Submission #1025165

#	Time	Username	Problem	Language	Result	Execution time	Memory
1025165		Dennis_Jason	Awesome Arrowland Adventure (eJOI19_adventure)	C++14	100 / 100	76 ms	37572 KiB

adventure

#include <bits/stdc++.h>
#define NMAX 250001
#define int long long
#define MAX 1001
#define pb push_back
#define eb emplace_back
#define MOD 1000000007
#define nl '\n'
#define INF  1000000007
#define LLONG_MAX 9223372036854775807
#define pii pair<int,int>
#define tpl tuple<int,int,int,int>
#pragma GCC optimize("O3")
using namespace std;
ifstream fin("aib.in");
ofstream fout("aib.out");
int n,m;
int mat[501][501];
bool vis[501][501];
int dp[501][501];
bool inmat(int i,int j)
{
    return i>=1 && i<=n && j>=1 && j<=m;
}
vector<vector<pii>>G(NMAX);
int ind;
vector<int>dist(NMAX);
int calc_pos(int i,int j)
{
    return (i-1)*m+j;
}
void dijkstra(int node)
{
    priority_queue<pii,vector<pii>,greater<pii>>pq;
    pq.push({0,node});
    dist[node]=0;
    while(!pq.empty())
    {
        auto [rot,first]=pq.top();
        pq.pop();
        for(auto [x,w]:G[first])
        {
            if(dist[x]>dist[first]+w)
            {
                dist[x]=dist[first]+w;
                pq.push({dist[x],x});
            }
        }
    }
}
signed main()
{
    cin>>n>>m;
    for(int i=1;i<=n;++i)
    {
        for(int j=1;j<=m;++j)
        {
            char x;
            cin>>x;
            if(x=='N')
                mat[i][j]=1;
            else if(x=='E')
                mat[i][j]=2;
            else if(x=='S')
                mat[i][j]=3;
            else if(x=='W')
                mat[i][j]=4;
            else
                mat[i][j]=5;
        }
    }
    for(int i=1;i<=n;++i)
    {
        for(int j=1;j<=m;++j)
        {
            dist[calc_pos(i,j)]=INF;
            if(mat[i][j]==1)
            {
                if(inmat(i-1,j))
                    G[calc_pos(i,j)].pb({calc_pos(i-1,j),0});
                if(inmat(i,j+1))
                    G[calc_pos(i,j)].pb({calc_pos(i,j+1),1});
                if(inmat(i+1,j))
                    G[calc_pos(i,j)].pb({calc_pos(i+1,j),2});
                if(inmat(i,j-1))
                    G[calc_pos(i,j)].pb({calc_pos(i,j-1),3});
            }
            else if(mat[i][j]==2)
            {
                if(inmat(i,j+1))
                    G[calc_pos(i,j)].pb({calc_pos(i,j+1),0});
                if(inmat(i+1,j))
                    G[calc_pos(i,j)].pb({calc_pos(i+1,j),1});
                if(inmat(i,j-1))
                    G[calc_pos(i,j)].pb({calc_pos(i,j-1),2});
                if(inmat(i-1,j))
                    G[calc_pos(i,j)].pb({calc_pos(i-1,j),3});
            }
            else if(mat[i][j]==3)
            {
                if(inmat(i+1,j))
                    G[calc_pos(i,j)].pb({calc_pos(i+1,j),0});
                if(inmat(i,j-1))
                    G[calc_pos(i,j)].pb({calc_pos(i,j-1),1});
                if(inmat(i-1,j))
                    G[calc_pos(i,j)].pb({calc_pos(i-1,j),2});
                if(inmat(i,j+1))
                    G[calc_pos(i,j)].pb({calc_pos(i,j+1),3});
            }
            else if(mat[i][j]==4)
            {
                if(inmat(i,j-1))
                    G[calc_pos(i,j)].pb({calc_pos(i,j-1),0});
                if(inmat(i-1,j))
                    G[calc_pos(i,j)].pb({calc_pos(i-1,j),1});
                if(inmat(i,j+1))
                    G[calc_pos(i,j)].pb({calc_pos(i,j+1),2});
                if(inmat(i+1,j))
                    G[calc_pos(i,j)].pb({calc_pos(i+1,j),3});
            }
        }
    }
    if(mat[1][1]==5)
    {
        cout<<-1;
        return 0;
    }
    dijkstra(1);
    if(dist[calc_pos(n,m)]==INF)
        cout<<-1;
    else
        cout<<dist[calc_pos(n,m)];



    return 0;
}

Compilation message (stderr)

adventure.cpp:10: warning: "LLONG_MAX" redefined
   10 | #define LLONG_MAX 9223372036854775807
      | 
In file included from /usr/lib/gcc/x86_64-linux-gnu/10/include/limits.h:195,
                 from /usr/lib/gcc/x86_64-linux-gnu/10/include/syslimits.h:7,
                 from /usr/lib/gcc/x86_64-linux-gnu/10/include/limits.h:34,
                 from /usr/include/c++/10/climits:42,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:39,
                 from adventure.cpp:1:
/usr/include/limits.h:135: note: this is the location of the previous definition
  135 | #  define LLONG_MAX __LONG_LONG_MAX__
      | 
adventure.cpp: In function 'void dijkstra(long long int)':
adventure.cpp:39:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   39 |         auto [rot,first]=pq.top();
      |              ^
adventure.cpp:41:18: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   41 |         for(auto [x,w]:G[first])
      |                  ^

• Subtask 1: 10 / 10
• Subtask 2: 12 / 12
• Subtask 3: 12 / 12
• Subtask 4: 16 / 16
• Subtask 5: 50 / 50