Submission #1261869

#	Time	Username	Problem	Language	Result	Execution time	Memory
1261869		wedonttalkanymore	Strange Device (APIO19_strange_device)	C++20	35 / 100	606 ms	63080 KiB

strange_device

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

#define int long long
#define pii pair<ll, ll>
#define fi first
#define se second

const ll N = 2e5 + 5, inf = 1e18, mod = 1e9 + 7, block = 320, lim = 16;

int n, A, B;
map <int, int> mp;

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    if (fopen(".inp", "r")) {
        freopen(".inp", "r", stdin);
        freopen(".out", "w", stdout);
    }
    cin >> n >> A >> B;
    int t = __gcd(A, B + 1);
    int x = A / t;
    int L = min((ll)1e18, x * B); // chu ki
    mp[0] = mp[L] = 0;
    for (int i = 1; i <= n; i++) {
        int l, r;
        cin >> l >> r;
        if (L <= r - l + 1) {
            cout << L;
            // cout << 1;
            return 0;
        }
        mp[l % L]++, mp[r % L + 1]--;
        if (l % L > r % L) mp[0]++, mp[L]--;
    }
    int ans = 0, last = 0, sum = 0;
    for (auto [id, val] : mp) {
        if (sum) {
            ans += id - last;
        }
        sum += val;
        last = id;
    }
    cout << ans;
    return 0;
}

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:19:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |         freopen(".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~
strange_device.cpp:20:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |         freopen(".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~

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