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Submission #1020175

# Submission time Handle Problem Language Result Execution time Memory
1020175 2024-07-11T16:18:49 Z avighna Strange Device (APIO19_strange_device) C++17
25 / 100
 1814 ms 524288 KB 
#include <bits/stdc++.h>

typedef long long ll;

int main() {
  std::ios_base::sync_with_stdio(false);
  std::cin.tie(nullptr);

  ll n, a, b;
  std::cin >> n >> a >> b;

  if (a <= b || b == 1) {
    // (2x % a, 0)
    // 2x % a == 0
    // if a is odd, then the cycle is of length a (the 2 will never
    // contribute)
    // if a is even, then the cycle of of length a/2
    ll cycle = a % 2 == 0 ? a / 2 : a;
    if (a <= b) {
      // w (B + 1) mod A = 0
      if (b / std::gcd(a, b + 1) >= (ll(1e18) + 1) / a) {
        cycle = ll(1e18) + 1;
      } else {
        cycle = a / std::gcd(a, b + 1) * b;
      }
    }
    std::vector<std::pair<ll, ll>> ranges;
    std::map<ll, ll> mp;
    while (n--) {
      ll l, r;
      std::cin >> l >> r;
      ll _l = l % cycle, _r = r % cycle;
      if (r - l + 1 >= cycle) {
        std::cout << cycle << "\n";
        return 0;
      }
      if (_l > _r) {
        ranges.push_back({_l, cycle - 1});
        ranges.push_back({0, _r});
      } else {
        ranges.push_back({_l, _r});
      }
    }
    for (auto &[l, r] : ranges) {
      mp[l] = std::max(mp[l], r);
    }
    ll right = 0;
    ll ans = 0;
    for (auto &i : mp) {
      if (i.second < right) {
        continue;
      }
      right = std::max(right, i.first);
      ans += i.second - right + 1;
      right = i.second + 1;
    }
    std::cout << ans << "\n";
    return 0;
  }

  std::set<std::pair<ll, ll>> st;
  while (n--) {
    ll l, r;
    std::cin >> l >> r;
    for (ll x = l; x <= r; ++x) {
      st.insert({(x + x / b) % a, x % b});
      //   std::cout << "(" << (x + x / b) % a << " " << x % b << "), ";
      //   std::cout << st.size() << "\n";
    }
  }
  std::cout << st.size() << "\n";
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 4 ms 1248 KB Output is correct
3 Correct 5 ms 1088 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 0 ms 456 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 344 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 21 ms 7256 KB Output is correct
17 Correct 44 ms 11744 KB Output is correct
18 Correct 1 ms 344 KB Output is correct

Subtask #2
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct

Subtask #3
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 99 ms 32196 KB Output is correct
3 Correct 1 ms 344 KB Output is correct
4 Correct 77 ms 30696 KB Output is correct
5 Correct 180 ms 41288 KB Output is correct

Subtask #4
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 465 ms 78524 KB Output is correct
3 Correct 486 ms 78504 KB Output is correct
4 Correct 503 ms 78500 KB Output is correct

Subtask #5
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 465 ms 78524 KB Output is correct
3 Correct 486 ms 78504 KB Output is correct
4 Correct 503 ms 78500 KB Output is correct
5 Correct 0 ms 344 KB Output is correct
6 Runtime error 1814 ms 524288 KB Execution killed with signal 9
7 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 465 ms 78524 KB Output is correct
3 Correct 486 ms 78504 KB Output is correct
4 Correct 503 ms 78500 KB Output is correct
5 Correct 1 ms 344 KB Output is correct
6 Correct 158 ms 62888 KB Output is correct
7 Runtime error 1448 ms 524288 KB Execution killed with signal 9
8 Halted 0 ms 0 KB -

Subtask #7
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 43 ms 8136 KB Output is correct
3 Correct 47 ms 8132 KB Output is correct
4 Runtime error 1563 ms 524288 KB Execution killed with signal 9
5 Halted 0 ms 0 KB -

Subtask #8
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 4 ms 1248 KB Output is correct
3 Correct 5 ms 1088 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 0 ms 456 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 344 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 21 ms 7256 KB Output is correct
17 Correct 44 ms 11744 KB Output is correct
18 Correct 1 ms 344 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 0 ms 344 KB Output is correct
25 Correct 99 ms 32196 KB Output is correct
26 Correct 1 ms 344 KB Output is correct
27 Correct 77 ms 30696 KB Output is correct
28 Correct 180 ms 41288 KB Output is correct
29 Correct 0 ms 344 KB Output is correct
30 Correct 465 ms 78524 KB Output is correct
31 Correct 486 ms 78504 KB Output is correct
32 Correct 503 ms 78500 KB Output is correct
33 Correct 0 ms 344 KB Output is correct
34 Runtime error 1814 ms 524288 KB Execution killed with signal 9
35 Halted 0 ms 0 KB -