Submission #781656

#	Time	Username	Problem	Language	Result	Execution time	Memory
781656		andecaandeci	Strange Device (APIO19_strange_device)	C++17	20 / 100	474 ms	40724 KiB

strange_device

#include<bits/stdc++.h>
#define int long long
#define pii pair<int, int>
using namespace std;
const int MAX=1e18;
signed main() {
  ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  int n, a, b; cin >> n >> a >> b;
  priority_queue<pii, vector<pii>, greater<pii>> pq;
  int S=0;
  bool cut=1;
    while(n--) {
      int l, r; cin >> l >> r;
      pq.push({l, r});
      S+=r-l+1;
      if(S>(int)1e6) cut=0, S=0;
    }
    if(cut) {
      set<pair<int, int>> ans;
      while(!pq.empty()) {
      int i=pq.top().first, j=pq.top().second;
      pq.pop();
        while(i<=j) {
        while(!pq.empty() && pq.top().first==i) j=max(j, pq.top().second);
          ans.insert({(i+i/b)%a, i%b});
            i++;
        }
      }
      cout << ans.size() << '\n';
  } else {
    priority_queue<pii, vector<pii>, greater<pii>> to_ans;
      int Mod;
      if(a>(MAX+b-1)/b) Mod=1e18+1;
      else Mod=a*b;
      while(!pq.empty()) {
        int l=pq.top().first, r=pq.top().second;
        pq.pop();
        while(!pq.empty() && pq.top().first<=r) r=max(r, pq.top().second), pq.pop();
      if((l+Mod-1)/Mod*Mod+Mod-1<=r) {cout << Mod << '\n'; return 0;}
        if((l+Mod-1)/Mod*Mod<=r && l%Mod) to_ans.push({l%Mod, Mod-1}), to_ans.push({0, r%Mod});
        else to_ans.push({l%Mod, r%Mod});
      }
      int ans=0;
      while(!to_ans.empty()) {
        int l=to_ans.top().first, r=to_ans.top().second;
        to_ans.pop();
        while(!to_ans.empty() && to_ans.top().first<=r) r=max(r, to_ans.top().second), to_ans.pop(); 
      ans+=r-l+1;
    }
    cout << ans << '\n';
  }
    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
• Subtask 4: 0 / 5
• Subtask 5: 0 / 5
• Subtask 6: 0 / 20
• Subtask 7: 0 / 20
• Subtask 8: 0 / 30