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Submission #613935

# Submission time Handle Problem Language Result Execution time Memory
613935 2022-07-30T13:45:35 Z Mamedov The Big Prize (IOI17_prize) C++17
100 / 100
 77 ms 12144 KB 
#pragma GCC optimize ("O3")
#include "prize.h"
#include <bits/stdc++.h>
#define pii pair<int, int>
#define piii pair<pii, int>
#define vi vector<int>
#define vvi vector<vi>
#define vpii vector<pii>
#define vvpii vector<vpii>
#define f first
#define s second
#define oo 1000000001
#define eb emplace_back
#define pb push_back
#define mpr make_pair
#define size(v) (int)v.size()
#define ln '\n'
#define ull unsigned long long
#define ll long long
#define all(v) v.begin(), v.end()

using namespace std;

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

const int up = 2e5 + 5;
int okay = 0;
vi cnt[up];

vi ASK(int i) {
  if (cnt[i][0] != oo) return cnt[i];
  else return ask(i);
}

void solve(int l, int r, int subL, int subR) {
  if (l <= r) {
    int mid = (l + r) >> 1;
    vi a = ASK(mid);
    if (a[0] + a[1] < okay) { /// not last type
      int lmid = mid - 1, rmid = mid + 1;
      cnt[mid] = a;
      while (lmid >= l) {
        a = ASK(lmid);
        if (a[0] + a[1] < okay) {
          cnt[lmid] = a;
          --lmid;
        } else {
          break;
        }
      }
      if (a[0] - subL > 0 && lmid > l) {
        solve(l, lmid - 1, subL, a[1]);
      }
      while (rmid <= r) {
        a = ASK(rmid);
        if (a[0] + a[1] < okay) {
          cnt[rmid] = a;
          ++rmid;
        } else {
          break;
        }
      }
      if (a[1] - subR > 0 && rmid < r) {
        solve(rmid + 1, r, a[0], subR);
      }
    } else { /// last type
      if (a[0] - subL > 0) {
        solve(l, mid - 1, subL, a[1]);
      }
      if (a[1] - subR > 0) {
        solve(mid + 1, r, a[0], subR);
      }
    }
  }
}
int find_best(int n) {
  vi p(n);
  for (int i = 0; i < n; ++i) {
    p[i] = i;
    cnt[i] = {oo, oo};
  }
  shuffle(all(p), rng);
  for (int i = 0; i < n && i < 473; ++i) {  /// type_cnt[1, 4, 21, 446, last] 1 + 4 + 21 + 446 = 472
    cnt[p[i]] = ASK(p[i]);
    okay = max(okay, cnt[p[i]][0] + cnt[p[i]][1]);
    if (okay > 26) break;   /// 1 + 4 + 21 = 26
  }
  solve(0, n - 1, 0, 0);
  for (int i = 0; i < n; ++i) {
    if (cnt[i][0] + cnt[i][1] == 0) return i;
  }
}

Compilation message

prize.cpp: In function 'int find_best(int)':
prize.cpp:77:9: warning: control reaches end of non-void function [-Wreturn-type]
   77 |   vi p(n);
      |         ^

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 21 ms 12024 KB Output is correct
2 Correct 22 ms 11976 KB Output is correct
3 Correct 20 ms 11984 KB Output is correct
4 Correct 20 ms 12056 KB Output is correct
5 Correct 17 ms 12056 KB Output is correct
6 Correct 24 ms 12040 KB Output is correct
7 Correct 20 ms 12024 KB Output is correct
8 Correct 20 ms 12028 KB Output is correct
9 Correct 17 ms 12036 KB Output is correct
10 Correct 22 ms 12060 KB Output is correct

