Submission #783793

#	Time	Username	Problem	Language	Result	Execution time	Memory
783793		devariaota	Strange Device (APIO19_strange_device)	C++17	100 / 100	726 ms	62944 KiB

strange_device

#include<bits/stdc++.h>
using namespace std;
#define ioss ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define int long long
#define pii pair<int, int>
#define fi first
#define se second
#define pb push_back
int n, a, b;
vector<pii> range;
bool comp(pii a, pii b) {
    return (a.fi < b.fi || (a.fi == b.fi && a.se < b.se));
}
signed main() {
    ioss;
    // cari cycle (bisa manual, baru cari pola)
    // --- a*b / fpb(a, b+1)
    // hitung segment aktif
    // line sweep
    cin >> n >> a >> b;
    __int128_t cycle = (__int128_t)a*b/(__gcd(a, (b+1)));
    int ans = 0;
    for(int i = 0; i < n; i++) {
        int l, r; cin >> l >> r;
        if((r-l)+1 >= cycle) ans = cycle;

        l %= cycle, r %= cycle;
        if(l <= r) range.pb({l, 1}), range.pb({r, 2});
        else range.pb({l, 1}), range.pb({cycle-1, 2}), range.pb({0, 1}), range.pb({r, 2});
    }
    sort(range.begin(), range.end(), comp);
    
    if(ans == cycle) {
        cout << ans << endl;
        return 0;
    }

    int l = -1, cnt = 0, r = 0;
    for(auto [val, type] : range) {
        if(type == 1) {
            if(l == -1) l = val;
            cnt++;
        }
        else r = val, cnt--;

        if(cnt == 0) ans += (r-l)+1, l = -1;
        // cout << " :: " << l << " " << r << " " << cnt << " " << ans << endl;
    }
    cout << ans << endl;
}

• 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