Submission #473612

#	Time	Username	Problem	Language	Result	Execution time	Memory
473612		OttoTheDino	Fish (IOI08_fish)	C++17	0 / 100	268 ms	24328 KiB

fish

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

#define rep(i,s,e)                  for (ll i = s; i <= e; ++i)
#define pb                          push_back
#define fi                          first
#define se                          second
#define all(a)                      a.begin(), a.end()
typedef long long ll;
typedef pair<ll, ll> ii;
typedef vector<ii> vii;

const ll mx = 5e5+5;

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);

    ll f, k, m, ans = 0; cin >> f >> k >> m;
    vii bois;
    rep (i,0,f-1) {
        ll l, tp; cin >> l >> tp;
        bois.pb({l, tp});
    }
    sort(all(bois));
    ll last[mx], cnt[mx] = {}, num[mx] = {}, done[mx] = {}, id = 0;
    rep (i,0,f-1) last[bois[i].se] = bois[i].fi;
    set<ll> st;

    rep (i,0,f-1) {
        ll l = bois[i].fi, tp = bois[i].se;

        while (l>=2*bois[id].fi) {
            ll c = ++cnt[bois[id].se];
            if (done[bois[id].se]) {
                if (--num[c-1]==0) st.erase(c-1);
                if (++num[c]==1) st.insert(c);
            }
            ++id;
        }

        if (last[tp]==l) {
            ll res = cnt[tp]+1;
            for (ll el : st) res = res*(el+1)%m*num[el]%m;
            ans = (ans+res)%m;
            done[tp] = 1;
            if (cnt[tp] && ++num[cnt[tp]]==1) st.insert(cnt[tp]);
        }
    }

    cout << ans << "\n";

    return 0;
}

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