Submission #346640

#	Time	Username	Problem	Language	Result	Execution time	Memory
346640		YJU	Strange Device (APIO19_strange_device)	C++14	5 / 100	1 ms	364 KiB

strange_device

#include<bits/stdc++.h>
#pragma GCC optimize("unroll-loops,no-stack-protector")
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<ll,ll> pll;
const ll MOD=1e9+7;
const ll MOD2=998244353;
const ll N=2e5+5;
const ld pi=acos(-1);
const ll INF=1e18;
#define SQ(i) ((i)*(i))
#define REP(i,n) for(ll i=0;i<n;i++)
#define REP1(i,n) for(ll i=1;i<=n;i++)
#define pb push_back
#define mp make_pair
#define X first
#define Y second
#define setp setprecision
#define lwb lower_bound
#define SZ(_a) (ll)_a.size()

ll n,a,b,ans,last=-1,x,y;
vector<pll> v;

int main(){
	ios_base::sync_with_stdio(0);cin.tie(0);
	cin>>n>>a>>b;
	ll g=__gcd(a,b+1);
	if((long double)a/g*b>1e18){
		REP(i,n)cin>>x>>y,ans+=y-x+1;
		cout<<ans<<"\n";return 0;
	}
	ll ab=(a/g*b);
	REP(i,n){
		cin>>x>>y;
		if(y-a+1>=ab){cout<<ab<<"\n";return 0;}
		x%=ab;y%=ab;
		if(x>y){
			v.pb(mp(x,ab-1));
			v.pb(mp(0,y));
		}else{
			v.pb(mp(x,y));
		}
	}
	sort(v.begin(),v.end());
	for(auto i:v){
		ans+=max(0LL,i.Y-max(last,i.X-1));
		last=max(last,i.Y);
	}
	cout<<min(ans,ab)<<"\n";
	return 0;
}

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