Submission #404578

#	Time	Username	Problem	Language	Result	Execution time	Memory
404578		Lspeed	Triple Jump (JOI19_jumps)	C++14	27 / 100	3338 ms	8096 KiB

jumps

#include<bits/stdc++.h>
using namespace std;
using pii = pair<int,int>;

//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 l, int r)
    {
        return ans(1,1,(val.size())/2,l+1,r+1);
    }

    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 = 262144;
segmentTree tree = segmentTree(N);
int dp = 0;
int v[N];

int main()
{
    int n;
    scanf("%d",&n);
    if(n > N)
        return 0;
    for(int i=0;i<n;i++)
    {
        int a;
        scanf("%d",&a);
        tree.update(i+1,a);
        v[i] = a;
    }
    priority_queue<pii> pq; //{val,pos}
    for(int i=0;i<n;i++)
    {
        queue<pii> qu;
        for(int j=0;j<min(30,i);j++)
        {
            pii cur = pq.top();
            pq.pop();
            qu.push(cur);
            int beg = max(2*cur.second - i,0);
            dp = max(dp,v[i]+v[cur.second]+max(tree.ans(beg,cur.second-1),tree.ans(cur.second+1,(cur.second+i)/2)));
        }
        while(!qu.empty())
        {
            pii cur = qu.front();
            qu.pop();
            pq.push(cur);
        }
        pq.push({v[i],i});
        //cout<<"POS: "<<i<<' '<<dp<<endl;
    }
    int q;
    scanf("%d",&q);
    for(int i=0;i<q;i++)
    {
        int l,r;
        scanf("%d%d",&l,&r);
        printf("%d\n",dp);
    }
    return 0;
}

Compilation message (stderr)

jumps.cpp: In function 'int main()':
jumps.cpp:55:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   55 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
jumps.cpp:61:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   61 |         scanf("%d",&a);
      |         ~~~~~^~~~~~~~~
jumps.cpp:87:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   87 |     scanf("%d",&q);
      |     ~~~~~^~~~~~~~~
jumps.cpp:91:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   91 |         scanf("%d%d",&l,&r);
      |         ~~~~~^~~~~~~~~~~~~~

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