Submission #763700

#	Time	Username	Problem	Language	Result	Execution time	Memory
763700		Kripton	Fish (IOI08_fish)	C++14	4 / 100	3063 ms	5760 KiB

fish

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

pair <int, int> v[500001];
int vf[500001], maxi[500001];
bitset <500001> checc;

int k, m;

int recalc()
{
    int rez = 1;
    for(int i = 1; i <= k; i++)
        if(!checc[i])
            rez = 1LL * rez * (vf[i] + 1) % m;
    return rez;
}

int recalc_fara(int j)
{
    int rez = 1;
    for(int i = 1; i <= k; i++)
        if(i != j)
            rez = 1LL * rez * (vf[i] + 1) % m;
    return rez;
}

int main()
{
#ifdef HOME
    freopen("test.in", "r", stdin);
    freopen("test.out", "w", stdout);
#endif // HOME
    int n;
    cin >> n >> k >> m;
    for(int i = 1; i <= n; i++)
        cin >> v[i].first >> v[i].second;
    sort(v + 1, v + n + 1);
    int j = 1;
    while(j <= n && 2 * v[j].first <= v[n].first)
        vf[v[j++].second]++;
    j--;
    for(int i = 1; i <= k; i++)
        maxi[i] = vf[i];
    int cate = 0;
    for(int i = n; i >= 1; i--)
    {
        while(j >= 1 && 2 * v[j].first > v[i].first)
            vf[v[j--].second]--;
        if(!checc[v[i].second])
        {
            if(vf[v[i].second] == maxi[v[i].second])
            {
                cate = (cate + recalc_fara(v[i].second)) % m;
                vf[v[i].second]--;
                cate = (cate + recalc()) % m;
                vf[v[i].second]++;
            }
            else
                cate = (cate + recalc()) % m;
            checc[v[i].second] = 1;
        }
    }
    cout << cate;
    return 0;
}

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