Problem:


Score : 600 points

Problem Statement

Snuke, a water strider, lives in a rectangular pond that can be seen as a grid with H east-west rows and W north-south columns. Let (i,j) be the square at the i-th row from the north and j-th column from the west.

Some of the squares have a lotus leaf on it and cannot be entered.
The square (i,j) has a lotus leaf on it if c_{ij} is @, and it does not if c_{ij} is ..

In one stroke, Snuke can move between 1 and K squares (inclusive) toward one of the four directions: north, east, south, and west.
The move may not pass through a square with a lotus leaf. Moving to such a square or out of the pond is also forbidden.

Find the minimum number of strokes Snuke takes to travel from the square (x_1,y_1) to (x_2,y_2).
If the travel from (x_1,y_1) to (x_2,y_2) is impossible, point out that fact.

Constraints

1 \leq H,W,K \leq 10^6

H \times W \leq 10^6

1 \leq x_1,x_2 \leq H

1 \leq y_1,y_2 \leq W

x_1 \neq x_2 or y_1 \neq y_2.

c_{i,j} is . or @.

c_{x_1,y_1} = .

c_{x_2,y_2} = .

All numbers in input are integers.

Input

Input is given from Standard Input in the following format:

H W K
x_1 y_1 x_2 y_2
c_{1,1}c_{1,2} .. c_{1,W}
c_{2,1}c_{2,2} .. c_{2,W}
:
c_{H,1}c_{H,2} .. c_{H,W}

Output

Print the minimum number of strokes Snuke takes to travel from the square (x_1,y_1) to (x_2,y_2), or print -1 if the travel is impossible.

Sample Input 1

3 5 2
3 2 3 4
.....
.@..@
..@..

Sample Output 1

5

Initially, Snuke is at the square (3,2).
He can reach the square (3, 4) by making five strokes as follows:

From (3, 2), go west one square to (3, 1).

From (3, 1), go north two squares to (1, 1).

From (1, 1), go east two squares to (1, 3).

From (1, 3), go east one square to (1, 4).

From (1, 4), go south two squares to (3, 4).

Sample Input 2

1 6 4
1 1 1 6
......

Sample Output 2

2

Sample Input 3

3 3 1
2 1 2 3
.@.
.@.
.@.

Sample Output 3

-1



Sample input:
3 5 2
3 2 3 4
.....
.@..@
..@..


Sample output:
5

Submission status: Accepted

Solution code:
import sys
sys.setrecursionlimit(10 ** 7)

from collections import deque
INF = float('inf')
def resolve():
    H, W, K = map(int, input().split())
    sx, sy, gx, gy = map(lambda x:int(x)-1, input().split())
    G = [list(input()) for _ in range(H)]

    dist = [[INF] * W for i in range(H)]
    dist[sx][sy] = 0
    q = deque([(sx, sy)])

    drc = [(-1, 0), (0, 1), (1, 0), (0, -1)]
    while q:
        x, y = q.popleft()
        if (x, y) == (gx, gy):
            print(dist[x][y])
            return
        for dx, dy in drc:
            nx = x
            ny = y
            for k in range(K):
                nx += dx
                ny += dy
                if 0 <= nx < H and 0 <= ny < W and G[nx][ny] != '@':
                    if dist[nx][ny] <= dist[x][y]:
                        break
                    if dist[nx][ny] == INF:
                        q.append((nx, ny))
                    dist[nx][ny] = dist[x][y] + 1
                else:
                    break
    print(-1)

if __name__ == "__main__":
    resolve()

Submission status: Accepted

Solution code:
def main():
  h,w,k=map(int,input().split())
  si,sj,ti,tj=map(int,input().split())
  si-=1
  sj-=1
  ti-=1
  tj-=1
  b=[input()for _ in range(h)]
  ans=[[-1]*w for _ in range(h)]
  ans[si][sj]=0
  from collections import deque
  d=deque()
  d.append((si,sj))
  while d:
    x,y=d.popleft()
    if x==ti and y==tj:
      exit(print(ans[x][y]))
    for dx,dy in [[1,0],[-1,0],[0,-1],[0,1]]:
      for i in range(1,k+1):
        xx=x+dx*i
        yy=y+dy*i
        if not(0<=xx<h and 0<=yy<w) or b[xx][yy]=="@":break
        if 0<=ans[xx][yy]<=ans[x][y]:break
        if ans[xx][yy]==-1:d.append((xx,yy))
        ans[xx][yy]=ans[x][y]+1
  print(-1)
if __name__ == "__main__":
  main()

