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답안 #615827

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
615827 2022-07-31T12:53:51 Z AbdelmagedNour 3단 점프 (JOI19_jumps) C++17
100 / 100
 812 ms 46560 KB 
#include<bits/stdc++.h>
using namespace std;
const int N=500005;
struct node{
    int res,f,mx;
    node(){res=f=mx=0;}
    node(int _res,int _f,int _mx){
        res=_res;
        f=_f;
        mx=_mx;
    }
};
struct SegTree{
    node tree[1<<20];
    int sz;
    node Merge(node&a,node&b){
        int res=max({a.res,b.res,a.f+b.mx}),f=max(a.f,b.f),mx=max(a.mx,b.mx);
        return node(res,f,mx);
    }
    void build(int l,int r,int p,vector<int>&a){
        if(l==r){
            tree[p].f=-1e9;
            tree[p].res=-1e9;
            tree[p].mx=0;
            if(l<a.size())tree[p].mx=a[l];
            return;
        }
        int md=(l+r)>>1;
        build(l,md,p*2+1,a);
        build(md+1,r,p*2+2,a);
        tree[p]=Merge(tree[p*2+1],tree[p*2+2]);
    }
    void init(int n,vector<int>&a){
        sz=1;
        while(sz<n)sz*=2;
        build(0,sz-1,0,a);
    }
    void update(int l,int r,int p,int idx,int f){
        if(l==r){
            tree[p].f=max(tree[p].f,f);
            tree[p].res=tree[p].f+tree[p].mx;
            return;
        }
        int md=(l+r)>>1;
        if(md>=idx)update(l,md,p*2+1,idx,f);
        else update(md+1,r,p*2+2,idx,f);
        tree[p]=Merge(tree[p*2+1],tree[p*2+2]);
    }
    void update(int idx,int f){
        update(0,sz-1,0,idx,f);
    }
    node query(int l,int r,int p,int l_q,int r_q){
        if(l>r_q||r<l_q)return node(0,0,0);
        if(l>=l_q&&r<=r_q)return tree[p];
        int md=(l+r)>>1;
        node ch1=query(l,md,p*2+1,l_q,r_q);
        node ch2=query(md+1,r,p*2+2,l_q,r_q);
        return Merge(ch1,ch2);
    }
    int query(int l,int r){
        return query(0,sz-1,0,l,r).res;
    }
}tree;
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n;
    cin>>n;
    vector<int>a(n);
    for(int i=0;i<n;i++)cin>>a[i];
    vector<pair<int,int>>seg;
    vector<int>st;// decreasing stack
    for(int i=0;i<n;i++){
        while(!st.empty()&&a[i]>=a[st.back()]){
            seg.push_back({st.back(),i});
            st.pop_back();
        }
        if(!st.empty())seg.push_back({st.back(),i});
        st.push_back(i);
    }
    sort(seg.begin(),seg.end());
    tree.init(n,a);
    int q;
    cin>>q;
    int L[q],R[q],sorted[q],ans[q];
    for(int i=0;i<q;i++){
        cin>>L[i]>>R[i];
        L[i]--;R[i]--;
        sorted[i]=i;
    }
    sort(sorted,sorted+q,[&](int i,int j){
            return L[i]>L[j];
         });
    for(int i=0;i<q;i++){
        while(!seg.empty()&&seg.back().first>=L[sorted[i]]){
            auto[l,r]=seg.back();
            if(2*r-l<n)tree.update(2*r-l,a[l]+a[r]);
            seg.pop_back();
        }
        ans[sorted[i]]=tree.query(L[sorted[i]],R[sorted[i]]);
    }
    for(int i=0;i<q;i++)cout<<ans[i]<<"\n";
    return 0;
}

Compilation message

jumps.cpp: In member function 'void SegTree::build(int, int, int, std::vector<int>&)':
jumps.cpp:25:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |             if(l<a.size())tree[p].mx=a[l];
      |                ~^~~~~~~~~

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 12628 KB Output is correct
2 Correct 6 ms 12636 KB Output is correct
3 Correct 7 ms 12628 KB Output is correct
4 Correct 8 ms 12516 KB Output is correct
5 Correct 8 ms 12568 KB Output is correct
6 Correct 7 ms 12632 KB Output is correct
7 Correct 6 ms 12628 KB Output is correct
8 Correct 6 ms 12628 KB Output is correct
9 Correct 6 ms 12628 KB Output is correct
10 Correct 8 ms 12628 KB Output is correct

