Submission #989577

#	Time	Username	Problem	Language	Result	Execution time	Memory
989577		huutuan	Fish (IOI08_fish)	C++14	4 / 100	3063 ms	65536 KiB

fish

#include<bits/stdc++.h>

using namespace std;

const int N=5e5+10;
int n, m, mod;
pair<int, int> a[N];

int solve(vector<pair<int, int>> v){
   if (v.empty()) return 0;
   int z=v.back().second;
   vector<int> cnt(m+1), cnt2(m+1);
   for (auto &i:v) if (i.first*2<=v.back().first) ++cnt[i.second];
   int ans=accumulate(cnt.begin(), cnt.end(), 1ll, [&](int x, int y){ return x*(y+1)%mod; });
   for (int i=0, j=-1; i<(int)v.size(); ++i){
      while (v[j+1].first*2<=v[i].first){
         ++j;
         ++cnt2[v[j].second];
      }
      if (v[i].second!=z && cnt2[v[i].second]>=cnt[v[i].second]){
         int prod=1;
         for (int k=1; k<=m; ++k) if (k!=v[i].second) prod=prod*(cnt2[k]+1-(k==z))%mod;
         ans=(ans+prod)%mod;
      }
   }
   vector<pair<int, int>> v2;
   for (auto &i:v) if (i.second!=z) v2.push_back(i);
   return (ans+solve(v2))%mod;
}

int32_t main(){
   ios_base::sync_with_stdio(false);
   cin.tie(nullptr);
   cin >> n >> m >> mod;
   for (int i=1; i<=n; ++i) cin >> a[i].first >> a[i].second;
   sort(a+1, a+n+1);
   cout << solve(vector<pair<int, int>>(a+1, a+n+1)) << '\n';
   return 0;
}

• Subtask 1: 4 / 4
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• Subtask 19: 0 / 5