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Submission #226570

# Submission time Handle Problem Language Result Execution time Memory
226570 2020-04-24T10:57:21 Z MKopchev Portals (BOI14_portals) C++14
100 / 100
 326 ms 23224 KB 
#include<bits/stdc++.h>
using namespace std;
const int nmax=1e3+42;

int n,m;

char inp[nmax][nmax];

char get_in()
{
    char c=getchar();
    while(c!='.'&&c!='#'&&c!='S'&&c!='C')c=getchar();
    return c;
}

bool in(int i,int j)
{
    return 1<=i&&i<=n&&1<=j&&j<=m;
}
int nxt_left[nmax][nmax],nxt_right[nmax][nmax],nxt_up[nmax][nmax],nxt_down[nmax][nmax];

int dist[nmax][nmax];

priority_queue< pair<int, pair<int,int> > > pq;

int x_move[4]={1,-1,0,0};
int y_move[4]={0,0,1,-1};

int calc_dist(pair<int,int> a,pair<int,int> b)
{
    return abs(a.first-b.first)+abs(a.second-b.second);
}
int main()
{
    scanf("%i%i",&n,&m);

    for(int i=0;i<=n+1;i++)
        for(int j=0;j<=m+1;j++)
        {
            if(in(i,j)==0)inp[i][j]='#';
            else inp[i][j]=get_in();
        }

    for(int i=0;i<=n+1;i++)
        for(int j=0;j<=m+1;j++)
        {
            if(inp[i][j]=='#')nxt_left[i][j]=j;
            else nxt_left[i][j]=nxt_left[i][j-1];

            if(inp[i][j]=='#')nxt_up[i][j]=i;
            else nxt_up[i][j]=nxt_up[i-1][j];
        }

    for(int i=n+1;i>=0;i--)
        for(int j=m+1;j>=0;j--)
        {
            if(inp[i][j]=='#')nxt_right[i][j]=j;
            else nxt_right[i][j]=nxt_right[i][j+1];

            if(inp[i][j]=='#')nxt_down[i][j]=i;
            else nxt_down[i][j]=nxt_down[i+1][j];
        }
    /*
    for(int i=1;i<=n;i++)
        for(int j=1;j<=m;j++)
        {
            cout<<i<<" "<<j<<" -> "<<nxt_left[i][j]<<" "<<nxt_right[i][j]<<" "<<nxt_down[i][j]<<" "<<nxt_up[i][j]<<endl;
        }
    */


    for(int i=1;i<=n;i++)
        for(int j=1;j<=m;j++)
            dist[i][j]=1e9;

    for(int i=1;i<=n;i++)
        for(int j=1;j<=m;j++)
            if(inp[i][j]=='S')
            {
                pq.push({0,{i,j}});
                dist[i][j]=0;
            }

    while(pq.size())
    {
        pair<int, pair<int,int> > tp=pq.top();

        pq.pop();

        int d_now=-tp.first;

        int x=tp.second.first;
        int y=tp.second.second;

        if(dist[x][y]!=d_now)continue;

        if(in(x,y)==0)continue;

        //cout<<x<<" "<<y<<" -> "<<d_now<<endl;

        dist[x][y]=d_now;

        if(inp[x][y]=='C')
        {
            printf("%i\n",d_now);
            return 0;
        }

        if(inp[x][y]=='#')continue;

        //move adjacent
        for(int t=0;t<4;t++)
        {
            int x_=x+x_move[t];
            int y_=y+y_move[t];

            if(in(x_,y_))
            {
                if(dist[x_][y_]<=d_now+1)continue;

                pq.push({-(d_now+1),{x_,y_}});
                dist[x_][y_]=d_now+1;
            }
        }

        //use portals
        pair<int,int> go[4];

        go[0]={x,nxt_left[x][y]+1};
        go[1]={x,nxt_right[x][y]-1};
        go[2]={nxt_up[x][y]+1,y};
        go[3]={nxt_down[x][y]-1,y};

        for(int move_2=0;move_2<=3;move_2++)
        {
            //move (i,j) -> move_1 -> ( teleport ) move_2
            int lowest=1e9;

            for(int move_1=0;move_1<=3;move_1++)
                lowest=min(lowest,calc_dist({x,y},go[move_1])+1);

            if(dist[go[move_2].first][go[move_2].second]<=d_now+lowest)continue;

            pq.push({-(d_now+lowest),go[move_2]});

            dist[go[move_2].first][go[move_2].second]=d_now+lowest;
        }

    }

    assert(0==1);
    return 0;
}

Compilation message

portals.cpp: In function 'int main()':
portals.cpp:35:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%i%i",&n,&m);
     ~~~~~^~~~~~~~~~~~~~