Submission status: Accepted

Solution code:
from collections import deque
import sys

int1 = lambda x: int(x) - 1
p2D = lambda x: print(*x, sep="\n")
def II(): return int(sys.stdin.readline())
def MI(): return map(int, sys.stdin.readline().split())
def MI1(): return map(int1, sys.stdin.readline().split())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def SI(): return sys.stdin.readline()[:-1]

def main():
    inf=10**9
    h,w,k=MI()
    x1,y1,x2,y2=MI1()
    aa=[[0 if c=="@" else inf for c in SI()] for _ in range(h)]
    #p2D(aa)

    aa[x1][y1]=0
    q=deque()
    q.append((x1,y1,0))
    while q:
        x,y,d=q.popleft()
        for nx in range(x+1,min(x+k+1,h)):
            if aa[nx][y] == d + 1:continue
            if aa[nx][y]<d+1:break
            aa[nx][y]=d+1
            q.append((nx,y,d+1))
        for nx in range(x-1,max(x-k-1,-1),-1):
            if aa[nx][y] == d + 1:continue
            if aa[nx][y]<d+1:break
            aa[nx][y]=d+1
            q.append((nx,y,d+1))
        for ny in range(y+1,min(y+k+1,w)):
            if aa[x][ny] == d + 1:continue
            if aa[x][ny]<d+1:break
            aa[x][ny]=d+1
            q.append((x,ny,d+1))
        for ny in range(y-1,max(y-k-1,-1),-1):
            if aa[x][ny] == d + 1:continue
            if aa[x][ny]<d+1:break
            aa[x][ny]=d+1
            q.append((x,ny,d+1))
        #p2D(aa)
        #print()

    ans=aa[x2][y2]
    if ans==inf:print(-1)
    else:print(ans)

main()

Submission status: Accepted

Solution code:
#!/usr/bin/env python3
from collections import defaultdict,deque
import sys
sys.setrecursionlimit(10**5)
input = sys.stdin.readline
def LI(): return map(int, input().split())
def LF(): return list(map(float, input().split()))
def LI_(): return list(map(lambda x: int(x)-1, input().split()))
def II(): return int(input())
def IF(): return float(input())
def S(): return input().rstrip()
def LS(): return S().split()
def IR(n): return [II() for _ in range(n)]
def LIR(n): return [LI() for _ in range(n)]
def FR(n): return [IF() for _ in range(n)]
def LFR(n): return [LI() for _ in range(n)]
def LIR_(n): return [LI_() for _ in range(n)]
def SR(n): return [S() for _ in range(n)]
def LSR(n): return [LS() for _ in range(n)]
mod = 1000000007
inf = float("INF")

#solve
def solve():
    h, w, K = LI()
    y1, x1, y2, x2 = LI()
    q = deque()
    field = [[False] * (w + 2)] + [None] * h + [[False] * (w + 2)]
    for i in range(1, h + 1):
        field[i] = [False] + [True] * w + [False]
    for i in range(1, h + 1):
        s = input().rstrip()
        for j in range(1, w + 1):
            if s[j-1] == "@":
                field[i][j] = False
    q.append((x1, y1))
    ans = 0
    c = [[0] * (w + 2) for i in range(h + 2)]
    while q:
        next_q = deque()
        while q:
            x, y = q.pop()
            if (x, y) == (x2, y2):
                print(ans)
                return
            for i in range(1, K + 1):
                if field[y + i][x]:
                    if not c[y + i][x]:
                        next_q.append((x, y + i))
                        c[y + i][x] = 1
                else:
                    break
            for i in range(1, K + 1):
                if field[y][x + i]:
                    if not c[y][x + i]:
                        next_q.append((x + i, y))
                        c[y][x + i] = 1
                else:
                    break
            for i in range(1, K + 1):
                if field[y - i][x]:
                    if not c[y - i][x]:
                        next_q.append((x, y - i))
                        c[y - i][x] = 1
                else:
                    break
            for i in range(1, K + 1):
                if field[y][x - i]:
                    if not c[y][x - i]:
                        next_q.append((x - i, y))
                        c[y][x - i] = 1
                else:
                    break
            field[y][x] = False
        ans += 1
        q = next_q
    print(-1)
    return


#main
if __name__ == '__main__':
    solve()

