Submission #316851

#	Time	Username	Problem	Language	Result	Execution time	Memory
316851		sofapuden	Strange Device (APIO19_strange_device)	C++14	100 / 100	766 ms	36932 KiB

strange_device

#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

int main(){
	ios_base::sync_with_stdio(0); cin.tie(0);
	ll n, a, b; cin >> n >> a >> b;
	ll mod = __gcd(a,b+1);
	ll ans = 0;
	if((a/mod) <= LONG_LONG_MAX/b)mod=(a/mod)*b;
	else mod = (ll)2e18;
	vector<array<ll,2>> inter;
	for(int i = 0; i < n; ++i){
		ll l, r; cin >> l >> r;
		if(r-l+1 >= mod){
			cout << mod << "\n";
			return 0;
		}
		l %= mod, r %= mod;
		if(l<=r)inter.push_back({l,0ll}), inter.push_back({r,1ll});
		else inter.push_back({l,0ll}), inter.push_back({0ll,0ll}), inter.push_back({mod-1,1ll}), inter.push_back({r,1ll});
	}
	sort(inter.begin(),inter.end());
	ll cn = 0;
	for(int i = 0; i < (int)inter.size(); ++i){
		if(inter[i][1] == 0){
			cn++;
			if(cn == 1){
				if(i)ans+=inter[i][0]-inter[i-1][0]-1ll;
				else ans+=inter[i][0];
			}
		}
		else cn--;	
	}
	ans = 1+inter[(inter.size()-1)][0]-ans;
	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