Submission #1015692

#	Time	Username	Problem	Language	Result	Execution time	Memory
1015692		andrei_iorgulescu	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	36 / 100	1103 ms	96204 KiB

skyscraper

#include <bits/stdc++.h>

using namespace std;

int n,m;
int b[30005],p[30005];
map<pair<int,int>, bool> viz,luat;
map<pair<int,int>, int> d;
vector<int> what[30005];
int str,fin;

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];
    deque<pair<int,int>> q;
    q.push_back({str,0});
    viz[{str,0}] = true;
    while (!q.empty())
    {
        pair<int,int> nod = q.front();
        q.pop_front();
        if (luat[nod])
            continue;
        luat[nod] = true;
        int dist = d[nod];
        if (nod.second != 0)
        {
            pair<int,int> vec;
            vec = {nod.first,0};
            if (!viz[vec] or d[vec] > dist)
            {
                viz[vec] = true;
                q.push_front(vec);
                d[vec] = dist;
            }

            vec = {nod.first + nod.second,nod.second};
            if (!viz[vec] and vec.first >= 0 and vec.first < n)
            {
                viz[vec] = true;
                q.push_back(vec);
                d[vec] = dist + 1;
            }

            vec = {nod.first - nod.second,nod.second};
            if (!viz[vec] and vec.first >= 0 and vec.first < n)
            {
                viz[vec] = true;
                q.push_back(vec);
                d[vec] = dist + 1;
            }
        }
        else
        {
            for (auto it : what[nod.first])
            {
                pair<int,int> vec = {nod.first,it};
                if (!viz[vec] or d[vec] > dist)
                {
                    viz[vec] = true;
                    q.push_front(vec);
                    d[vec] = dist;
                }
            }
        }
    }
    if (!viz[{fin,0}])
        cout << -1;
    else
        cout << d[{fin,0}];
    return 0;
}

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