Submission #1011953

#	Time	Username	Problem	Language	Result	Execution time	Memory
1011953		thinknoexit	Fish (IOI08_fish)	C++17	0 / 100	174 ms	19652 KiB

fish

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int N = 500500;
int MOD, n;
pair<int, int> a[N];
int tree[4 * N], cnt[N];
bool ch[N];
int mx[N];
void build(int now = 1, int l = 1, int r = n) {
    tree[now] = 1;
    if (l == r) return;
    int mid = (l + r) / 2;
    build(2 * now, l, mid), build(2 * now + 1, mid + 1, r);
}
void update(int v, int w, int now = 1, int l = 1, int r = n) {
    if (l == r) {
        tree[now] = (tree[now] + w + MOD) % MOD;
        return;
    }
    int mid = (l + r) / 2;
    if (v <= mid) update(v, w, 2 * now, l, mid);
    else update(v, w, 2 * now + 1, mid + 1, r);
    tree[now] = tree[2 * now] * tree[2 * now + 1] % MOD;
}
int query(int ql, int qr, int now = 1, int l = 1, int r = n) {
    if (ql > qr) return 1;
    if (l > qr || r < ql) return 1;
    if (ql <= l && r <= qr) return tree[now];
    int mid = (l + r) / 2;
    return query(ql, qr, 2 * now, l, mid) * query(ql, qr, 2 * now + 1, mid + 1, r) % MOD;
}
int main() {
    cin.tie(nullptr)->sync_with_stdio(false);
    int m;
    cin >> m >> n >> MOD;
    for (int i = 1;i <= m;i++) {
        cin >> a[i].first >> a[i].second;
        mx[a[i].second] = max(mx[a[i].second], a[i].first);
    }
    vector<pair<int, int>> v;
    for (int i = 1;i <= n;i++) {
        v.push_back({ mx[i], i });
    }
    sort(v.begin(), v.end());
    sort(a + 1, a + 1 + m);
    build();
    int ans = 0;
    int p = 0;
    for (int i = 1;i <= n;i++) {
        int l, t;
        tie(l, t) = v[i - 1];
        while (p < n && a[p + 1].first * 2 <= l) {
            p++;
            cnt[a[p].second]++;
            if (ch[a[p].second]) update(a[p].second, 1);
        }
        update(t, cnt[t]);
        ch[t] = 1;
        ans = (ans + tree[1]) % MOD;
    }
    cout << ans;
    return 0;
}

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