Submission #139680

#	Time	Username	Problem	Language	Result	Execution time	Memory
139680		baluteshih	Strange Device (APIO19_strange_device)	C++14	100 / 100	747 ms	17900 KiB

strange_device

#pragma GCC optimize("O3")
#include <bits/stdc++.h>
#define jizz ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
#define pb push_back
#define MP make_pair
#define F first
#define S second
#define ET cout << "\n"
#define MEM(i,j) memset(i,j,sizeof i)
#define ALL(v) v.begin(),v.end()
#define DB(a,s,e) {for(int i=s;i<e;++i) cerr << a[i] << " ";ET;}
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

vector<pll> v;
 
int main()
{jizz
	ll n,a,b,l,r,ans=0,g;
	__int128 cycle;
	cin >> n >> a >> b,g=a/__gcd(b+1,a),cycle=(__int128)g*b;
	for(int i=1;i<=n;++i)
	{
		cin >> l >> r;
		if((__int128)(r-l+1)>=cycle)
			return cout << (ll)cycle << "\n",0;
		if(l%cycle<=r%cycle)
			v.pb(MP((ll)l%cycle,(ll)r%cycle));
		else
			v.pb(MP((ll)l%cycle,(ll)cycle-1)),v.pb(MP(0LL,(ll)r%cycle));
	}
	sort(ALL(v)),r=-1;
	for(auto i:v)
	{
		if(i.F<=r) ans+=max(i.S-r,0LL),r=max(i.S,r);
		else ans+=i.S-i.F+1,r=i.S;
	}
	cout << ans << "\n";
}

• 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