Subtask #2
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 23 ms 12040 KB Output is correct
2 Correct 23 ms 11940 KB Output is correct
3 Correct 21 ms 12036 KB Output is correct
4 Correct 20 ms 12048 KB Output is correct
5 Correct 22 ms 12060 KB Output is correct
6 Correct 24 ms 12044 KB Output is correct
7 Correct 23 ms 11984 KB Output is correct
8 Correct 20 ms 12044 KB Output is correct
9 Correct 24 ms 12044 KB Output is correct
10 Correct 20 ms 12068 KB Output is correct
11 Correct 19 ms 12032 KB Output is correct
12 Correct 20 ms 12036 KB Output is correct
13 Correct 24 ms 11984 KB Output is correct
14 Correct 15 ms 5712 KB Output is correct
15 Correct 54 ms 12024 KB Output is correct
16 Correct 58 ms 12036 KB Output is correct
17 Correct 62 ms 12048 KB Output is correct
18 Correct 59 ms 12036 KB Output is correct
19 Correct 54 ms 12048 KB Output is correct
20 Correct 45 ms 8452 KB Output is correct
21 Correct 49 ms 11976 KB Output is correct
22 Correct 29 ms 12144 KB Output is correct
23 Correct 23 ms 12024 KB Output is correct
24 Correct 19 ms 11984 KB Output is correct
25 Correct 59 ms 12040 KB Output is correct
26 Correct 56 ms 12024 KB Output is correct
27 Correct 21 ms 11984 KB Output is correct
28 Correct 56 ms 11972 KB Output is correct
29 Correct 40 ms 12032 KB Output is correct
30 Correct 35 ms 12064 KB Output is correct
31 Correct 61 ms 12036 KB Output is correct
32 Correct 25 ms 12028 KB Output is correct
33 Correct 4 ms 4944 KB Output is correct
34 Correct 50 ms 12032 KB Output is correct
35 Correct 19 ms 12040 KB Output is correct
36 Correct 65 ms 11976 KB Output is correct
37 Correct 18 ms 11976 KB Output is correct
38 Correct 24 ms 12020 KB Output is correct
39 Correct 55 ms 12032 KB Output is correct
40 Correct 56 ms 12028 KB Output is correct
41 Correct 53 ms 12036 KB Output is correct
42 Correct 43 ms 12108 KB Output is correct
43 Correct 40 ms 12032 KB Output is correct
44 Correct 51 ms 12040 KB Output is correct
45 Correct 40 ms 12048 KB Output is correct
46 Correct 59 ms 12028 KB Output is correct
47 Correct 34 ms 12052 KB Output is correct
48 Correct 62 ms 11976 KB Output is correct
49 Correct 62 ms 12016 KB Output is correct
50 Correct 57 ms 11980 KB Output is correct
51 Correct 60 ms 11976 KB Output is correct
52 Correct 60 ms 12040 KB Output is correct
53 Correct 21 ms 11976 KB Output is correct
54 Correct 46 ms 12040 KB Output is correct
55 Correct 59 ms 11992 KB Output is correct
56 Correct 34 ms 12040 KB Output is correct
57 Correct 35 ms 12036 KB Output is correct
58 Correct 62 ms 12032 KB Output is correct
59 Correct 53 ms 12036 KB Output is correct
60 Correct 32 ms 12060 KB Output is correct
61 Correct 25 ms 12028 KB Output is correct
62 Correct 20 ms 11984 KB Output is correct
63 Correct 20 ms 11984 KB Output is correct
64 Correct 17 ms 12004 KB Output is correct
65 Correct 15 ms 12028 KB Output is correct
66 Correct 22 ms 12024 KB Output is correct
67 Correct 18 ms 12056 KB Output is correct
68 Correct 19 ms 11976 KB Output is correct
69 Correct 23 ms 11984 KB Output is correct
70 Correct 19 ms 12028 KB Output is correct
71 Correct 54 ms 11984 KB Output is correct
72 Correct 19 ms 12052 KB Output is correct
73 Correct 61 ms 11984 KB Output is correct
74 Correct 66 ms 12060 KB Output is correct
75 Correct 22 ms 12048 KB Output is correct
76 Correct 60 ms 12064 KB Output is correct
77 Correct 47 ms 11984 KB Output is correct
78 Correct 19 ms 11984 KB Output is correct
79 Correct 45 ms 11952 KB Output is correct
80 Correct 40 ms 12056 KB Output is correct
81 Correct 47 ms 12052 KB Output is correct
82 Correct 57 ms 11984 KB Output is correct
83 Correct 21 ms 11984 KB Output is correct
84 Correct 61 ms 11984 KB Output is correct
85 Correct 68 ms 12052 KB Output is correct
86 Correct 39 ms 11984 KB Output is correct
87 Correct 26 ms 12036 KB Output is correct
88 Correct 25 ms 12068 KB Output is correct
89 Correct 24 ms 12044 KB Output is correct
90 Correct 25 ms 12044 KB Output is correct
91 Correct 32 ms 12048 KB Output is correct
92 Correct 35 ms 11940 KB Output is correct
93 Correct 43 ms 12064 KB Output is correct
94 Correct 50 ms 12048 KB Output is correct
95 Correct 77 ms 11984 KB Output is correct
96 Correct 43 ms 12048 KB Output is correct
97 Correct 47 ms 11984 KB Output is correct