oj.uz

답안 #219549

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
219549 2020-04-05T14:15:17 Z MKopchev 3단 점프 (JOI19_jumps) C++14
100 / 100
 1743 ms 46676 KB 
#include<bits/stdc++.h>
using namespace std;
const int nmax=(1<<19)+42,MX=20;
int n,q;

int inp[nmax];

vector< pair<int,int> > start;

struct info
{
    int best_sum;
    int mx_first;
    int mx_second;
};
info tree[2*nmax];

info my_merge(info l,info r)
{
    info ret;

    ret.mx_first=max(l.mx_first,r.mx_first);
    ret.mx_second=max(l.mx_second,r.mx_second);

    ret.best_sum=max(l.best_sum,r.best_sum);
    ret.best_sum=max(ret.best_sum,l.mx_first+r.mx_second);
    return ret;
}
void update(int node,int l,int r,int pos,pair<int,int> val)
{
    if(l==r)
    {
        tree[node].mx_first=max(tree[node].mx_first,val.first);
        tree[node].mx_second=val.second;
        tree[node].best_sum=tree[node].mx_first+tree[node].mx_second;
        return;
    }

    int av=(l+r)/2;
    if(pos<=av)update(node*2,l,av,pos,val);
    else update(node*2+1,av+1,r,pos,val);

    tree[node]=my_merge(tree[node*2],tree[node*2+1]);
}

info query(int node,int l,int r,int lq,int rq)
{
    if(l==lq&&r==rq)return tree[node];
    int av=(l+r)/2;

    info ret;ret.best_sum=0;ret.mx_first=0;ret.mx_second=0;

    if(lq<=av)ret=my_merge(ret,query(node*2,l,av,lq,min(av,rq)));
    if(av<rq)ret=my_merge(ret,query(node*2+1,av+1,r,max(av+1,lq),rq));
    return ret;
}

stack<int> active;

struct que
{
    int l,r,id;
};
que help[nmax];
bool cmp(que a,que b)
{
    return a.l>b.l;
}

int output[nmax];
int main()
{
    scanf("%i",&n);
    for(int i=1;i<=n;i++)scanf("%i",&inp[i]);

    for(int i=1;i<=n;i++)
    update(1,1,n,i,{0,inp[i]});

    for(int i=1;i<=n;i++)
    {

        while(active.size()&&inp[active.top()]<=inp[i])
        {
            start.push_back({active.top(),i});
            active.pop();
        }

        if(active.size())start.push_back({active.top(),i});

        active.push(i);
    }
    sort(start.begin(),start.end());

    reverse(start.begin(),start.end());
    /*
    cout<<"start: "<<endl;
    for(auto k:start)cout<<k.first<<" "<<k.second<<endl;
    */
    scanf("%i",&q);
    for(int i=1;i<=q;i++)
    {
        scanf("%i%i",&help[i].l,&help[i].r);
        help[i].id=i;
    }
    sort(help+1,help+q+1,cmp);

    int pointer_start=0;

    int pointer_help=1;

    for(int l=n;l>=1;l--)
    {
        //cout<<"l= "<<l<<" "<<start[pointer_start].first<<" "<<pointer_start<<" "<<pointer_help<<endl;

        while(pointer_start<start.size()&&start[pointer_start].first==l)
        {
            int a=start[pointer_start].first;
            int b=start[pointer_start].second;
            int c=b+b-a;

            //cout<<"a= "<<a<<" b= "<<b<<" c= "<<c<<endl;

            if(c<=n)
            {
                update(1,1,n,c,{inp[a]+inp[b],inp[c]});

                //cout<<"update "<<c<<" "<<inp[a]+inp[b]<<" with "<<inp[c]<<endl;
            }

            pointer_start++;
        }

        while(pointer_help<=q&&help[pointer_help].l==l)
        {
            output[help[pointer_help].id]=query(1,1,n,help[pointer_help].l,help[pointer_help].r).best_sum;
            pointer_help++;
        }
    }
    for(int i=1;i<=q;i++)
        printf("%i\n",output[i]);
    return 0;
}