Submission status: Accepted

Solution code:
#!/usr/bin/env python3
from collections import defaultdict,deque
import sys
sys.setrecursionlimit(10**5)
input = sys.stdin.readline
def LI(): return map(int, input().split())
def LF(): return list(map(float, input().split()))
def LI_(): return list(map(lambda x: int(x)-1, input().split()))
def II(): return int(input())
def IF(): return float(input())
def S(): return input().rstrip()
def LS(): return S().split()
def IR(n): return [II() for _ in range(n)]
def LIR(n): return [LI() for _ in range(n)]
def FR(n): return [IF() for _ in range(n)]
def LFR(n): return [LI() for _ in range(n)]
def LIR_(n): return [LI_() for _ in range(n)]
def SR(n): return [S() for _ in range(n)]
def LSR(n): return [LS() for _ in range(n)]
mod = 1000000007
inf = float("INF")

#solve
def solve():
    mxy = [(0, 1), (1, 0), (-1, 0), (0, -1)]
    h, w, K = LI()
    y1, x1, y2, x2 = LI()
    q = deque()
    field = [[False] * (w + 2)] + [None] * h + [[False] * (w + 2)]
    for i in range(1, h + 1):
        field[i] = [False] + [True] * w + [False]
    for i in range(1, h + 1):
        s = input().rstrip()
        for j in range(1, w + 1):
            if s[j-1] == "@":
                field[i][j] = False
    q.append((x1, y1))
    ans = 0
    c = [[0] * (w + 2) for i in range(h + 2)]
    while q:
        next_q = deque()
        while q:
            x, y = q.pop()
            if (x, y) == (x2, y2):
                print(ans)
                return
            if field[y][x]:
                for i in range(1, K + 1):
                    if field[y + i][x]:
                        if not c[y + i][x]:
                            next_q.append((x, y + i))
                            c[y + i][x] = 1
                    else:
                        break
                for i in range(1, K + 1):
                    if field[y][x + i]:
                        if not c[y][x + i]:
                            next_q.append((x + i, y))
                            c[y][x + i] = 1
                    else:
                        break
                for i in range(1, K + 1):
                    if field[y - i][x]:
                        if not c[y - i][x]:
                            next_q.append((x, y - i))
                            c[y - i][x] = 1
                    else:
                        break
                for i in range(1, K + 1):
                    if field[y][x - i]:
                        if not c[y][x - i]:
                            next_q.append((x - i, y))
                            c[y][x - i] = 1
                    else:
                        break
                field[y][x] = False
        ans += 1
        q = next_q
    print(-1)
    return


#main
if __name__ == '__main__':
    solve()

Submission status: Accepted

Solution code:
#!/usr/bin/env python3
from collections import defaultdict,deque
from heapq import heappush, heappop
from bisect import bisect_left, bisect_right
import sys, random, itertools, math
sys.setrecursionlimit(10**5)
input = sys.stdin.readline
sqrt = math.sqrt
def LI(): return map(int, input().split())
def LF(): return list(map(float, input().split()))
def LI_(): return list(map(lambda x: int(x)-1, input().split()))
def II(): return int(input())
def IF(): return float(input())
def S(): return input().rstrip()
def LS(): return S().split()
def IR(n): return [II() for _ in range(n)]
def LIR(n): return [LI() for _ in range(n)]
def FR(n): return [IF() for _ in range(n)]
def LFR(n): return [LI() for _ in range(n)]
def LIR_(n): return [LI_() for _ in range(n)]
def SR(n): return [S() for _ in range(n)]
def LSR(n): return [LS() for _ in range(n)]
mod = 1000000007
inf = float("INF")

#solve
def solve():
    mxy = [(0, 1), (1, 0), (-1, 0), (0, -1)]
    h, w, K = LI()
    y1, x1, y2, x2 = LI()
    q = deque()
    field = [[False] * (w + 2)] + [None] * h + [[False] * (w + 2)]
    for i in range(1, h + 1):
        field[i] = [False] + [True] * w + [False]
    for i in range(1, h + 1):
        s = input().rstrip()
        for j in range(1, w + 1):
            if s[j-1] == "@":
                field[i][j] = False
    q.append((x1, y1))
    ans = 0
    c = [[0] * (w + 2) for i in range(h + 2)]
    while q:
        next_q = deque()
        while q:
            x, y = q.pop()
            if (x, y) == (x2, y2):
                print(ans)
                return
            if field[y][x]:
                for i in range(1, K + 1):
                    if field[y + i][x]:
                        if not c[y + i][x]:
                            next_q.append((x, y + i))
                            c[y + i][x] = 1
                    else:
                        break
                for i in range(1, K + 1):
                    if field[y][x + i]:
                        if not c[y][x + i]:
                            next_q.append((x + i, y))
                            c[y][x + i] = 1
                    else:
                        break
                for i in range(1, K + 1):
                    if field[y - i][x]:
                        if not c[y - i][x]:
                            next_q.append((x, y - i))
                            c[y - i][x] = 1
                    else:
                        break
                for i in range(1, K + 1):
                    if field[y][x - i]:
                        if not c[y][x - i]:
                            next_q.append((x - i, y))
                            c[y][x - i] = 1
                    else:
                        break
                field[y][x] = False
        ans += 1
        q = next_q
    print(-1)
    return


