Submission #1217963

#	Time	Username	Problem	Language	Result	Execution time	Memory
1217963		veplsnx	Strange Device (APIO19_strange_device)	C++20	100 / 100	290 ms	16988 KiB

strange_device

#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define ld long double
#define u128 unsigned __int128
#define i128 __int128
#define len(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define pb push_back
#define eb emplace_back
#define mt make_tuple
#define mp make_pair
#define pii pair<int, int>
#define pll pair<ll, ll>
#define pli pair<ll, int>
#define pil pair<int, ll>
#define ff first
#define ss second

const ll inf = 9e18;
const int iinf = 2e9;
const int N = 1e5;
const ll MOD = 1e9 + 7;

void solution(){
    int n;
    ll a, b;
    cin >> n >> a >> b;
    a /= __gcd(a, b + 1);
    i128 T = (i128)b * a;
    vector<pair<ll, ll>> segs;
    for (int i = 0; i < n; ++i){
        ll l, r; cin >> l >> r;
        if (r - l + 1 >= T){
            segs.pb(mp(0, T - 1));
        } else{
            ll m_l = l % T, m_r = r % T;
            if (m_l <= m_r){
                segs.pb(mp(m_l, m_r));
            } else{
                segs.pb(mp(m_l, T - 1));
                segs.pb(mp(0, m_r));
            }
        }
    }
    sort(all(segs));
    ll l = segs[0].ff, r = segs[0].ss;
    ll ans = 0;
    for (int i = 1; i < len(segs); ++i){
        if (segs[i].ff > r){
            ans += (r - l + 1);
            l = segs[i].ff; r = segs[i].ss;
        } else{
            r = max(r, segs[i].ss);
        }
    }
    ans += r - l + 1;
    cout << ans;
}

signed main(/* Kurmankul Nurislam */){
    //freopen("fcolor.in", "r", stdin);
    //freopen("fcolor.out", "w", stdout);
    cin.tie(nullptr) -> sync_with_stdio(false);
    int t = 1;
    //cin >> t;
    while (t--){
        solution();
        //cout << '\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