Compilation message

jumps.cpp: In function 'int main()':
jumps.cpp:115:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         while(pointer_start<start.size()&&start[pointer_start].first==l)
               ~~~~~~~~~~~~~^~~~~~~~~~~~~
jumps.cpp:73:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%i",&n);
     ~~~~~^~~~~~~~~
jumps.cpp:74:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for(int i=1;i<=n;i++)scanf("%i",&inp[i]);
                          ~~~~~^~~~~~~~~~~~~~
jumps.cpp:99:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%i",&q);
     ~~~~~^~~~~~~~~
jumps.cpp:102:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%i%i",&help[i].l,&help[i].r);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 5 ms 384 KB Output is correct

Subtask #2
14.0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 5 ms 384 KB Output is correct
11 Correct 655 ms 18372 KB Output is correct
12 Correct 660 ms 18124 KB Output is correct
13 Correct 661 ms 18124 KB Output is correct
14 Correct 665 ms 18296 KB Output is correct
15 Correct 661 ms 18296 KB Output is correct
16 Correct 645 ms 17648 KB Output is correct
17 Correct 660 ms 17656 KB Output is correct
18 Correct 644 ms 17648 KB Output is correct
19 Correct 652 ms 18280 KB Output is correct

Subtask #3
27.0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Correct 277 ms 13264 KB Output is correct
2 Correct 183 ms 11248 KB Output is correct
3 Correct 182 ms 11604 KB Output is correct
4 Correct 275 ms 13288 KB Output is correct
5 Correct 273 ms 13288 KB Output is correct
6 Correct 269 ms 12648 KB Output is correct
7 Correct 266 ms 12496 KB Output is correct
8 Correct 263 ms 12496 KB Output is correct
9 Correct 275 ms 12776 KB Output is correct

Subtask #4
54.0 / 54.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 5 ms 384 KB Output is correct
11 Correct 655 ms 18372 KB Output is correct
12 Correct 660 ms 18124 KB Output is correct
13 Correct 661 ms 18124 KB Output is correct
14 Correct 665 ms 18296 KB Output is correct
15 Correct 661 ms 18296 KB Output is correct
16 Correct 645 ms 17648 KB Output is correct
17 Correct 660 ms 17656 KB Output is correct
18 Correct 644 ms 17648 KB Output is correct
19 Correct 652 ms 18280 KB Output is correct
20 Correct 277 ms 13264 KB Output is correct
21 Correct 183 ms 11248 KB Output is correct
22 Correct 182 ms 11604 KB Output is correct
23 Correct 275 ms 13288 KB Output is correct
24 Correct 273 ms 13288 KB Output is correct
25 Correct 269 ms 12648 KB Output is correct
26 Correct 266 ms 12496 KB Output is correct
27 Correct 263 ms 12496 KB Output is correct
28 Correct 275 ms 12776 KB Output is correct
29 Correct 1743 ms 46440 KB Output is correct
30 Correct 1528 ms 42392 KB Output is correct
31 Correct 1529 ms 44332 KB Output is correct
32 Correct 1730 ms 46412 KB Output is correct
33 Correct 1684 ms 46464 KB Output is correct
34 Correct 1670 ms 44152 KB Output is correct
35 Correct 1659 ms 43772 KB Output is correct
36 Correct 1672 ms 43856 KB Output is correct
37 Correct 1652 ms 45264 KB Output is correct
38 Correct 1440 ms 46564 KB Output is correct
39 Correct 1447 ms 46544 KB Output is correct
40 Correct 1418 ms 43052 KB Output is correct
41 Correct 1393 ms 42576 KB Output is correct
42 Correct 1401 ms 42832 KB Output is correct
43 Correct 1434 ms 44436 KB Output is correct
44 Correct 1535 ms 46532 KB Output is correct
45 Correct 1492 ms 46676 KB Output is correct
46 Correct 1486 ms 43348 KB Output is correct
47 Correct 1488 ms 43004 KB Output is correct
48 Correct 1494 ms 43088 KB Output is correct
49 Correct 1499 ms 45040 KB Output is correct
50 Correct 1559 ms 46544 KB Output is correct
51 Correct 1569 ms 46544 KB Output is correct
52 Correct 1548 ms 44112 KB Output is correct
53 Correct 1548 ms 43856 KB Output is correct
54 Correct 1544 ms 43784 KB Output is correct
55 Correct 1594 ms 45524 KB Output is correct