#main
if __name__ == '__main__':
    solve()

Submission status: Accepted

Solution code:
def f_pond_skater():
    from heapq import heappush, heappop
    H, W, K = [int(i) for i in input().split()]
    start_row, start_col, target_row, target_col = [int(i) - 1 for i in input().split()]
    Grid = [input() for _ in range(H)]

    heap = []
    dist = [[float('inf')] * W for _ in range(H)]
    dist[start_row][start_col] = 0

    diff = ((0, 1), (1, 0), (0, -1), (-1, 0))
    heappush(heap, (0, start_row, start_col))
    while heap:
        cost, row, col = heappop(heap)
        cost_next = cost + 1

        if row == target_row and col == target_col:
            return cost

        for dr, dc in diff:
            nr, nc = row, col
            for _ in range(K):
                nr += dr
                nc += dc
                if not (0 <= nr < H and 0 <= nc < W) or Grid[nr][nc] == '@':
                    break
                if dist[nr][nc] > cost_next:
                    dist[nr][nc] = cost_next
                    heappush(heap, (cost_next, nr, nc))
                elif dist[nr][nc] == cost_next:
                    continue
                else:
                    break
    return -1

print(f_pond_skater())

Submission status: Accepted

Solution code:
from collections import deque
h,w,k = map(int,input().split())
y1,x1,gy,gx = map(int,input().split())
m = ["@"*(w+2)]+["@"+input()+"@" for i in range(h)]+["@"*(w+2)]
opt = [(1,0),(0,1),(-1,0),(0,-1)]
dq=deque([(y1,x1)])
ans = 0
temp = [[-1]*(w+2) for i in range(h+2)]
temp[y1][x1] = 0
cnt = 0
while dq:
    # cnt += 1
    # print(cnt)
    y,x = dq.popleft()
    # print(dq,y,x)
    for j in opt:
        y1 = y+j[0]
        x1 = x+j[1]
        if m[y1][x1] == "@":
            # print(y1,x1,"@@")
            continue
        if temp[y1][x1] == -1 or temp[y1][x1]-temp[y][x]>0:
            for i in range(k):
                if (temp[y1+i*j[0]][x1+i*j[1]] == -1 or temp[y1+i*j[0]][x1+i*j[1]]-temp[y][x]>0) and m[y1+i*j[0]][x1+i*j[1]] == ".":
                    if temp[y1+i*j[0]][x1+i*j[1]]-temp[y][x]==1:
                        continue
                    temp[y1+i*j[0]][x1+i*j[1]] = temp[y][x]+1
                    dq.append((y1+i*j[0],x1+i*j[1]))
                    # print(y1+i*j[0],x1+i*j[1],"a",k,m[y1+i*j[0]][x1+i*j[1]],temp[y1+i*j[0]][x1+i*j[1]])
                else:
                    # print(y1+i*j[0],x1+i*j[1],"b",k,m[y1+i*j[0]][x1+i*j[1]],temp[y1+i*j[0]][x1+i*j[1]])
                    break
    # for i in temp:
    #     print(i)
# print(temp)
print(temp[gy][gx])

Submission status: Accepted

Solution code:
from collections import deque
H,W,K = map(int,input().split())
x1,y1,x2,y2 = map(int,input().split())

maze = []
maze.append(["@"]*(W+2))
for _ in range(H):
  row = list(input())
  maze.append(["@"]+row+["@"])
maze.append(["@"]*(W+2))

q = deque([(x1,y1)])
depth = 0
while q:
  for i,j in q:
    maze[i][j] = "@"

  new_q = set()
  l = len(q)
  for _ in range(l):
    x,y = q.pop()
    if (x,y) == (x2,y2):
      print(depth)
      exit()

