Submission #335116

#	Time	Username	Problem	Language	Result	Execution time	Memory
335116		CSQ31	Strange Device (APIO19_strange_device)	C++14	100 / 100	1546 ms	53748 KiB

strange_device

#pragma GCC optimize("Ofast") 
#include<bits/stdc++.h>
using namespace std;
#define pb push_back
#define fi first
#define se second
#define mp make_pair
#define all(a) a.begin(),a.end()
#define sz(a) (int)(a.size())
#define lb lower_bound
#define ub upper_bound
#define owo ios_base::sync_with_stdio(0);cin.tie(0);
#define MOD (ll)(1e9+7)
#define INF (ll)(1e18)
#define debug(...) fprintf(stderr, __VA_ARGS__),fflush(stderr)
#define time__(d) for(long blockTime = 0; (blockTime == 0 ? (blockTime=clock()) != 0 : false);\
debug("%s time : %.4fs\n", d, (double)(clock() - blockTime) / CLOCKS_PER_SEC))
typedef long long int ll;
typedef long double ld;
typedef pair<ll,ll> PII;
typedef pair<int,int> pii;
typedef vector<vector<int>> vii;
typedef vector<vector<ll>> VII;
ll gcd(ll A,ll B) {if(!B)return A;return gcd(B,A%B);}
int main()
{
	ll n,a,b;
	cin>>n>>a>>b;
	ll C = a/gcd(a,b+1) > INF/b?INF+1:(a/gcd(a,b+1))*b;
   // cout<<C<<'\n';
	vector<PII>s;
	for(int i=0;i<n;i++){
		ll l,r;
		cin>>l>>r;
		if(r-l+1 > C){cout<<C;return 0;}
		l%=C;
		r%=C;
		if(r >= l){
			s.pb({l,r});
		}else{
			s.pb({l,C-1});
			s.pb({0,r});
		}
	}
	sort(all(s));
	ll ans = 0;
	ll lf = 0;
	ll rg = -1;
	for(int i=0;i<sz(s);i++){
		//cout<<s[i].fi<<" "<<s[i].se<<'\n';
		if(s[i].fi > rg){
			ans+=rg-lf+1;
			lf = s[i].fi;
			rg = s[i].se;
			if(i == sz(s)-1)ans+=rg-lf+1;
		}else{
			rg = max(rg,s[i].se);
			if(i == sz(s)-1)ans+=rg-lf+1;
		}
		//cout<<ans<<'\n';
	}
	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