Submission #1016994

#	Time	Username	Problem	Language	Result	Execution time	Memory
1016994		huutuan	Fish (IOI08_fish)	C++14	4 / 100	35 ms	1200 KiB

fish

#include<bits/stdc++.h>

using namespace std;

const int N=7000+10;
int n, m, mod, mx[N], cnt[N], check[N], f[N];
vector<int> v[N];
pair<int, int> a[N];

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);
   for (int i=1; i<=n; ++i) mx[a[i].second]=i, ++cnt[a[i].second], f[a[i].second]=1;
   for (int i=1; i<=n; ++i) if (a[i].first*2<=a[mx[a[i].second]].first) ++f[a[i].second];
   int ans=0;
   for (int i=n, j=n; i>=1; --i) if (mx[a[i].second]==i){
      while (j && a[j].first*2>a[i].first){
         --cnt[a[j].second];
         --j;
      }
      {
         int cur=1;
         for (int k=1; k<=m; ++k){
            if (k==a[i].second){
               cur=cur*(cnt[k]+1-check[k])%mod;
            }else{
               if (mx[k]<=i) cur=cur*(cnt[k]+1)%mod;
            }
         }
         ans=(ans+cur)%mod;
      }
      if (check[a[i].second]){
         int cur=1;
         for (int k=1; k<=m; ++k) if (k!=a[i].second){
            cur=cur*(cnt[k]+1)%mod;
         }
         ans=(ans+cur)%mod;
      }
      {
         for (int k=1; k<=m; ++k){
            if (f[k]>cnt[k]) check[k]=1;
         }
      }
   }
   cout << ans << '\n';
   return 0;
}

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