Submission #854150

#	Time	Username	Problem	Language	Result	Execution time	Memory
854150		Tenis0206	Climbers (RMI18_climbers)	C++11	0 / 100	22 ms	100236 KiB

climbers

#include <bits/stdc++.h>

using namespace std;

const int oo = INT_MAX;
const int nmax = 5e3;

int n;
int v[nmax + 5];

int d[nmax + 5][nmax + 5];

bool sel[nmax + 5][nmax + 5];

typedef pair<int,pair<int,int>> pii;

priority_queue<pii,vector<pii>,greater<pii>> h;

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    #ifdef home
    freopen("nr.in","r",stdin);
    freopen("nr.out","w",stdout);
    #endif // home
    cin>>n;
    for(int i=1;i<=n;i++)
    {
        cin>>v[i];
    }
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=n;j++)
        {
            d[i][j] = oo;
        }
    }
    d[1][n] = 0;
    h.push({0,{1,n}});
    while(!h.empty())
    {
        while(!h.empty() && sel[h.top().second.first][h.top().second.second])
        {
            h.pop();
        }
        if(h.empty())
        {
            break;
        }
        int st = h.top().second.first;
        int dr = h.top().second.second;
        h.pop();
        sel[st][dr] = true;
        if(st==dr)
        {
            cout<<d[st][dr]<<'\n';
            return 0;
        }
        for(int pst=-1;pst<=1;pst++)
        {
            for(int pdr=-1;pdr<=1;pdr++)
            {
                int new_st = st + pst;
                int new_dr = dr + pdr;
                if(new_st > n || new_st <= 0 || new_dr > n || new_dr <= 0)
                {
                    continue;
                }
                if(v[new_st] != v[new_dr])
                {
                    continue;
                }
                if(d[new_st][new_dr] > d[st][dr] + abs(v[st] - v[new_st]))
                {
                    d[new_st][new_dr] = d[st][dr] + abs(v[st] - v[new_st]);
                    h.push({d[new_st][new_dr],{new_st,new_dr}});
                }
            }
        }
    }
    cout<<"NO"<<'\n';
    return 0;
}

• Subtask 1: 0 / 25
• Subtask 2: 0 / 25
• Subtask 3: 0 / 50