Submission #847145

#	Time	Username	Problem	Language	Result	Execution time	Memory
847145		vjudge1	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	100 / 100	443 ms	23764 KiB

skyscraper

#include <bits/stdc++.h>
#define fi first
#define se second
#define inf 0x3f3f3f3f
using namespace std;
using ll = long long;
const int nx=3e4+5;
const int sq=175;
int n, m, d[nx][sq], b[nx], p[nx], ans=inf;
vector<int> city[nx];
struct dak
{
    int i, w, p;
    bool operator <(const dak &o)
    const
    {
        return w>o.w;
    }
};
priority_queue<dak> f;
int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    cin>>n>>m;
    for(int i = 0; i < m; i++)
    {
        cin>>b[i]>>p[i];
        city[b[i]].emplace_back(i);
    }
    memset(d, 0x3f, sizeof(d));
    d[b[0]][0]=0;
    f.push({b[0], 0, 0});
    while(f.size())
    {
        dak v=f.top();
        f.pop();
        int u=v.i, w=v.w, pw=v.p;
        if(u==b[1])
            ans=min(ans, w);
        if(w!=d[u][pw])
            continue;
        if(!pw)
        {
            for(int i:city[u])
            {
                if(p[i]<sq)
                {
                    if(d[u][p[i]]>w)
                    {
                        d[u][p[i]]=w;
                        f.push({u, w, p[i]});
                    }
                }
                else
                {
                    for(int j = u%p[i]; j < n; j+=p[i])
                    {
                        if(d[j][0]>w+abs(u-j)/p[i])
                        {
                            d[j][0]=w+abs(u-j)/p[i];
                            f.push({j, d[j][0], 0});
                        }
                    }
                }
            }
        }
        else
        {
            if(u+pw<n && d[u+pw][pw]>w+1)
            {
                d[u+pw][pw]=w+1;
                f.push({u+pw, w+1, pw});
            }
            if(u-pw>=0 && d[u-pw][pw]>w+1)
            {
                d[u-pw][pw]=w+1;
                f.push({u-pw, w+1, pw});
            }
            if(d[u][0]>w)
            {
                d[u][0]=w;
                f.push({u, w, 0});
            }
        }
    }
    if(ans==inf)
        ans=-1;
    cout<<ans;
}

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