Submission #266429

#	Time	Username	Problem	Language	Result	Execution time	Memory
266429		define	Strange Device (APIO19_strange_device)	C++17	10 / 100	3365 ms	65084 KiB

strange_device

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define rep(i,n) for(int i=0;i<n;i++)
#define REP(i,n) for(int i=1;i<n;i++)
#define rev(i,n) for(int i=n-1;i>=0;i--)
#define all(v) v.begin(),v.end()
#define P pair<int,int>
#define len(s) (int)s.size()
 
template<class T> inline bool chmin(T &a, T b){
	if(a>b){a=b;return true;}
	return false;
}
template<class T> inline bool chmax(T &a, T b){
	if(a<b){a=b;return true;}
	return false;
}
constexpr int mod = 1e9+7;
constexpr long long inf = 3e18;

int gcd(int x,int y){
	return (y?gcd(y,x%y):x);
}
int A,B,N;
void solve1(){
	int ans=0;
	while(N--){
		int a,b;cin>>a>>b;
		ans+=b-a+1;
	}
	cout<<ans<<endl;
	exit(0);
}
signed main(){
	cin>>N>>A>>B;
	int x=(A%B+1)%A;
	int g=gcd(A,x);
	if(inf/(A/g)<B)solve1();
	int lc=A/g*B;
	set<P>st;
	rep(i,N){
		int a,b;cin>>a>>b;
		if(b-a+1>=lc){
			cout<<lc<<endl;return 0;
		}
		if(a/lc!=b/lc){
			st.insert({a%lc,lc-1});
			st.insert({0,b%lc});
		}else {
			st.insert({a%lc,b%lc});
		}
	}
	int ans=0,now=-1;
	for(P i:st){
		if(i.first<=now){
			ans+=max(0ll,i.second-now);
			chmax(now,i.second);
		}else {
			ans+=i.second-i.first+1;
			now=i.second;
		}
	}
	cout<<ans<<endl;
}

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