oj.uz

Submission #581225

# Submission time Handle Problem Language Result Execution time Memory
581225 2022-06-22T11:53:50 Z qwerasdfzxcl Robots (APIO13_robots) C++14
30 / 100
 136 ms 55044 KB 
#include <bits/stdc++.h>

typedef long long ll;
using namespace std;
struct Vertex{
    int x, y, d;
    Vertex(){}
    Vertex(int _x, int _y, int _d): x(_x), y(_y), d(_d) {}
    bool operator<(const Vertex &V) const{
        return d > V.d;
    }
}to[505][505][4];
char a[505][505];
bool visited[505][505][4];
int dx[4] = {-1, 0, 1, 0}, dy[4] = {0, 1, 0, -1}, n, w, h;

int dist[81][505][505];

void dfs(int x, int y, int d){
    visited[x][y][d] = 1;
    int nx, ny, nd = d;
    if (a[x][y]=='A') nd = (d+3)%4;
    if (a[x][y]=='C') nd = (d+1)%4;
    nx = x + dx[nd], ny = y + dy[nd];

    if (a[nx][ny]=='x') to[x][y][d] = Vertex(x, y, d);
    else if (visited[nx][ny][nd]) to[x][y][d] = to[nx][ny][nd];
    else{
        dfs(nx, ny, nd);
        to[x][y][d] = to[nx][ny][nd];
    }
}

void init(){
    for (int i=0;i<=h+1;i++) fill(a[i], a[i]+w+2, 'x');
    for (int i=1;i<=h;i++){
        scanf("%s", a[i]+1);
        a[i][w+1] = 'x';
    }

    for (int i=1;i<=h;i++){
        for (int j=1;j<=w;j++){
            for (int d=0;d<4;d++) if (!visited[i][j][d]) dfs(i, j, d);
        }
    }

    for (int t=0;t<81;t++){
        for (int i=1;i<=h;i++){
            for (int j=1;j<=w;j++){
                dist[t][i][j] = 1e9;
            }
        }
    }


    //printf("%d %d %d\n", to[2][6][1].x, to[2][6][1].y, to[2][6][1].d);
}



void bfs(int t){
    int l = t/9, r = t%9;
    //printf(" %d %d\n", l, r);

    priority_queue<Vertex> pq;

    for (int i=1;i<=h;i++){
        for (int j=1;j<=w;j++){
            if (l==r&& a[i][j]=='1'+l) dist[t][i][j] = 0;
            if (dist[t][i][j]<1e9) pq.emplace(i, j, dist[t][i][j]);
        }
    }


    while(!pq.empty()){
        auto [x, y, dd] = pq.top(); pq.pop();
        if (dd!=dist[t][x][y]) continue;
        //if (t==21 && dist[t][x][y]==2) printf("YES %d %d\n", x, y);
        for (int i=0;i<l;i++){
            dist[i*9+r][x][y] = min(dist[i*9+r][x][y], dist[i*9+l-1][x][y] + dist[t][x][y]);
        }

        for (int d=0;d<4;d++){
            int nx = to[x][y][d].x, ny = to[x][y][d].y;
            //if (!nx) printf("%d %d %d\n", x, y, d);
            assert(nx);
            if (dist[t][nx][ny] <= dist[t][x][y] + 1) continue;

            dist[t][nx][ny] = dist[t][x][y] + 1;
            pq.emplace(nx, ny, dist[t][nx][ny]);

        }
    }
}

int main(){

    scanf("%d %d %d", &n, &w, &h);
    init();

    for (int d=0;d<n-1;d++){
        for (int i=0;i<n-d;i++){
            int j = i+d;
            bfs(i*9+j);
        }
    }
    int ans = 1e9;
    for (int i=1;i<=h;i++){
        for (int j=1;j<=w;j++){
            //if (dist[0][i][j]==0 && dist[1][i][j]==0) printf("%d %d\n", i, j);
            //if (dist[30][i][j]!=1e9)printf("%d ", dist[30][i][j]);
            //else printf("x ");
            ans = min(ans, dist[n-1][i][j]);
        }
        //printf("\n");
    }
    printf("%d\n", ans==1e9?-1:ans);
    return 0;
}

Compilation message

robots.cpp: In function 'void bfs(int)':
robots.cpp:76:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   76 |         auto [x, y, dd] = pq.top(); pq.pop();
      |              ^
robots.cpp: In function 'void init()':
robots.cpp:37:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |         scanf("%s", a[i]+1);
      |         ~~~~~^~~~~~~~~~~~~~
robots.cpp: In function 'int main()':
robots.cpp:98:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   98 |     scanf("%d %d %d", &n, &w, &h);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 724 KB Output is correct
2 Correct 1 ms 724 KB Output is correct
3 Correct 1 ms 724 KB Output is correct
4 Correct 1 ms 2260 KB Output is correct
5 Correct 1 ms 2260 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 724 KB Output is correct
2 Correct 1 ms 724 KB Output is correct
3 Correct 1 ms 724 KB Output is correct
4 Correct 1 ms 2260 KB Output is correct
5 Correct 1 ms 2260 KB Output is correct
6 Correct 1 ms 852 KB Output is correct
7 Correct 1 ms 724 KB Output is correct
8 Correct 1 ms 1108 KB Output is correct
9 Correct 1 ms 852 KB Output is correct
10 Correct 1 ms 2260 KB Output is correct

Subtask #3
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 724 KB Output is correct
2 Correct 1 ms 724 KB Output is correct
3 Correct 1 ms 724 KB Output is correct
4 Correct 1 ms 2260 KB Output is correct
5 Correct 1 ms 2260 KB Output is correct
6 Correct 1 ms 852 KB Output is correct
7 Correct 1 ms 724 KB Output is correct
8 Correct 1 ms 1108 KB Output is correct
9 Correct 1 ms 852 KB Output is correct
10 Correct 1 ms 2260 KB Output is correct
11 Correct 136 ms 55044 KB Output is correct
12 Incorrect 26 ms 54332 KB Output isn't correct
13 Halted 0 ms 0 KB -

Subtask #4
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 724 KB Output is correct
2 Correct 1 ms 724 KB Output is correct
3 Correct 1 ms 724 KB Output is correct
4 Correct 1 ms 2260 KB Output is correct
5 Correct 1 ms 2260 KB Output is correct
6 Correct 1 ms 852 KB Output is correct
7 Correct 1 ms 724 KB Output is correct
8 Correct 1 ms 1108 KB Output is correct
9 Correct 1 ms 852 KB Output is correct
10 Correct 1 ms 2260 KB Output is correct
11 Correct 136 ms 55044 KB Output is correct
12 Incorrect 26 ms 54332 KB Output isn't correct
13 Halted 0 ms 0 KB -