KB Output is correct
15 Correct 9 ms 1980 KB Output is correct
16 Correct 19 ms 2056 KB Output is correct
17 Correct 3 ms 1784 KB Output is correct
18 Correct 26 ms 2104 KB Output is correct
19 Correct 3 ms 1928 KB Output is correct
20 Correct 6 ms 1252 KB Output is correct
21 Correct 19 ms 1976 KB Output is correct
22 Correct 7 ms 1812 KB Output is correct
23 Correct 3 ms 1832 KB Output is correct
24 Correct 3 ms 1912 KB Output is correct
25 Correct 12 ms 2072 KB Output is correct
26 Correct 23 ms 2096 KB Output is correct
27 Correct 3 ms 1908 KB Output is correct
28 Correct 48 ms 2104 KB Output is correct
29 Correct 24 ms 2116 KB Output is correct
30 Correct 50 ms 2088 KB Output is correct
31 Correct 3 ms 1844 KB Output is correct
32 Correct 6 ms 1784 KB Output is correct
33 Correct 2 ms 248 KB Output is correct
34 Correct 18 ms 2040 KB Output is correct
35 Correct 4 ms 1928 KB Output is correct
36 Correct 7 ms 2000 KB Output is correct
37 Correct 4 ms 1912 KB Output is correct
38 Correct 3 ms 1784 KB Output is correct
39 Correct 12 ms 2088 KB Output is correct
40 Correct 40 ms 2104 KB Output is correct
41 Correct 28 ms 1912 KB Output is correct
42 Correct 24 ms 1960 KB Output is correct
43 Correct 22 ms 2000 KB Output is correct
44 Correct 20 ms 1912 KB Output is correct
45 Correct 19 ms 1960 KB Output is correct
46 Correct 3 ms 1784 KB Output is correct
47 Correct 11 ms 2040 KB Output is correct
48 Correct 39 ms 2040 KB Output is correct
49 Correct 7 ms 1784 KB Output is correct
50 Correct 33 ms 2024 KB Output is correct
51 Correct 19 ms 2040 KB Output is correct
52 Correct 4 ms 1912 KB Output is correct
53 Correct 6 ms 1788 KB Output is correct
54 Correct 20 ms 1912 KB Output is correct
55 Correct 3 ms 1848 KB Output is correct
56 Correct 42 ms 2088 KB Output is correct
57 Correct 17 ms 2052 KB Output is correct
58 Correct 33 ms 2028 KB Output is correct
59 Correct 26 ms 2112 KB Output is correct
60 Correct 21 ms 2040 KB Output is correct
61 Correct 4 ms 1924 KB Output is correct
62 Correct 3 ms 1896 KB Output is correct
63 Correct 4 ms 1976 KB Output is correct
64 Correct 4 ms 1840 KB Output is correct
65 Correct 3 ms 1784 KB Output is correct
66 Correct 3 ms 1784 KB Output is correct
67 Correct 3 ms 1856 KB Output is correct
68 Correct 4 ms 1840 KB Output is correct
69 Correct 4 ms 1784 KB Output is correct
70 Correct 3 ms 1788 KB Output is correct
71 Correct 48 ms 2040 KB Output is correct
72 Correct 8 ms 1836 KB Output is correct
73 Correct 40 ms 2088 KB Output is correct
74 Correct 44 ms 2080 KB Output is correct
75 Correct 6 ms 1784 KB Output is correct
76 Correct 36 ms 2044 KB Output is correct
77 Correct 44 ms 2216 KB Output is correct
78 Correct 5 ms 1976 KB Output is correct
79 Correct 27 ms 1912 KB Output is correct
80 Correct 23 ms 2024 KB Output is correct
81 Correct 40 ms 2104 KB Output is correct
82 Correct 42 ms 2100 KB Output is correct
83 Correct 5 ms 1848 KB Output is correct
84 Correct 39 ms 2044 KB Output is correct
85 Correct 46 ms 2096 KB Output is correct
86 Correct 10 ms 1912 KB Output is correct
87 Correct 4 ms 1972 KB Output is correct
88 Correct 10 ms 1912 KB Output is correct
89 Correct 7 ms 1912 KB Output is correct
90 Correct 4 ms 1784 KB Output is correct
91 Correct 7 ms 1912 KB Output is correct
92 Correct 3 ms 1784 KB Output is correct
93 Correct 5 ms 1912 KB Output is correct
94 Correct 6 ms 1912 KB Output is correct
95 Correct 13 ms 1912 KB Output is correct
96 Correct 4 ms 1904 KB Output is correct
97 Correct 3 ms 1784 KB Output is correct