Submission #855427

#	Time	Username	Problem	Language	Result	Execution time	Memory
855427		MilosMilutinovic	Sequence (APIO23_sequence)	C++17	11 / 100	2061 ms	152668 KiB

sequence

#include "sequence.h"
#include <bits/stdc++.h>

#define pb push_back
#define fi first
#define se second
#define mp make_pair

using namespace std;

typedef long long ll;
typedef pair<int,int> pii;

int readint(){
    int x=0,f=1; char ch=getchar();
    while(ch<'0'||ch>'9'){if(ch=='-')f=-1;ch=getchar();}
    while(ch>='0'&&ch<='9'){x=x*10+ch-'0';ch=getchar();}
    return x*f;
}

const int N=5000500;

int n,a[N],val[N],pref[N];
vector<int> pos[N];

int sequence(int N,vector<int> A) {
    n=N; for(int i=1;i<=n;i++) a[i]=A[i-1];
    for(int i=1;i<=n;i++) pos[a[i]].pb(i);
    //build(1,1,n);
    for(int i=1;i<=n;i++) val[i]=1;
    int ans=0;
    for(int v=1;v<=n;v++){
        if(pos[v].empty()) continue;
        for(int j:pos[v]) val[j]=0;
//      for(int j:pos[v]) modify(1,1,n,j,n,-1);
        for(int i=1;i<=n;i++) pref[i]=pref[i-1]+val[i];
        for(int l=1;l<=n;l++){
            int cnt=0;
            for(int r=l;r<=n;r++){
                cnt+=(a[r]==v?1:0);
                if(abs(pref[r]-pref[l-1])<=cnt) ans=max(ans,cnt);
            }
        }
//      for(int j:pos[v]) modify(1,1,n,j,n,-1);
        for(int j:pos[v]) val[j]=-1;
    }
    return ans;
}

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