Submission #240507

#	Time	Username	Problem	Language	Result	Execution time	Memory
240507		valerikk	Strange Device (APIO19_strange_device)	C++14	100 / 100	827 ms	46528 KiB

strange_device

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

#define x first
#define y second
#define pb push_back
#define mp make_pair

#define all(a) (a).begin(), (a).end()
#define sz(a) (int)(a).size()

#define ll long long
#define ld long double
#define int long long

const int oo = 2e18 + 7;

bool ok(int a, int b) {
    return a <= oo / b;
}

int32_t main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n, a, b;
    cin >> n >> a >> b;
    int p = a / __gcd(a, b + 1);
    if (ok(p, b)) p *= b; else p = oo;
    vector<pair<int, int>> v;
    while (n--) {
        int l, r;
        cin >> l >> r;
        int L = l % p, R = r % p;
        if (r - l + 1 >= p) {
            L = 0;
            R = p - 1;
        }
        l = L;
        r = R;
        if (l <= r) {
            v.pb({l, 1});
            v.pb({r + 1, -1});
        } else {
            v.pb({0, 1});
            v.pb({r + 1, -1});
            v.pb({l, 1});
            v.pb({p, -1});
        }
    }
    sort(all(v));
    int ans = 0, bal = 0;
    for (int i = 0; i + 1 < sz(v); i++) {
        bal += v[i].y;
        if (bal) ans += v[i + 1].x - v[i].x;
    }
    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