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Submission #532356

# Submission time Handle Problem Language Result Execution time Memory
532356 2022-03-02T18:19:47 Z Alex_tz307 Izbori (COCI22_izbori) C++17
110 / 110
 142 ms 6980 KB 
#include <bits/stdc++.h>

using namespace std;

const int kN = 1 << 18;
int a[kN];
int64_t ans, f[kN << 1];
bitset<kN> used;

void solve(int l, int r) {
  if (l == r) {
    ++ans;
    return;
  }
  int mid = (l + r) >> 1;
  solve(l, mid);
  solve(mid + 1, r);
  vector<int> candidates;
  for (int i = l; i <= r; ++i) {
    f[a[i]] = 0;
    used[a[i]] = false;
  }
  for (int i = mid; i >= l; --i) {
    if (++f[a[i]] > (mid - i + 1) / 2 && !used[a[i]]) {
      candidates.emplace_back(a[i]);
      used[a[i]] = true;
    }
  }
  for (int i = l; i <= mid; ++i) {
    f[a[i]] = 0;
  }
  for (int i = mid + 1; i <= r; ++i) {
    if (++f[a[i]] > (i - mid) / 2 && !used[a[i]]) {
      candidates.emplace_back(a[i]);
      used[a[i]] = true;
    }
  }
  int len = r - l + 1;
  for (const int &x : candidates) {
    for (int i = -len - 1; i <= len + 1; ++i) {
      f[i + kN] = 0;
    }
    int sum = 0;
    for (int i = mid; i >= l; --i) {
      if (a[i] == x) {
        ++sum;
      } else {
        --sum;
      }
      ++f[sum + kN];
    }
    for (int i = len; i >= -len - 1; --i) {
      f[i + kN] += f[i + 1 + kN];
    }
    sum = 0;
    for (int i = mid + 1; i <= r; ++i) {
      if (a[i] == x) {
        ++sum;
      } else {
        --sum;
      }
      ans += f[-sum + 1 + kN];
    }
  }
}

void testCase() {
  int n;
  cin >> n;
  vector<int> v;
  v.resize(n);
  for (int i = 1; i <= n; ++i) {
    cin >> a[i];
    v[i - 1] = a[i];
  }
  sort(v.begin(), v.end());
  v.erase(unique(v.begin(), v.end()), v.end());
  for (int i = 1; i <= n; ++i) {
    a[i] = distance(v.begin(), lower_bound(v.begin(), v.end(), a[i]));
  }
  solve(1, n);
  cout << ans << '\n';
}

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr);
  int tests = 1;
  for (int tc = 1; tc <= tests; ++tc) {
    testCase();
  }
  return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 376 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 320 KB Output is correct
6 Correct 1 ms 332 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 376 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 320 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 328 KB Output is correct
10 Correct 1 ms 328 KB Output is correct
11 Correct 2 ms 332 KB Output is correct
12 Correct 2 ms 332 KB Output is correct
13 Correct 2 ms 332 KB Output is correct
14 Correct 2 ms 332 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 1 ms 332 KB Output is correct
17 Correct 1 ms 332 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 85 ms 3652 KB Output is correct
2 Correct 116 ms 4676 KB Output is correct
3 Correct 64 ms 2944 KB Output is correct
4 Correct 118 ms 4840 KB Output is correct
5 Correct 129 ms 5096 KB Output is correct
6 Correct 132 ms 5364 KB Output is correct
7 Correct 128 ms 5356 KB Output is correct
8 Correct 131 ms 5316 KB Output is correct
9 Correct 132 ms 5384 KB Output is correct
10 Correct 130 ms 5316 KB Output is correct
11 Correct 85 ms 5380 KB Output is correct

Subtask #4
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 376 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 320 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 328 KB Output is correct
10 Correct 1 ms 328 KB Output is correct
11 Correct 2 ms 332 KB Output is correct
12 Correct 2 ms 332 KB Output is correct
13 Correct 2 ms 332 KB Output is correct
14 Correct 2 ms 332 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 1 ms 332 KB Output is correct
17 Correct 1 ms 332 KB Output is correct
18 Correct 85 ms 3652 KB Output is correct
19 Correct 116 ms 4676 KB Output is correct
20 Correct 64 ms 2944 KB Output is correct
21 Correct 118 ms 4840 KB Output is correct
22 Correct 129 ms 5096 KB Output is correct
23 Correct 132 ms 5364 KB Output is correct
24 Correct 128 ms 5356 KB Output is correct
25 Correct 131 ms 5316 KB Output is correct
26 Correct 132 ms 5384 KB Output is correct
27 Correct 130 ms 5316 KB Output is correct
28 Correct 85 ms 5380 KB Output is correct
29 Correct 101 ms 6916 KB Output is correct
30 Correct 25 ms 1720 KB Output is correct
31 Correct 58 ms 3116 KB Output is correct
32 Correct 142 ms 6456 KB Output is correct
33 Correct 57 ms 3268 KB Output is correct
34 Correct 63 ms 3316 KB Output is correct
35 Correct 38 ms 2240 KB Output is correct
36 Correct 22 ms 1604 KB Output is correct
37 Correct 27 ms 1732 KB Output is correct
38 Correct 124 ms 5388 KB Output is correct
39 Correct 120 ms 5312 KB Output is correct
40 Correct 126 ms 5316 KB Output is correct
41 Correct 120 ms 5372 KB Output is correct
42 Correct 121 ms 5368 KB Output is correct
43 Correct 127 ms 6872 KB Output is correct
44 Correct 127 ms 6948 KB Output is correct
45 Correct 127 ms 6980 KB Output is correct
46 Correct 127 ms 6968 KB Output is correct
47 Correct 126 ms 6892 KB Output is correct
48 Correct 123 ms 5676 KB Output is correct
49 Correct 125 ms 5648 KB Output is correct
50 Correct 124 ms 5524 KB Output is correct
51 Correct 118 ms 5532 KB Output is correct
52 Correct 112 ms 5696 KB Output is correct
53 Correct 110 ms 5680 KB Output is correct
54 Correct 112 ms 5572 KB Output is correct