Submission #721503

#	Time	Username	Problem	Language	Result	Execution time	Memory
721503		GrandTiger1729	Strange Device (APIO19_strange_device)	C++17	10 / 100	5044 ms	524288 KiB

strange_device

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

const int INF = 1e18 + 10;
int main(){
    cin.tie(0)->sync_with_stdio(0);
    int n; cin >> n;
    long long A, B; cin >> A >> B;
    if ((__int128_t)1 * A * B / __gcd(A, B + 1) >= INF){
        long long ans = 0;
        for (int i = 0; i < n; i++){
            long long l, r; cin >> l >> r;
            ans += r - l + 1;
        }
        cout << ans << '\n';
        return 0;
    }
    long long D = (__int128_t)1 * A * B / __gcd(A, B + 1);
    set<long long> st;
    for (int i = 0; i < n; i++){
        long long l, r; cin >> l >> r;
        for (long long j = l; j <= r; j++)
            st.insert(j % D);
    }
    // cerr << D << '\n';
    // for (auto &v: st)
    //     cerr << v << ' ';
    // cerr << endl;
    cout << st.size() << '\n';
    return 0;
}

Compilation message (stderr)

strange_device.cpp:4:22: warning: overflow in conversion from 'double' to 'int' changes value from '1.0e+18' to '2147483647' [-Woverflow]
    4 | const int INF = 1e18 + 10;
      |                 ~~~~~^~~~

• Subtask 1: 10 / 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