Submission #678146

#	Time	Username	Problem	Language	Result	Execution time	Memory
678146		faribourz	Strange Device (APIO19_strange_device)	C++14	100 / 100	779 ms	67948 KiB

strange_device

// Only GOD
// believe in yourself
// Nemidam Del Be In Darde Donya!
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;

#define F first
#define S second
#define pb push_back
#define all(x) x.begin(), x.end()
#define bit(x, y) ((x >> y)&1)
#define sz(x) (int)x.size()
#define kill(x) return cout << x << '\n', void()
#define KILL(x) return cout << x << '\n', 0
#define int ll

const int INF = 1e18;
map<int, int> M;
int32_t main(){
	ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	int A, B, n;
	cin >> n >> A >> B;
	int g = __gcd(A, B+1);
	int AB;
	A /= g;
	if(INF / A < B+1){
		AB = INF;
	}
	else
		AB = A*B;
	int ans = 0;
	for(int i = 0; i < n; i++){
		int l, r;
		cin >> l >> r;
		if(r-l+1 >= AB)
			ans = AB;
		l %= AB, r %= AB;
		if(!r){
			M[0]++;
			M[1]--;
			if(l)
				M[l]++, M[AB]--;
			continue;
		}
		if(l <= r){
			M[l]++;
			M[r+1]--;
		}
		else{
			M[0]++;
			M[l]++;
			M[AB]--;
			M[r+1]--;
		}
	}
	if(ans)
		KILL(ans);
	int sum = 0, lst = -1;
	ans = 0;
	for(auto x : M){
		if(lst == -1){
			sum += x.S;
			lst = x.F;
			continue;
		}
		if(sum > 0){
			ans += x.F-lst;
		}
		sum += x.S;
		lst = x.F;
	}
	cout << min(ans, AB);
}

• 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