Submission #658502

#	Time	Username	Problem	Language	Result	Execution time	Memory
658502		ssense	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	57 / 100	549 ms	262144 KiB

skyscraper

#include <bits/stdc++.h>
#define startt ios_base::sync_with_stdio(false);cin.tie(0);
typedef long long  ll;
using namespace std;
#define vint vector<int>
#define all(v) v.begin(), v.end()
#define MOD 1000000007
#define MOD2 998244353
#define MX 1000000000
#define MXL 1000000000000000000
#define PI (ld)2*acos(0.0)
#define pb push_back
#define sc second
#define fr first
//#define int long long
#define endl '\n'
#define ld long double
#define NO cout << "NO" << endl
#define YES cout << "YES" << endl
//mesanu

int mp[30000][175];
bool used[30000][175];
vector<pair<int, int>> adj[30000*175];
int now = 1;
void cnn(int first, int second)
{
    mp[first][second] = now;
    now++;
}

int dijkstra(int s, int e)
{
    int n = now;
        vector<int> d(n, MX);

        d[s] = 0;
    priority_queue<pair<int, int>> q;
        q.push({0, s});
        while (!q.empty()) {
            int v = q.top().second;
            int dist = -q.top().first;
            q.pop();
            if(dist != d[v])
            {
                continue;
            }

            for (auto edge : adj[v]) {
                int to = edge.first;
                int len = edge.second;

                if (d[v] + len < d[to]) {
                    d[to] = d[v] + len;
                    q.push({-d[to], to});
                }
            }
        }
    return d[e];
}

void solve()
{
    int n, m;
    cin >> n >> m;
    int start = 0;
    int end = 0;
    int th = sqrt(n);
    for(int sky = 0; sky < n; sky++)
    {
        cnn(sky, 0);
    }
    for(int i = 0; i < m; i++)
    {
        int sky, power;
        cin >> sky >> power;
        if(i == 0)
        {
            start = sky;
        }
        if(i == 1)
        {
            end = sky;
        }
        if(power <= th)
        {
            if(used[sky][power])
            {
                continue;
            }
            used[sky][power] = true;
            if(mp[sky][power] != 0)
            {
                adj[mp[sky][0]].pb({mp[sky][power], 0});
                continue;
            }
            for(int j = sky%power; j < n; j+=power)
            {
                if(mp[j][power] == 0)
                {
                    cnn(j, power);
                }
                adj[mp[j][power]].pb({mp[j][0], 0});
                if(j+power < n)
                {
                    cnn(j+power, power);
                    adj[mp[j][power]].pb({mp[j+power][power], 1});
                    adj[mp[j+power][power]].pb({mp[j][power], 1});
                }
            }
            adj[mp[sky][0]].pb({mp[sky][power], 0});
        }
        else
        {
            for(int j = sky%power; j < n; j+=power)
            {
                adj[mp[sky][0]].pb({mp[j][0], abs(sky-j)/power});
            }
        }
    }
    int dist = dijkstra(mp[start][0], mp[end][0]);
    if(dist == MX)
    {
        cout << -1 << endl;
    }
    else
    {
        cout << dist << endl;
    }
}

int32_t main(){
    startt
    int t = 1;
    //cin >> t;
    while (t--) {
        solve();
    }
}


/*
5 3
0 2
1 1
4 1
 */

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