Submission #857635

#	Time	Username	Problem	Language	Result	Execution time	Memory
857635		12345678	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	36 / 100	15 ms	16472 KiB

skyscraper

#include <bits/stdc++.h>

using namespace std;

const int nx=2e3+5;

int n, m, st, ed, jp, b, p[nx], dp[nx][nx];
vector<int> v[nx];
priority_queue<tuple<int, int, int>, vector<tuple<int, int, int>>, greater<tuple<int, int, int>>> q;

int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n>>m>>st>>p[0]>>ed>>p[1]; v[ed].push_back(1);
    for (int i=1; i<m-1; i++) cin>>b>>p[i+1], v[b].push_back(i+1);
    for (int i=0; i<nx; i++) for (int j=0; j<nx; j++) dp[i][j]=INT_MAX;
    dp[p[0]][st]=0;
    q.push({0, p[0], st});
    while (!q.empty())
    {
        auto [w, c, l]=q.top();
        //cout<<c<<' '<<w<<' '<<l<<'\n';
        q.pop();
        if (l+c<n&&w+1<dp[c][l+c]) dp[c][l+c]=w+1, q.push({w+1, c, l+c});
        if (l-c>=0&&w+1<dp[c][l-c]) dp[c][l-c]=w+1, q.push({w+1, c, l-c});
        for (auto nw:v[l])
        {
            if (nw==1)
            {
                cout<<w;
                return 0;
            }
            if (w<dp[p[nw]][l]) dp[p[nw]][l]=w, q.push({w, p[nw], l});
        }
    }
    cout<<-1;
}

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