Submission #559786

#	Time	Username	Problem	Language	Result	Execution time	Memory
559786		tranxuanbach	Strange Device (APIO19_strange_device)	C++17	100 / 100	867 ms	100184 KiB

strange_device

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;

#define endl '\n'
#define fi first
#define se second
#define For(i, l, r) for (auto i = (l); i < (r); i++)
#define ForE(i, l, r) for (auto i = (l); i <= (r); i++)
#define FordE(i, l, r) for (auto i = (l); i >= (r); i--)
#define Fora(v, a) for (auto v: (a))
#define bend(a) (a).begin(), (a).end()
#define isz(a) ((signed)(a).size())

using ll = long long;
using ld = long double;
using pii = pair <int, int>;
using vi = vector <int>;
using vpii = vector <pii>;
using vvi = vector <vi>;

const int N = 1e6 + 5;

int n; ll A, B;

ll ans;

signed main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    // freopen("KEK.inp", "r", stdin);
    // freopen("KEK.out", "w", stdout);
    cin >> n >> A >> B;
    __int128 G = (__int128)(A / __gcd(A, B + 1)) * B;
    if (G > (__int128)1e18){
        map <ll, ll> mpp;
        while (n--){
            ll l, r; cin >> l >> r;
            mpp[l]++; mpp[r + 1]--;
        }
        int cnt = 0; ll l = 0;
        Fora(elem, mpp){
            ll r = elem.fi;
            if (cnt != 0){
                ans += r - l;
            }
            cnt += elem.se;
            l = r;
        }
        cout << ans << endl;
        return 0;
    }
    ll g = G;
    map <ll, ll> mpp;
    while (n--){
        ll l, r; cin >> l >> r;
        if (r - l + 1 >= g){
            cout << g << endl;
            return 0;
        }
        l %= g; r %= g;
        if (l <= r){
            mpp[l]++; mpp[r + 1]--;
        }
        else{
            mpp[l]++; mpp[g]--; mpp[0]++; mpp[r + 1]--;
        }
    }

    int cnt = 0; ll l = 0;
    Fora(elem, mpp){
        ll r = elem.fi;
        if (cnt != 0){
            ans += r - l;
        }
        cnt += elem.se;
        l = r;
    }
    cout << ans << endl;
}

/*
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INPUT:                                            |
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OUTPUT:                                           |
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*/

• 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