Submission #989559

#	Time	Username	Problem	Language	Result	Execution time	Memory
989559		huutuan	Fish (IOI08_fish)	C++14	0 / 100	3092 ms	11284 KiB

fish

#include<bits/stdc++.h>

using namespace std;

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

int calc_prod(){
   int prod=1;
   for (int k=1; k<=m; ++k) if (!vis[k]){
      prod=1ll*prod*(cnt[k]+1)%mod;
   }
   return prod;
}

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);
   int j=0;
   while (a[j+1].first*2<=a[n].first){
      ++j;
      ++cnt[a[j].second];
   }
   int ans=0;
   for (int i=n; i>=1; --i) if (!vis[a[i].second]){
      while (j && a[j].first*2>a[i].first){
         --cnt[a[j].second];
         --j;
      }
      ans=(ans+calc_prod())%mod;
      vis[a[i].second]=1;
   }
   cout << ans << '\n';
   return 0;
}

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