Submission #404421

#	Time	Username	Problem	Language	Result	Execution time	Memory
404421		Lspeed	Triple Jump (JOI19_jumps)	C++14	19 / 100	3190 ms	115252 KiB

jumps

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

//Let's do sub case 2 first

struct segmentTree
{
    vector<int> val;

    segmentTree(int n)
    {
        for(int i=0;i<2*n;i++)
            val.push_back(0);
    }

    void update(int idx, int v)
    {
        idx = idx + (val.size())/2 - 1;
        val[idx] = v;
        idx /= 2;
        while(idx != 0)
        {
            val[idx] = max(val[2*idx],val[2*idx+1]);
            idx /= 2;
        }
    }

    int ans(int idx, int tl, int tr, int l, int r)
    {
        if(l > tr || r < tl)
            return 0;
        if(l <= tl && r >= tr)
            return val[idx];
        int can1 = ans(2*idx,tl,(tl+tr)/2,l,r);
        int can2 = ans(2*idx+1,(tl+tr)/2 +1,tr,l,r);
        //cout<<"ACCESS: "<<idx<<' '<<tl<<' '<<tr<<' '<<l<<' '<<r<<' '<<max(can1,can2)<<endl;
        return max(can1,can2);
    }
};

const int N = 8192;
int dp[N][N];
int v[N];
bool found[N][N];
segmentTree tree = segmentTree(N);

void DP(int l, int r)
{
    found[l-1][r-1] = true;
    if(r - l < 2)
        return;

    if(!found[l][r-1])
        DP(l+1,r);
    if(!found[l-1][r-2])
        DP(l,r-1);

    dp[l-1][r-1] = max(max(dp[l][r-1],dp[l-1][r-2]),v[l-1]+v[r-1]+tree.ans(1,1,8192,l+1,(l+r)/2));
}

int main()
{
    int n;
    cin>>n;
    if(n > N)
        return 0;
    for(int i=0;i<n;i++)
    {
        int a;
        cin>>a;
        tree.update(i+1,a);
        v[i] = a;
    }
    DP(1,n);
    int q;
    cin>>q;
    for(int i=0;i<q;i++)
    {
        int l,r;
        cin>>l>>r;
        if(!found[l-1][r-1])
            DP(l,r);
        cout<<dp[l-1][r-1]<<endl;
    }
    return 0;
}

• Subtask 1: 5 / 5
• Subtask 2: 14 / 14
• Subtask 3: 0 / 27
• Subtask 4: 0 / 54