Submission #660814

#	Time	Username	Problem	Language	Result	Execution time	Memory
660814		danikoynov	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	0 / 100	1 ms	340 KiB

skyscraper

#include <bits/stdc++.h>
#define endl '\n'

using namespace std;
typedef long long ll;

void speed()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
}

const int maxn = 30010;
const ll inf = 1e9;

struct doge
{
    int b, p;
} d[maxn];

struct edge
{
    int u;
    ll w;

    edge(int _u, ll _w)
    {
        u = _u;
        w = _w;
    }

    bool operator < (const edge &e) const
    {
        return w > e.w;
    }
};

bitset < 2010 > g[2010];

int n, m, used[2010][2010], op[2010];
int dp[2010];
void dijkstra(int s)
{
    for (int i = 0; i <= n; i ++)
        for (int j = 0; j <= n; j ++)
        used[i][j] = -1;
    for (int i = 0; i <= n; i ++)
        op[i] = -1;
    queue < int > q;
    q.push(d[0].b);
    op[d[0].b] = 0;
    while(!q.empty())
    {
        int cur = q.front();
        q.pop();

        int pos = g[cur]._Find_next(0);
        while(pos < n)
        {
            if (used[cur][pos] == -1)
                used[cur][pos] = op[cur];
            ///cout << cur << " : " << pos << " : " << used[cur][pos] << endl;
            int nb = cur + pos;
            if (nb < n && used[nb][pos] == -1)
            {
                used[nb][pos] = used[cur][pos] + 1;
                if (op[nb] == -1)
                    op[nb] = op[cur] + 1;
                g[nb][pos] = 1;
                q.push(nb);
            }
            nb = cur - pos;
            if (nb >= 0 && used[nb][pos] == -1)
            {
                used[nb][pos] = used[cur][pos] + 1;
                                if (op[nb] == -1)
                    op[nb] = op[cur] + 1;
                g[nb][pos] = 1;
                q.push(nb);
            }
            g[cur][pos] = 0;
            pos = g[cur]._Find_next(pos);
        }
    }
}
void solve()
{
    cin >> n >> m;

    for (int i = 0; i < m; i ++)
    {
        cin >> d[i].b >> d[i].p;
    }

    for (int i = 0; i < m; i ++)
    {
        g[d[i].b][d[i].p] = 1;
    }

    dijkstra(0);

    int ans = -1;
    for (int j = 1; j <= n; j ++)
    {
        if (used[d[1].b][j] != -1)
        {
            if (ans == -1 || ans > used[d[1].b][j])
                ans = used[d[1].b][j];
        }
    }
    cout << ans << endl;
}

int main()
{
    solve();
    return 0;
}
/**
7 2
2 7
2 10
*/

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