Submission #369917

#	Time	Username	Problem	Language	Result	Execution time	Memory
369917		arnold518	Fish (IOI08_fish)	C++14	43 / 100	456 ms	65540 KiB

fish

#include <bits/stdc++.h>
using namespace std;
 
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
 
const int MAXN = 5e5;
const int MAXK = 7000;
 
int N, K;
ll MOD;
pii B[MAXN+10];
int C[MAXN+10];
 
int cnt[MAXN+10];
pii P[MAXN+10];
int I[MAXN+10];
 
int A[MAXK+10][MAXK+10];
ll dp2[MAXK+10][MAXK+10];
ll dp3[MAXK+10][MAXK+10];
 
ll dp[MAXK+10];
int V[MAXN+10];
 
int main()
{
	scanf("%d%d%lld", &N, &K, &MOD);
	for(int i=1; i<=N; i++) scanf("%d%d", &B[i].first, &B[i].second);
 
	sort(B+1, B+N+1);
	
	for(int i=1; i<=K; i++) P[i].second=i;
	for(int i=1; i<=N; i++)
	{
		P[B[i].second].first=B[i].first;
	}
 
	sort(P+1, P+K+1);
 
	for(int i=1; i<=K; i++) I[P[i].second]=i;
	for(int i=1; i<=N; i++) B[i].second=I[B[i].second];
	for(int i=1; i<=N; i++) C[B[i].second]=i;
 
	//for(int i=1; i<=N; i++) printf("%d %d\n", B[i].first, B[i].second);
 
	for(int i=1; i<=K; i++) V[i]=K+1;
	for(int i=1, j=1; i<=N; i++)
	{
		if(C[B[i].second]!=i) continue;
		for(; j<=N && B[j].first*2<=B[i].first; j++)
		{
			cnt[B[j].second]++;
			if(B[j].second<B[i].second && V[B[j].second]==K+1) V[B[j].second]=B[i].second;
		}
			for(int k=1; k<=K; k++) A[B[i].second][k]=cnt[k];
	}
 
	for(int i=1; i<=K; i++)
	{
		dp2[i][0]=dp3[i][0]=1;
		for(int j=1; j<=K; j++)
		{
			dp2[i][j]=dp2[i][j-1]*(A[i][j]+1)%MOD;
			
			if(i!=j) dp3[i][j]=dp3[i][j-1]*(A[i][j]+1)%MOD;
			else dp3[i][j]=dp3[i][j-1];
		}
	}
 
	for(int i=1; i<=K; i++)
	{
		dp[i]=dp[i-1];
		dp[i]+=dp2[i][i];
		dp[i]%=MOD;
 
		for(int j=1; j<i; j++)
		{
			if(A[j][j]!=A[i][j]) continue;
			dp[i]+=A[j][i]*dp3[j][i-1];
			dp[i]%=MOD;
		}
	}
	printf("%lld\n", dp[K]);
}

Compilation message (stderr)

fish.cpp: In function 'int main()':
fish.cpp:29:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   29 |  scanf("%d%d%lld", &N, &K, &MOD);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
fish.cpp:30:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   30 |  for(int i=1; i<=N; i++) scanf("%d%d", &B[i].first, &B[i].second);
      |                          ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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