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 4 ms 512 KB Output is correct
3 Correct 5 ms 640 KB Output is correct
4 Correct 5 ms 512 KB Output is correct
5 Correct 5 ms 640 KB Output is correct
6 Correct 5 ms 640 KB Output is correct
7 Correct 5 ms 640 KB Output is correct
8 Correct 5 ms 640 KB Output is correct
9 Correct 4 ms 512 KB Output is correct
10 Correct 4 ms 512 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 384 KB Output is correct
2 Correct 4 ms 640 KB Output is correct
3 Correct 5 ms 640 KB Output is correct
4 Correct 5 ms 512 KB Output is correct
5 Correct 5 ms 640 KB Output is correct
6 Correct 5 ms 640 KB Output is correct
7 Correct 5 ms 640 KB Output is correct
8 Correct 5 ms 640 KB Output is correct
9 Correct 6 ms 1536 KB Output is correct
10 Correct 5 ms 1408 KB Output is correct
11 Correct 5 ms 1536 KB Output is correct
12 Correct 6 ms 1536 KB Output is correct
13 Correct 5 ms 1536 KB Output is correct
14 Correct 4 ms 512 KB Output is correct
15 Correct 6 ms 1536 KB Output is correct
16 Correct 6 ms 512 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 384 KB Output is correct
2 Correct 4 ms 512 KB Output is correct
3 Correct 5 ms 640 KB Output is correct
4 Correct 4 ms 640 KB Output is correct
5 Correct 13 ms 4736 KB Output is correct
6 Correct 16 ms 4608 KB Output is correct
7 Correct 12 ms 4736 KB Output is correct
8 Correct 11 ms 4608 KB Output is correct

Subtask #4
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 640 KB Output is correct
3 Correct 5 ms 640 KB Output is correct
4 Correct 5 ms 512 KB Output is correct
5 Correct 5 ms 640 KB Output is correct
6 Correct 5 ms 640 KB Output is correct
7 Correct 6 ms 640 KB Output is correct
8 Correct 5 ms 640 KB Output is correct
9 Correct 6 ms 1408 KB Output is correct
10 Correct 5 ms 1408 KB Output is correct
11 Correct 5 ms 1408 KB Output is correct
12 Correct 7 ms 1408 KB Output is correct
13 Correct 5 ms 1408 KB Output is correct
14 Correct 13 ms 4608 KB Output is correct
15 Correct 15 ms 4736 KB Output is correct
16 Correct 12 ms 4736 KB Output is correct
17 Correct 14 ms 4608 KB Output is correct
18 Correct 14 ms 4736 KB Output is correct
19 Correct 7 ms 4608 KB Output is correct
20 Correct 11 ms 4736 KB Output is correct
21 Correct 12 ms 4608 KB Output is correct
22 Correct 13 ms 4608 KB Output is correct
23 Correct 14 ms 4608 KB Output is correct
24 Correct 14 ms 4608 KB Output is correct
25 Correct 5 ms 512 KB Output is correct
26 Correct 5 ms 1408 KB Output is correct
27 Correct 5 ms 512 KB Output is correct
28 Correct 9 ms 4608 KB Output is correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 640 KB Output is correct
3 Correct 5 ms 640 KB Output is correct
4 Correct 5 ms 512 KB Output is correct
5 Correct 5 ms 640 KB Output is correct
6 Correct 5 ms 640 KB Output is correct
7 Correct 5 ms 640 KB Output is correct
8 Correct 5 ms 640 KB Output is correct
9 Correct 6 ms 1408 KB Output is correct
10 Correct 6 ms 1536 KB Output is correct
11 Correct 5 ms 1408 KB Output is correct
12 Correct 5 ms 1408 KB Output is correct
13 Correct 5 ms 1408 KB Output is correct
14 Correct 12 ms 4608 KB Output is correct
15 Correct 16 ms 4608 KB Output is correct
16 Correct 13 ms 4712 KB Output is correct
17 Correct 13 ms 4736 KB Output is correct
18 Correct 17 ms 4736 KB Output is correct
19 Correct 8 ms 4608 KB Output is correct
20 Correct 12 ms 4736 KB Output is correct
21 Correct 12 ms 4608 KB Output is correct
22 Correct 13 ms 4736 KB Output is correct
23 Correct 15 ms 4736 KB Output is correct
24 Correct 243 ms 22008 KB Output is correct
25 Correct 326 ms 23224 KB Output is correct
26 Correct 52 ms 22908 KB Output is correct
27 Correct 148 ms 23224 KB Output is correct
28 Correct 170 ms 22776 KB Output is correct
29 Correct 203 ms 22832 KB Output is correct
30 Correct 194 ms 23032 KB Output is correct
31 Correct 14 ms 4736 KB Output is correct
32 Correct 230 ms 22776 KB Output is correct
33 Correct 5 ms 512 KB Output is correct
34 Correct 5 ms 1408 KB Output is correct
35 Correct 182 ms 22848 KB Output is correct
36 Correct 5 ms 512 KB Output is correct
37 Correct 9 ms 4736 KB Output is correct
38 Correct 93 ms 22776 KB Output is correct
39 Correct 159 ms 22776 KB Output is correct