Submission #277998

#	Time	Username	Problem	Language	Result	Execution time	Memory
277998		toonewbie	Strange Device (APIO19_strange_device)	C++17	100 / 100	914 ms	100232 KiB

strange_device

#include <bits/stdc++.h>
using namespace std;

typedef long long lint;
const lint LNF = 2e18;

int n;
lint A, B;

lint gcd(lint a, lint b){ return (b==0 ? a : gcd(b, a%b)); }

int main(){
  ios::sync_with_stdio(0); cin.tie(0);

  cin>>n>>A>>B;
  lint g = gcd(A, B+1), a=A/g;
  lint T = LNF;
  if(a<=LNF/B) T = a*B;

  map<lint, int> mp;
  for(int i=1; i<=n; i++){
    lint l,r; cin>>l>>r;
    if(r-l+1>=T) mp[0]++, mp[T]--;
    else{
      l%=T, r%=T;
      if(l<=r) mp[l]++, mp[r+1]--;
      else mp[0]++, mp[r+1]--, mp[l]++, mp[T]--;
    }
  }
  mp[T] = 0;
  lint xp = 0, cnt = 0, ans = 0;
  for(auto p:mp){
    lint x = p.first;
    if(cnt>0) ans += x-xp;
    cnt+=p.second;
    xp =  x;
  }
  cout<<ans<<'\n';

  return 0;
}

• 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