    # Up
    for i in range(1, K+1):
      if maze[x-i][y] == "@": break
      new_q.add((x-i, y))

    # Down
    for i in range(1, K+1):
      if maze[x+i][y] == "@": break
      new_q.add((x+i, y))

    # Left
    for i in range(1, K+1):
      if maze[x][y-i] == "@": break
      new_q.add((x, y-i))

    # Right
    for i in range(1, K+1):
      if maze[x][y+i] == "@": break
      new_q.add((x, y+i))

  q = deque(list(new_q))
  depth += 1

print(-1)

Submission status: Accepted

Solution code:
import sys

def input(): return sys.stdin.readline().strip()
def list2d(a, b, c): return [[c] * b for i in range(a)]
def list3d(a, b, c, d): return [[[d] * c for j in range(b)] for i in range(a)]
def list4d(a, b, c, d, e): return [[[[e] * d for j in range(c)] for j in range(b)] for i in range(a)]
def ceil(x, y=1): return int(-(-x // y))
def INT(): return int(input())
def MAP(): return map(int, input().split())
def LIST(N=None): return list(MAP()) if N is None else [INT() for i in range(N)]
def Yes(): print('Yes')
def No(): print('No')
def YES(): print('YES')
def NO(): print('NO')
sys.setrecursionlimit(10 ** 9)
INF = 10 ** 19
MOD = 10 ** 9 + 7

def build_grid(H, W, intv, _type, space=True, padding=False):
    # 入力がスペース区切りかどうか
    if space:
        _input = lambda: input().split()
    else:
        _input = lambda: input()
    _list = lambda: list(map(_type, _input()))
    # 余白の有無
    if padding:
        offset = 1
    else:
        offset = 0
    grid = list2d(H+offset*2, W+offset*2, intv)
    for i in range(offset, H+offset):
        row = _list()
        for j in range(offset, W+offset):
            grid[i][j] = row[j-offset]
    return grid

def bfs(grid, src):
    """ BFS(グリッド、重みなし) """
    from collections import deque

    H, W = len(grid), len(grid[0])
    directions = ((1, 0), (-1, 0), (0, 1), (0, -1))
    dist = list2d(H, W, INF)
    que = deque()
    for h, w in src:
        que.append((h, w))
        dist[h][w] = 0
    while que:
        h, w = que.popleft()
        for dh, dw in directions:
            for k in range(1, K+1):
                h2 = h + dh*k
                w2 = w + dw*k
                if grid[h2][w2] == '@':
                    break
                # 枝刈り
                if dist[h2][w2] < dist[h][w] + 1:
                    break
                elif dist[h2][w2] == dist[h][w] + 1:
                    continue
                else:
                    dist[h2][w2] = dist[h][w] + 1
                    que.append((h2, w2))
    return dist

H, W, K = MAP()
x1, y1, x2, y2 = MAP()
grid = build_grid(H, W, '@', str, space=0, padding=1)

res = bfs(grid, [(x1, y1)])
ans = res[x2][y2]
if ans == INF:
    print(-1)
else:
    print(ans)

Submission status: Accepted

Solution code:
from collections import*
z,v,a=input,range,print
h,w,k=map(int,z().split());r,s,t,u=map(lambda x:int(x)-1,z().split())
b=[z()for _ in v(h)];l=[[-1]*w for _ in v(h)];l[r][s]=0
d=deque([(r,s)])
while d:
  x,y=d.popleft();j=l[x][y]
  if(x==t)&(y==u):exit(a(j))
  for e,f in[[1,0],[-1,0],[0,-1],[0,1]]:
    for i in v(1,k+1):
      p,q=x+e*i,y+f*i
      if not((0<=p<h)&(0<=q<w))or b[p][q]=="@" or 0<=l[p][q]<=j:break
      if l[p][q]<0:d+=[(p,q)];l[p][q]=j+1
a(-1)

Submission status: Accepted

Solution code:
import math
#import numpy as np
import queue
from collections import deque,defaultdict
import heapq as hpq
from sys import stdin,setrecursionlimit
#from scipy.sparse.csgraph import dijkstra
#from scipy.sparse import csr_matrix
ipt = stdin.readline
setrecursionlimit(10**7)

def main():
    h,w,k = map(int,ipt().split())
    x1,y1,x2,y2 = map(int,ipt().split())
    x1 -= 1; y1 -= 1; x2 -= 1; y2 -= 1
    ms = [input()+"@" for _ in range(h)]
    ms.append("@"*(w+1))
    hq = []
    al = [[10**18]*w for _ in range(h)]
    al[x1][y1] = 0
    dr = [(0,1),(1,0),(0,-1),(-1,0)]
    hpq.heappush(hq,(0,x1,y1))
    while hq:
        c,x,y = hpq.heappop(hq)
        cn = c+1
        if x == x2 and y == y2:
            print(c)
            exit()
        for dx,dy in dr:
            xx = x
            yy = y
            for i in range(k):
                xx += dx
                yy += dy
                if ms[xx][yy] == ".":
                    if al[xx][yy] > cn:
                        al[xx][yy] = cn
                        hpq.heappush(hq,(cn,xx,yy))
                    elif al[xx][yy] == cn:
                        continue
                    else:
                        break
                else:
                    break
    print(-1)

    return

if __name__ == '__main__':
    main()

