Submission #120571

#	Time	Username	Problem	Language	Result	Execution time	Memory
120571		IOrtroiii	Strange Device (APIO19_strange_device)	C++14	100 / 100	991 ms	33464 KiB

strange_device

#include <bits/stdc++.h>

using namespace std;

using ll = long long;
const ll inf = 4e18;

ll mul(ll a, ll b) {
   if (a > (inf / b)) {
      return inf;
   } else {
      return a * b;
   }
}

int main() {
   ios_base::sync_with_stdio(false);
   int n;
   cin >> n;
   ll A, B;
   cin >> A >> B;
   A /= __gcd(A, B + 1);
   ll C = mul(A, B);
   vector<pair<ll, int>> go;
   for (int i = 0; i < n; ++i) {
      ll l, r;
      cin >> l >> r;
      if (r - l + 1 >= C) {
         go.emplace_back(0, 1);
         go.emplace_back(C, -1);
      } else if (l % C <= r % C) {
         l %= C, r %= C;
         go.emplace_back(l, 1);
         go.emplace_back(r + 1, -1);
      } else {
         l %= C, r %= C;
         go.emplace_back(l, 1);
         go.emplace_back(C, -1);
         go.emplace_back(0, 1);
         go.emplace_back(r + 1, -1);
      }
   }
   sort(go.begin(), go.end());
   ll ans = 0;
   int l = 0;
   int cnt = 0;
   while (l < go.size()) {
      int r = l;
      while (r < go.size() && go[r].first == go[l].first) {
         cnt += go[r++].second;
      }
      if (cnt) {
         ans += go[r].first - go[l].first;
      }
      l = r;
   }
   cout << ans << "\n";
}

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:47:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    while (l < go.size()) {
           ~~^~~~~~~~~~~
strange_device.cpp:49:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       while (r < go.size() && go[r].first == go[l].first) {
              ~~^~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
• Subtask 4: 5 / 5
• Subtask 5: 5 / 5
• Subtask 6: 20 / 20
• Subtask 7: 20 / 20
• Subtask 8: 30 / 30