Submission #363856

#	Time	Username	Problem	Language	Result	Execution time	Memory
363856		Mahdi_Shokoufi	Strange Device (APIO19_strange_device)	C++17	100 / 100	732 ms	81004 KiB

strange_device

//In the name of Allah
#include <bits/stdc++.h>

using namespace std;

#define mp make_pair

typedef long long ll;

const ll inf = 1e18 + 10;

int main(){
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    ll n, a, b;
    cin >> n >> a >> b;
    ll p = (inf / b < a / __gcd(a, b + 1) ? inf : a / __gcd(a, b + 1) * b);
    set < pair < ll , ll > > st;
    for (int i = 0; i < n; i ++){
        ll l, r;
        cin >> l >> r;
        if (p <= r - l + 1)
            return cout << p, 0;
        l %= p; r %= p;
        if (l <= r)
            st.insert(mp(l, -r));
        else
            st.insert(mp(l, -p + 1)), st.insert(mp(0, -r));
    }
    ll ans = 0, mx = -1;
    for (auto itr = st.begin(); itr != st.end(); itr ++){
        ll x = itr -> first, y = -(itr -> second);
        ans += max(0LL, y - max(mx + 1, x) + 1);
        mx = max(mx, y);
    }
    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