Submission #249889

#	Time	Username	Problem	Language	Result	Execution time	Memory
249889		Evirir	Strange Device (APIO19_strange_device)	C++17	100 / 100	774 ms	67272 KiB

strange_device

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;

#define watch(x) cout<<(#x)<<"="<<(x)<<'\n'
#define mset(d,val) memset(d,val,sizeof(d))
#define setp(x) cout<<fixed<<setprecision(x)
#define forn(i,a,b) for(int i=(a);i<(b);i++)
#define fore(i,a,b) for(int i=(a);i<=(b);i++)
#define pb push_back
#define F first
#define S second
#define pqueue priority_queue
#define fbo find_by_order
#define ook order_of_key
typedef long long ll;
typedef pair<ll,ll> ii;
typedef vector<ll> vi;
typedef vector<ii> vii;
typedef long double ld;
typedef tree<ll, null_type, less<ll>, rb_tree_tag, tree_order_statistics_node_update> pbds;
void amin(ll &a, ll b){ a=min(a,b); }
void amax(ll &a, ll b){ a=max(a,b); }
void YES(){cout<<"YES\n";} void NO(){cout<<"NO\n";}
void SD(int t=0){ cout<<"PASSED "<<t<<endl; }
const ll INF = ll(2e18);
const int MOD = 998244353;

const bool DEBUG = 0;
const int MAXN = 1000005;

bool cmp(ii a, ii b){
	if(a.F!=b.F) return a.F<b.F;
	return a.S>b.S;
}

ll n,A,B,P;
ii a[MAXN];
vii v,tmp;

int main()
{
	ios_base::sync_with_stdio(0); cin.tie(0);
	
	cin>>n>>A>>B;
	if(A/__gcd(A,B+1)>=INF/B) P=INF;
	else P=A/__gcd(A,B+1)*B;
	
	forn(i,0,n){
		cin>>a[i].F>>a[i].S;
		if(a[i].S-a[i].F+1>=P){
			cout<<P<<'\n';
			return 0;
		}
		a[i].F%=P;
		a[i].S%=P;
		if(a[i].F<=a[i].S){
			v.pb({a[i].F,a[i].S});
		}
		else{
			v.pb({a[i].F,P-1});
			v.pb({0,a[i].S});
		}
	}
	
	sort(v.begin(), v.end(), cmp);
	forn(i,0,v.size()){
		if(tmp.size() && tmp.back().F<=v[i].F && v[i].S<=tmp.back().S) continue;
		tmp.pb(v[i]);
	}
	v = tmp;
	tmp.clear();
	
	ll ans=0, L=v[0].F;
	forn(i,1,v.size())
	{
		if(v[i-1].S<v[i].F){
			ans+=v[i-1].S-L+1;
			L=v[i].F;
		}
	}
	ans+=v[v.size()-1].S-L+1;
	
	cout<<ans<<'\n';
	
	return 0;
}

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:10:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 #define forn(i,a,b) for(int i=(a);i<(b);i++)
                                    ^
strange_device.cpp:69:2: note: in expansion of macro 'forn'
  forn(i,0,v.size()){
  ^~~~
strange_device.cpp:10:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 #define forn(i,a,b) for(int i=(a);i<(b);i++)
                                    ^
strange_device.cpp:77:2: note: in expansion of macro 'forn'
  forn(i,1,v.size())
  ^~~~

• 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