Submission #776539

#	Time	Username	Problem	Language	Result	Execution time	Memory
776539		jamezzz	Fish (IOI08_fish)	C++17	0 / 100	207 ms	65536 KiB

fish

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

#define sf scanf
#define pf printf
#define fi first
#define se second
#define pb push_back
#define sz(x) ((int)x.size())
#define all(x) x.begin(),x.end()
#define LINF 1023456789123456789
typedef long long ll;
typedef pair<int,int> ii;
typedef pair<ll,int> li;

#define maxn 500005
#define maxk 7005

int n,k,m,cnt[maxk],bad[maxk],num[maxk][maxk];
ll mn[maxn];
vector<ii> v;

int main(){
  sf("%d%d%d",&n,&k,&m);
  assert(n<=500000&&k<=7000);
  for(int i=0;i<n;++i){
    int l,c;
    sf("%d%d",&l,&c);
    v.pb({l,c});
    ++cnt[c];
  }
  sort(all(v));
  int ptr=n-1;
  ll ans=0;
  fill(mn,mn+n+1,1);
  for(int i=n-1;i>=0;--i){
    int c=v[i].se;
    if(bad[c])continue;
    while(ptr>=0&&v[i].fi<2*v[ptr].fi){
      --cnt[v[ptr].se];
      --ptr;
    }
    vector<int> undo;
    for(int j=1;j<=k;++j){
      if(v[i].se==j)continue;
      int x=num[c][j];
      if(x==cnt[c]+1){
        mn[x+1]*=(cnt[j]+1);
        mn[x+1]%=m;
        undo.pb(x+1);
      }
    }
    ll add=1;
    for(int j=1;j<=cnt[c]+1;++j){
      add*=mn[j];
      add%=m;
      ans+=add;
      ans%=m;
    }
    for(int x:undo)mn[x]=1;
    for(int j=1;j<=k;++j){
      num[j][c]=cnt[j];
    }
    bad[c]=1;
  }
  pf("%lld\n",ans);
}

Compilation message (stderr)

fish.cpp: In function 'int main()':
fish.cpp:24:5: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |   sf("%d%d%d",&n,&k,&m);
      |     ^
fish.cpp:28:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |     sf("%d%d",&l,&c);
      |       ^

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