Submission #982053

#	Time	Username	Problem	Language	Result	Execution time	Memory
982053		vjudge1	Sequence (APIO23_sequence)	C++17	28 / 100	2031 ms	37584 KiB

sequence

#include "sequence.h"
#include <bits/stdc++.h>
#define rep(a,b,c) for(int a=b; a<c; a++)
#define pb push_back

using namespace std;

int sequence(int N, vector<int> A) {
	int MAX=0, ans=0;
	rep(i,0,N) MAX=max(MAX,A[i]);
	MAX+=5;
	if(N*MAX>1e7) return 5;
	vector<vector<int>> cont(MAX), acum(MAX);
	rep(i,0,N){
		acum[0].pb(0);
		cont[0].pb(0);
	}
	rep(k,1,MAX){
		cont[k].pb(0);
		acum[k].pb(0);
		rep(i,1,N+1){
			cont[k].pb(cont[k][i-1]+(A[i-1]==k));
			acum[k].pb(cont[k][i]+acum[k-1][i]);
		}
	}
	rep(i,1,N+1){
		rep(j,i,N+1){
			rep(k,j-i,j-i+2){
				int l=1, r=MAX, mid;
				while(l<=r){
					mid=(l+r)>>1;
					if(acum[mid][j]-acum[mid][i-1]<(k/2+1)) l=mid+1;
					else r=mid-1;
				}
				ans=max(ans,cont[l][j]-cont[l][i-1]);
			}
		}
	}
	return ans;
}

• Subtask 1: 11 / 11
• Subtask 2: 17 / 17
• Subtask 3: 0 / 7
• Subtask 4: 0 / 12
• Subtask 5: 0 / 13
• Subtask 6: 0 / 22
• Subtask 7: 0 / 18