Submission #558843

#	Time	Username	Problem	Language	Result	Execution time	Memory
558843		myrcella	Strange Device (APIO19_strange_device)	C++17	100 / 100	530 ms	48652 KiB

strange_device

//by szh
#include<bits/stdc++.h>
using namespace std;

#define fi first
#define se second
#define pii pair<int,int>
#define pll pair<long long,long long>
#define pb push_back
#define debug(x) cerr<<#x<<"="<<x<<endl
#define pq priority_queue
#define inf 0x3f
#define rep(i,a,b) for (int i=a;i<(b);i++)
#define MP make_pair
#define SZ(x) (int(x.size()))
#define ll long long
#define ALL(x) x.begin(),x.end()

const ll big = 1000000000000000000;
ll mod;

int n;
ll a,b;
vector <pll> range;

int main() {
	
//	freopen("input.txt","r",stdin);	
	std::ios::sync_with_stdio(false);cin.tie();
	cin>>n>>a>>b;
	ll tmp = __gcd(a,b+1);
	tmp = a/tmp;
	if (1.0*big/tmp<(double)b) mod = big;
	else mod = b*tmp;
	debug(mod);
	rep(i,0,n) {
		ll l,r;cin>>l>>r;
		if (l/mod==r/mod) range.pb({l%mod,r%mod});
		else range.pb({l%mod,mod-1}),range.pb({0,r%mod});
	}
	sort(ALL(range));
	ll cur = -1,ans=0;
	for (auto x:range) {
		if (x.fi<=cur) ans+=max(0ll,x.se-cur),cur = max(cur,x.se);
		else ans+=x.se-x.fi+1,cur = x.se;
	}
	cout<<ans;
	return 0;
}

• 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