Submission #1015729

#	Time	Username	Problem	Language	Result	Execution time	Memory
1015729		andrei_iorgulescu	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	57 / 100	3026 ms	262144 KiB

skyscraper

#include <bits/stdc++.h>

using namespace std;

int hsh(pair<int,int> pr)
{
    return pr.first * 31000 + pr.second;
}

int n,m;
int b[30005],p[30005];
unordered_map<int, bool> luat;
bitset<1000000000> viz;
unordered_map<int, int> d;
vector<int> what[30005];
int str,fin;
pair<int,int> q[2000005];

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    cin >> n >> m;
    for (int i = 1; i <= m; i++)
        cin >> b[i] >> p[i],what[b[i]].push_back(p[i]);
    str = b[1],fin = b[2];
    int bk = 1e6,fr = 1e6;
    q[bk] = {str,0};
    viz[hsh({str,0})] = 1;
    int cate = 0,lul = 1e6;
    while (bk <= fr)
    {
        pair<int,int> nod = q[fr];
        //cout << nod.first << ' ' << nod.second << endl;
        int dehnod = hsh(nod);
        fr--;
        if (luat[dehnod])
            continue;
        if (nod.first == fin and nod.second == 0)
            break;
        cate++;
        //if (cate > lul)
          //  assert(false);
        luat[dehnod] = true;
        int dist = d[dehnod];
        if (nod.second != 0)
        {
            pair<int,int> vec;
            vec = {nod.first,0};
            int dehvec = hsh(vec);
            if (!viz[dehvec] or d[dehvec] > dist)
            {
                viz[dehvec] = 1;
                q[++fr] = (vec);
                d[dehvec] = dist;
            }
            vec = {nod.first + nod.second,nod.second};
            dehvec = hsh(vec);
            if (vec.first >= 0 and vec.first < n and !viz[dehvec])
            {
                viz[dehvec] = 1;
                q[--bk] = vec;
                d[dehvec] = dist + 1;
            }
            vec = {nod.first - nod.second,nod.second};
            dehvec = hsh(vec);
            if (vec.first >= 0 and vec.first < n and !viz[dehvec])
            {
                viz[dehvec] = 1;
                q[--bk] = vec;
                d[dehvec] = dist + 1;
            }
        }
        else
        {
            for (auto it : what[nod.first])
            {
                pair<int,int> vec = {nod.first,it};
                int dehvec = hsh(vec);
                if (!viz[dehvec] or d[dehvec] > dist)
                {
                    viz[dehvec] = 1;
                    q[++fr] = vec;
                    d[dehvec] = dist;
                }
            }
        }
    }
    if (!viz[hsh({fin,0})])
        cout << -1;
    else
        cout << d[hsh({fin,0})];
    return 0;
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:31:18: warning: unused variable 'lul' [-Wunused-variable]
   31 |     int cate = 0,lul = 1e6;
      |                  ^~~

• Subtask 1: 10 / 10
• Subtask 2: 12 / 12
• Subtask 3: 14 / 14
• Subtask 4: 21 / 21
• Subtask 5: 0 / 43