Submission status: Accepted

Solution code:
from collections import deque

H, W, K = map(int, input().split())
sx, sy, tx, ty = map(lambda a: int(a) - 1, input().split())
INF = 10**18

A = [input() for _ in range(H)]

minDist = [[INF] * W for _ in range(H)]
minDist[sx][sy] = 0
que = deque([(0, sx, sy)])

while que:
    dist, nx, ny = que.popleft()
    if nx == tx and ny == ty:
        break

    for i in range(1, K + 1):
        if nx + i >= H:
            break
        if minDist[nx + i][ny] <= dist or A[nx + i][ny] == '@':
            break
        if minDist[nx + i][ny] > dist + 1:
            minDist[nx + i][ny] = dist + 1
            que.append((dist + 1, nx + i, ny))
    for i in range(1, K + 1):
        if nx - i < 0:
            break
        if minDist[nx - i][ny] <= dist or A[nx - i][ny] == '@':
            break
        if minDist[nx - i][ny] > dist + 1:
            minDist[nx - i][ny] = dist + 1
            que.append((dist + 1, nx - i, ny))
    for i in range(1, K + 1):
        if ny + i >= W:
            break
        if minDist[nx][ny + i] <= dist or A[nx][ny + i] == '@':
            break
        if minDist[nx][ny + i] > dist + 1:
            minDist[nx][ny + i] = dist + 1
            que.append((dist + 1, nx, ny + i))
    for i in range(1, K + 1):
        if ny - i < 0:
            break
        if minDist[nx][ny - i] <= dist or A[nx][ny - i] == '@':
            break
        if minDist[nx][ny - i] > dist + 1:
            minDist[nx][ny - i] = dist + 1
            que.append((dist + 1, nx, ny - i))

ans = minDist[tx][ty]
print(ans if ans < INF else -1)

Submission status: Accepted

Solution code:
from collections import*
z,v,a=input,range,print
h,w,k=map(int,z().split());r,s,t,u=map(lambda x:int(x)-1,z().split())
b=[z()for _ in v(h)];l=[[-1]*w for _ in v(h)];l[r][s]=0
d=deque([(r,s)])
while d:
  x,y=d.popleft()
  if(x==t)&(y==u):exit(a(l[x][y]))
  for e,f in[[1,0],[-1,0],[0,-1],[0,1]]:
    for i in v(1,k+1):
      p,q=x+e*i,y+f*i
      if not((0<=p<h)&(0<=q<w))or b[p][q]=="@" or 0<=l[p][q]<=l[x][y]:break
      if l[p][q]<0:d+=[(p,q)];l[p][q]=l[x][y]+1
a(-1)

Submission status: Accepted

Solution code:
from collections import deque
import sys
input = sys.stdin.buffer.readline

H, W, K = map(int, input().split())
sx, sy, tx, ty = map(lambda a: int(a) - 1, input().split())
INF = 10**18

A = [input().decode() for _ in range(H)]

minDist = [[INF] * W for _ in range(H)]
minDist[sx][sy] = 0
que = deque([(0, sx, sy)])

while que:
    dist, nx, ny = que.popleft()

    for i in range(1, K + 1):
        if nx + i >= H:
            break
        if minDist[nx + i][ny] <= dist or A[nx + i][ny] == '@':
            break
        if minDist[nx + i][ny] > dist + 1:
            minDist[nx + i][ny] = dist + 1
            que.append((dist + 1, nx + i, ny))
    for i in range(1, K + 1):
        if nx - i < 0:
            break
        if minDist[nx - i][ny] <= dist or A[nx - i][ny] == '@':
            break
        if minDist[nx - i][ny] > dist + 1:
            minDist[nx - i][ny] = dist + 1
            que.append((dist + 1, nx - i, ny))
    for i in range(1, K + 1):
        if ny + i >= W:
            break
        if minDist[nx][ny + i] <= dist or A[nx][ny + i] == '@':
            break
        if minDist[nx][ny + i] > dist + 1:
            minDist[nx][ny + i] = dist + 1
            que.append((dist + 1, nx, ny + i))
    for i in range(1, K + 1):
        if ny - i < 0:
            break
        if minDist[nx][ny - i] <= dist or A[nx][ny - i] == '@':
            break
        if minDist[nx][ny - i] > dist + 1:
            minDist[nx][ny - i] = dist + 1
            que.append((dist + 1, nx, ny - i))

ans = minDist[tx][ty]
print(ans if ans < INF else -1)