Subtask #2
14.0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 12628 KB Output is correct
2 Correct 6 ms 12636 KB Output is correct
3 Correct 7 ms 12628 KB Output is correct
4 Correct 8 ms 12516 KB Output is correct
5 Correct 8 ms 12568 KB Output is correct
6 Correct 7 ms 12632 KB Output is correct
7 Correct 6 ms 12628 KB Output is correct
8 Correct 6 ms 12628 KB Output is correct
9 Correct 6 ms 12628 KB Output is correct
10 Correct 8 ms 12628 KB Output is correct
11 Correct 294 ms 26860 KB Output is correct
12 Correct 298 ms 26680 KB Output is correct
13 Correct 292 ms 26716 KB Output is correct
14 Correct 285 ms 26804 KB Output is correct
15 Correct 339 ms 26812 KB Output is correct
16 Correct 286 ms 26172 KB Output is correct
17 Correct 320 ms 26140 KB Output is correct
18 Correct 316 ms 26040 KB Output is correct
19 Correct 298 ms 26684 KB Output is correct

Subtask #3
27.0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Correct 110 ms 19268 KB Output is correct
2 Correct 59 ms 17328 KB Output is correct
3 Correct 73 ms 18500 KB Output is correct
4 Correct 114 ms 19288 KB Output is correct
5 Correct 110 ms 19280 KB Output is correct
6 Correct 106 ms 18652 KB Output is correct
7 Correct 109 ms 18636 KB Output is correct
8 Correct 122 ms 18628 KB Output is correct
9 Correct 110 ms 18896 KB Output is correct

Subtask #4
54.0 / 54.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 12628 KB Output is correct
2 Correct 6 ms 12636 KB Output is correct
3 Correct 7 ms 12628 KB Output is correct
4 Correct 8 ms 12516 KB Output is correct
5 Correct 8 ms 12568 KB Output is correct
6 Correct 7 ms 12632 KB Output is correct
7 Correct 6 ms 12628 KB Output is correct
8 Correct 6 ms 12628 KB Output is correct
9 Correct 6 ms 12628 KB Output is correct
10 Correct 8 ms 12628 KB Output is correct
11 Correct 294 ms 26860 KB Output is correct
12 Correct 298 ms 26680 KB Output is correct
13 Correct 292 ms 26716 KB Output is correct
14 Correct 285 ms 26804 KB Output is correct
15 Correct 339 ms 26812 KB Output is correct
16 Correct 286 ms 26172 KB Output is correct
17 Correct 320 ms 26140 KB Output is correct
18 Correct 316 ms 26040 KB Output is correct
19 Correct 298 ms 26684 KB Output is correct
20 Correct 110 ms 19268 KB Output is correct
21 Correct 59 ms 17328 KB Output is correct
22 Correct 73 ms 18500 KB Output is correct
23 Correct 114 ms 19288 KB Output is correct
24 Correct 110 ms 19280 KB Output is correct
25 Correct 106 ms 18652 KB Output is correct
26 Correct 109 ms 18636 KB Output is correct
27 Correct 122 ms 18628 KB Output is correct
28 Correct 110 ms 18896 KB Output is correct
29 Correct 812 ms 46336 KB Output is correct
30 Correct 607 ms 42408 KB Output is correct
31 Correct 641 ms 46300 KB Output is correct
32 Correct 715 ms 46336 KB Output is correct
33 Correct 758 ms 46476 KB Output is correct
34 Correct 722 ms 44084 KB Output is correct
35 Correct 737 ms 43684 KB Output is correct
36 Correct 751 ms 43828 KB Output is correct
37 Correct 729 ms 45196 KB Output is correct
38 Correct 588 ms 46332 KB Output is correct
39 Correct 562 ms 46332 KB Output is correct
40 Correct 595 ms 42960 KB Output is correct
41 Correct 569 ms 42488 KB Output is correct
42 Correct 642 ms 42464 KB Output is correct
43 Correct 602 ms 44248 KB Output is correct
44 Correct 593 ms 46356 KB Output is correct
45 Correct 631 ms 46368 KB Output is correct
46 Correct 603 ms 43184 KB Output is correct
47 Correct 569 ms 42800 KB Output is correct
48 Correct 560 ms 42828 KB Output is correct
49 Correct 579 ms 44772 KB Output is correct
50 Correct 604 ms 46344 KB Output is correct
51 Correct 666 ms 46560 KB Output is correct
52 Correct 606 ms 43868 KB Output is correct
53 Correct 605 ms 43612 KB Output is correct
54 Correct 593 ms 43692 KB Output is correct
55 Correct 618 ms 45212 KB Output is correct