oj.uz

Submission #581294

# Submission time Handle Problem Language Result Execution time Memory
581294 2022-06-22T12:52:46 Z qwerasdfzxcl Robots (APIO13_robots) C++14
60 / 100
 1500 ms 96828 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[9][9][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/9][t%9][i][j] = 1e9;
            }
        }
    }
 
 
    //printf("%d %d %d\n", to[1][1][0].x, to[1][1][0].y, to[1][1][0].d);
}
 
 
 
void bfs(int l, int r){
    //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[l][r][i][j] = 0;
            if (dist[l][r][i][j]<1e9) pq.emplace(i, j, dist[l][r][i][j]);
        }
    }
 
 
    while(!pq.empty()){
        auto [x, y, dd] = pq.top(); pq.pop();
        if (dd!=dist[l][r][x][y]) continue;
        //if (t==21 && dist[l][r][x][y]==2) printf("YES %d %d\n", x, y);
        for (int i=0;i<l;i++){
            dist[i][r][x][y] = min(dist[i][r][x][y], dist[i][l-1][x][y] + dist[l][r][x][y]);
        }
        for (int i=r+1;i<n;i++){
            dist[l][i][x][y] = min(dist[l][i][x][y], dist[l][r][x][y] + dist[r+1][i][x][y]);
        }
 
        for (int d=0;d<4;d++){
            int nx = to[x][y][d].x, ny = to[x][y][d].y;
            if (!nx) continue;
            if (dist[l][r][nx][ny] <= dist[l][r][x][y] + 1) continue;
 
            dist[l][r][nx][ny] = dist[l][r][x][y] + 1;
            pq.emplace(nx, ny, dist[l][r][nx][ny]);
 
        }
    }
}
 
int main(){
 
    scanf("%d %d %d", &n, &w, &h);
    init();
 
    for (int d=0;d<n;d++){
        for (int i=0;i<n-d;i++){
            int j = i+d;
            bfs(i, 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[3][3][i][j]!=1e9)printf("%d ", dist[3][3][i][j]);
            //else printf("x ");
            ans = min(ans, dist[0][n-1][i][j]);
        }
        //printf("\n");
    }
    printf("%d\n", ans==1e9?-1:ans);
    return 0;
}

Compilation message

robots.cpp: In function 'void bfs(int, int)':
robots.cpp:75:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   75 |         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:99:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   99 |     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 2 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 2 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
30.0 / 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 2 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 148 ms 55060 KB Output is correct
12 Correct 32 ms 54384 KB Output is correct
13 Correct 42 ms 54700 KB Output is correct
14 Correct 504 ms 55928 KB Output is correct
15 Correct 102 ms 54748 KB Output is correct

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 2 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 148 ms 55060 KB Output is correct
12 Correct 32 ms 54384 KB Output is correct
13 Correct 42 ms 54700 KB Output is correct
14 Correct 504 ms 55928 KB Output is correct
15 Correct 102 ms 54748 KB Output is correct
16 Correct 93 ms 93776 KB Output is correct
17 Execution timed out 1565 ms 96828 KB Time limit exceeded
18 Halted 0 ms 0 KB -