Submission status: Accepted

Solution code:
import math
#import numpy as np
import queue
from collections import deque,defaultdict
import heapq as hpq
from sys import stdin,setrecursionlimit
#from scipy.sparse.csgraph import dijkstra
#from scipy.sparse import csr_matrix
ipt = stdin.readline
setrecursionlimit(10**7)

def main():
    h,w,k = map(int,ipt().split())
    x1,y1,x2,y2 = map(int,ipt().split())
    x1 -= 1; y1 -= 1; x2 -= 1; y2 -= 1
    ms = [input()+"@" for _ in range(h)]
    ms.append("@"*(w+1))
    hq = []
    al = [[10**18]*w for _ in range(h)]
    al[x1][y1] = 0
    dr = [(0,1),(1,0),(0,-1),(-1,0)]
    hpq.heappush(hq,(0,x1,y1))
    while hq:
        c,x,y = hpq.heappop(hq)
        cn = c+1
        if x == x2 and y == y2:
            print(c)
            exit()
        for dx,dy in dr:
            xx = x
            yy = y
            for i in range(k):
                xx += dx
                yy += dy
                if ms[xx][yy] == "." and al[xx][yy] > cn:
                    al[xx][yy] = cn
                    hpq.heappush(hq,(cn,xx,yy))
                elif ms[xx][yy] == "." and al[xx][yy] == cn:
                    continue
                else:
                    break
    print(-1)

    return

if __name__ == '__main__':
    main()

Submission status: Accepted

Solution code:
from collections import deque

H, W, K = map(int, input().split())
sx, sy, tx, ty = map(lambda a: int(a) - 1, input().split())
INF = 10**18

A = [input() for _ in range(H)]

minDist = [[INF] * W for _ in range(H)]
minDist[sx][sy] = 0
que = deque([(0, sx, sy)])

while que:
    dist, nx, ny = que.popleft()

    for i in range(1, K + 1):
        if nx + i >= H:
            break
        if minDist[nx + i][ny] <= dist or A[nx + i][ny] == '@':
            break
        if minDist[nx + i][ny] > dist + 1:
            minDist[nx + i][ny] = dist + 1
            que.append((dist + 1, nx + i, ny))
    for i in range(1, K + 1):
        if nx - i < 0:
            break
        if minDist[nx - i][ny] <= dist or A[nx - i][ny] == '@':
            break
        if minDist[nx - i][ny] > dist + 1:
            minDist[nx - i][ny] = dist + 1
            que.append((dist + 1, nx - i, ny))
    for i in range(1, K + 1):
        if ny + i >= W:
            break
        if minDist[nx][ny + i] <= dist or A[nx][ny + i] == '@':
            break
        if minDist[nx][ny + i] > dist + 1:
            minDist[nx][ny + i] = dist + 1
            que.append((dist + 1, nx, ny + i))
    for i in range(1, K + 1):
        if ny - i < 0:
            break
        if minDist[nx][ny - i] <= dist or A[nx][ny - i] == '@':
            break
        if minDist[nx][ny - i] > dist + 1:
            minDist[nx][ny - i] = dist + 1
            que.append((dist + 1, nx, ny - i))

ans = minDist[tx][ty]
print(ans if ans < INF else -1)

Submission status: Accepted

Solution code:
z,v,a=input,range,print
h,w,k=map(int,z().split())
r,s,t,u=map(lambda x:int(x)-1,z().split())
b=[z()for _ in v(h)]
l=[[-1]*w for _ in v(h)]
l[r][s]=0
from collections import*
d=deque([(r,s)])
while d:
  x,y=d.popleft()
  if(x==t)&(y==u):exit(a(l[x][y]))
  for e,f in[[1,0],[-1,0],[0,-1],[0,1]]:
    for i in v(1,k+1):
      p,q=x+e*i,y+f*i
      if not((0<=p<h)&(0<=q<w))or b[p][q]=="@" or 0<=l[p][q]<=l[x][y]:break
      if l[p][q]<0:d+=[(p,q)];l[p][q]=l[x][y]+1
a(-1)

