Submission #46601

#	Time	Username	Problem	Language	Result	Execution time	Memory
46601		tieunhi	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	100 / 100	899 ms	27636 KiB

skyscraper

#include <bits/stdc++.h>
#define pii pair<int, int>
#define mp make_pair
#define F first
#define S second
#define PB push_back
#define N 30005
#define MAGIC 205
#define maxc 1000000007

using namespace std;

int n, m, b[N], p[N];
vector<int> vec[N];
int d[N][MAGIC];

struct state
{
    int l, x, w;
    state(int _l=0, int _x=0, int _w=0) : l(_l), x(_x), w(_w) {}
    bool operator < (const state &rhs) const
    {
        return l > rhs.l;
    }
};
int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    //freopen("INP.TXT", "r", stdin);
    cin >> n >> m;
    for (int i = 0; i < m; i++)
    {
        cin >> b[i] >> p[i];
        vec[b[i]].PB(p[i]);
    }
    priority_queue<state>q;
    q.push(state(0, b[0], 0));

    memset(d, 60, sizeof d);
    d[b[0]][0] = 0;
    while (!q.empty())
    {
        auto z = q.top(); q.pop();
        int l = z.l;
        int x = z.x;
        int w = z.w;

        if (d[x][w] < l) continue;

        if (x == b[1])
        {
            cout <<l;
            return 0;
        }
        if (w)
        {
            if (d[x][0] > l) {
                d[x][0] = l; q.push(state(l, x, 0));
            }
            if (x + w < n && d[x + w][w] > l + 1) {
                d[x + w][w] = l+1; q.push(state(l+1, x+w, w));
            }
            if (x - w >= 0 && d[x - w][w] > l + 1) {
                d[x - w][w] = l+1; q.push(state(l+1, x-w, w));
            }
        }
        else
        {
            for (auto ww : vec[x])
            {
                if (ww >= MAGIC)
                {
                    for (int y = x % ww; y < n; y += ww)
                        if (d[y][0] > d[x][w] + abs(x - y)/ww)
                        {
                            d[y][0] = d[x][w] + abs(x - y)/ww;
                            q.push(state(d[y][0], y, 0));
                        }
                }
                else
                {
                    if (d[x][ww] > l)
                    {
                        d[x][ww] = l;
                        q.push(state(d[x][ww], x, ww));
                    }
                }
            }
        }
    }
    cout <<-1;
}

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