Submission #712949

#	Time	Username	Problem	Language	Result	Execution time	Memory
712949		inventiontime	Strange Device (APIO19_strange_device)	C++17	100 / 100	684 ms	49784 KiB

strange_device

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

#define int ll
#define endl '\n' //comment for interactive
#define fast_io ios::sync_with_stdio(0); cin.tie(0); cout.tie(0)

#define pb push_back
#define re resize
#define ff first
#define ss second

#define all(x) (x).begin(), (x).end()
#define loop(i, n) for(int i = 0; i < n; i++)
#define loop1(i, n) for(int i = 1; i <= n; i++)
#define print(x) cout << #x << ": " << x << endl << flush

typedef long long ll;
typedef vector<int> vi;
typedef array<int, 2> ii;
typedef array<int, 3> ti;
typedef vector<ii> vii;
typedef vector<ti> vti;
typedef priority_queue<int> pq;

template<class T> bool ckmin(T&a, T b) { bool B = a > b; a = min(a, b); return B; }
template<class T> bool ckmax(T&a, T b) { bool B = a < b; a = max(a, b); return B; }

const int inf = 1e17;
//const int maxn = ;

void solve() {

    int n, a, b;
    cin >> n >> a >> b;

    int p = 1.1e18;
    if((float) b * a / __gcd(a, b+1) < p) 
        p = b * a / __gcd(a, b+1);

    vii intvl;
    loop(i, n) {
        int l, r; cin >> l >> r;
        if(r - l + 1 >= p) intvl.pb({0, p-1});
        else {
            int x = l/p;
            l -= x*p;
            r -= x*p;
            if(r >= p) {
                intvl.pb({l, p-1});
                intvl.pb({0, r-p});
            } else {
                intvl.pb({l, r});
            }
        }
    }

    vii pts;
    for(auto [a, b] : intvl) {
        pts.pb({a, 1});
        pts.pb({b, 2});
    }
    sort(all(pts));

    int st = -1;
    int cnt = 0;
    int res = 0;
    for(auto [x, t] : pts) {
        if(t == 1) {
            if(cnt) cnt++;
            else {
                st = x;
                cnt++;
            }
        } else {
            cnt--;
            if(cnt) {}
            else
                res += x - st + 1;
        }
    }

    cout << res << endl;

}

signed main() {

    fast_io;

    int t = 1; //cin >> t;
    while(t--)
        solve();

    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