Submission status: Accepted

Solution code:
z,v,a=input,range,print
h,w,k=map(int,z().split())
r,s,t,u=map(lambda x:int(x)-1,z().split())
b=[z()for _ in v(h)]
l=[[-1]*w for _ in v(h)]
l[r][s]=0
from collections import*
d=deque([(r,s)])
while d:
  x,y=d.popleft()
  if(x==t)&(y==u):exit(a(l[x][y]))
  for e,f in[[1,0],[-1,0],[0,-1],[0,1]]:
    for i in v(1,k+1):
      p,q=x+e*i,y+f*i
      if not((0<=p<h)&(0<=q<w))or b[p][q]=="@" or 0<=l[p][q]<=l[x][y]:break
      if l[p][q]==-1:d+=[(p,q)];l[p][q]=l[x][y]+1
a(-1)

Submission status: Accepted

Solution code:
h,w,k=map(int,input().split())
r,s,t,u=map(lambda x:int(x)-1,input().split())
b=[input()for _ in range(h)]
l=[[-1]*w for _ in range(h)]
l[r][s]=0
from collections import*
d=deque([(r,s)])
while d:
  x,y=d.popleft()
  if(x==t)&(y==u):exit(print(l[x][y]))
  for e,f in[[1,0],[-1,0],[0,-1],[0,1]]:
    for i in range(1,k+1):
      p,q=x+e*i,y+f*i
      if not((0<=p<h)&(0<=q<w))or b[p][q]=="@" or 0<=l[p][q]<=l[x][y]:break
      if l[p][q]==-1:d+=[(p,q)];l[p][q]=l[x][y]+1
print(-1)

Submission status: Accepted

Solution code:
h,w,k=map(int,input().split())
r,s,t,u=map(lambda x:int(x)-1,input().split())
b=[input()for _ in range(h)]
l=[[-1]*w for _ in range(h)]
l[r][s]=0
from collections import*
d=deque([(r,s)])
while d:
  x,y=d.popleft()
  if(x==t)&(y==u):exit(print(l[x][y]))
  for e,f in[[1,0],[-1,0],[0,-1],[0,1]]:
    for i in range(1,k+1):
      p,q=x+e*i,y+f*i
      if not((0<=p<h)&(0<=q<w))or b[p][q]=="@":break
      if 0<=l[p][q]<=l[x][y]:break
      if l[p][q]==-1:d+=[(p,q)];l[p][q]=l[x][y]+1
print(-1)

Submission status: Accepted

Solution code:
h,w,k=map(int,input().split())
r,s,t,u=map(lambda x:int(x)-1,input().split())
b=[input()for _ in range(h)]
l=[[-1]*w for _ in range(h)]
l[r][s]=0
from collections import*
d=deque([(r,s)])
while d:
  x,y=d.popleft()
  if(x==t)&(y==u):exit(print(l[x][y]))
  for e,f in [[1,0],[-1,0],[0,-1],[0,1]]:
    for i in range(1,k+1):
      p,q=x+e*i,y+f*i
      if not(0<=p<h and 0<=q<w)or b[p][q]=="@":break
      if 0<=l[p][q]<=l[x][y]:break
      if l[p][q]==-1:d+=[(p,q)]
      l[p][q]=l[x][y]+1
print(-1)

Submission status: Accepted

Solution code:
import sys
read = sys.stdin.read
readline = sys.stdin.buffer.readline
from collections import deque
INF = float('inf')


def main():
    H, W, K = map(int, readline().split())
    x1, y1, x2, y2 = map(int, readline().split())
    x1 -= 1
    y1 -= 1
    x2 -= 1
    y2 -= 1
    C = read().split()

    dist = [[INF] * W for i in range(H)]
    dist[x1][y1] = 0
    d = deque([[x1, y1]])
    dxy = [[1, 0], [0, 1], [-1, 0], [0, -1]]
    while d:
        x, y = d.popleft()
        if (x, y) == (x2, y2):
            print(dist[x][y])
            quit()
        for dx, dy in dxy:
            xx = x
            yy = y
            for i in range(K):
                xx += dx;
                yy += dy
                if 0 <= xx < H and 0 <= yy < W and C[xx][yy] != '@':
                    if dist[xx][yy] <= dist[x][y]:
                        break
                    if dist[xx][yy] == INF:
                        d.append([xx, yy])
                    dist[xx][yy] = dist[x][y] + 1
                else:
                    break

    print(-1)


if __name__ == '__main__':
    main()