Submission #729645

#	Time	Username	Problem	Language	Result	Execution time	Memory
729645		danikoynov	Strange Device (APIO19_strange_device)	C++14	0 / 100	5015 ms	524288 KiB

strange_device

#include<bits/stdc++.h>
#define endl '\n'

using namespace std;
typedef long long ll;

void speed()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
}

const int maxn = 1e6 + 10;

int n;
ll l[maxn], r[maxn];
ll A, B;


void solve()
{
    cin >> n >> A >> B;

    for (int i = 1; i <= n; i ++)
    {
        cin >> l[i] >> r[i];
    }
    ll g = __gcd(A, B + 1);
    /// period is A * B / g
    /**if ((double)(1e18) / (double)(A) < (double)(B) / (double)(g))
    {
        ll ans = 0;
        for (int i = 1; i <= n; i ++)
        {
            ans = ans + (r[i] - l[i] + 1);
        }
        cout << ans << endl;
        return;
    }*/

    double period = A * B / g;
    unordered_set < ll > st;
    for (int i = 1; i <= n; i ++)
    {

        for (ll j = l[i]; j <= r[i]; j ++)
        {
                 ll x = (j + (j / B)) % A, y = j % B;

                 ///cout << x << " " << y << endl;
            st.insert({x * B + A});
        }
    }

    cout << st.size() << endl;
}


int main()
{
    solve();
    return 0;
}
/**
1  10000 3312452154131231
1 1
*/

Compilation message (stderr)

strange_device.cpp: In function 'void solve()':
strange_device.cpp:49:44: warning: unused variable 'y' [-Wunused-variable]
   49 |                  ll x = (j + (j / B)) % A, y = j % B;
      |                                            ^
strange_device.cpp:42:12: warning: unused variable 'period' [-Wunused-variable]
   42 |     double period = A * B / g;
      |            ^~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 5
• Subtask 3: 0 / 5
• Subtask 4: 0 / 5
• Subtask 5: 0 / 5
• Subtask 6: 0 / 20
• Subtask 7: 0 / 20
• Subtask 8: 0 / 30