Submission #674058

#	Time	Username	Problem	Language	Result	Execution time	Memory
674058		Kahou	Strange Device (APIO19_strange_device)	C++14	100 / 100	769 ms	96992 KiB

strange_device

/* In the name of God, aka Allah */
// let this be mytemp.cpp
#include<bits/stdc++.h>
using namespace std;
#define F first
#define S second
#define endl '\n'
#define mk make_pair
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const ll inf = (1ll<<60);
const int N = 1e6 + 50;
ll n, A, B;
pll P[N];
map<ll, ll> mp;

void solve() {
        cin >> n >> A >> B;
        ll C = B+1;
        ll lcm = A*min((inf+A-1)/A, C/__gcd(A, C));
        for (int i = 1; i <= n; i++) {
                cin >> P[i].F >> P[i].S;
                P[i].S ++;
                P[i].F += P[i].F/B;
                P[i].S += P[i].S/B;
                if (P[i].S - P[i].F >= lcm) {
                        return cout << lcm - lcm/C << endl, void();
                }
                ll l = P[i].F % lcm, r = P[i].S % lcm;
                mp[l]++;
                mp[r]--;
                if (r < l) mp[0]++, mp[lcm]--;
        }
        ll ans = 0;
        ll bl = 0;
        ll pt = 0;
        for (pll x:mp) {
                if (!bl) pt = x.F;
                bl += x.S;
                if (!bl) {
                        ans += (x.F-x.F/C)-(pt-pt/C);
                }
        }
        cout << ans << endl;
}
int main() {
        ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
        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