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Hiko Seijuurou is looking for a suitable training ground for his students. He has a found a suitably perilous terrain of Mร—N๐‘€ร—๐‘ cells. aij๐‘Ž๐‘–๐‘— is the altitude of the cell on the i๐‘–-th row and the j๐‘—-th column.Seijuurou plans to drop students at any of the cells and ask them to visit at least K๐พ other cells. A student with capability c๐‘ can only move to an adjacent cell (up/down/right/left) if the absolute difference in altitude between the two cells is at most c๐‘.For each cell, find the minimum capability a student needs to have to visit at least K๐พ other cells if they start at this cell.InputThree integers M,N,K๐‘€,๐‘,๐พ on the first line.M๐‘€ lines follow with N๐‘ integers on each line. The j๐‘—-th integer on the (i+1)(๐‘–+1)-th line is aij๐‘Ž๐‘–๐‘—.Three integers M,N,K๐‘€,๐‘,๐พ on the first line.Constraints1โ‰คM,Nโ‰ค5001โ‰ค๐‘€,๐‘โ‰ค5000โ‰คKโ‰คMNโˆ’10โ‰ค๐พโ‰ค๐‘€๐‘โˆ’1โˆ’109โ‰คaijโ‰ค+109โˆ’109โ‰ค๐‘Ž๐‘–๐‘—โ‰ค+109OutputM๐‘€ lines with N๐‘ integers on each line. The j๐‘—-th integer on the i๐‘–-th line should be the minimum capability a student needs to have to visit at least K๐พ other cells if they start at cell (i,j)(๐‘–,๐‘—).Examplesinput2 2 1-3 -9-8 2output5 6 5 10 input5 7 67 6 -40 -11 -16 -28 -4737 -31 -19 -18 -13 -28 3414 -6 -46 0 -16 35 22-34 -23 -42 -40 -27 11 -439 5 -30 0 50 -32 0output30 30 21 11 11 12 19 23 12 11 11 11 12 38 20 19 13 16 11 38 38 19 19 13 13 11 38 43 28 28 13 30 50 43 43 NoteIn the first example, you need to reach only one other cell.From (1,1)(1,1), if you have 55 capability, you can reach cell (2,1)(2,1).From (1,2)(1,2), if you have 66 capability, you can reach cell (1,1)(1,1).From (2,1)(2,1), if you have 55 capability, you can reach cell (1,1)(1,1).From (2,2)(2,2), if you have 1010 capability, you can reach cell (2,1)(2,1).

Question

Hiko Seijuurou is looking for a suitable training ground for his students. He has a found a suitably perilous terrain of Mร—N๐‘€ร—๐‘ cells. aij๐‘Ž๐‘–๐‘— is the altitude of the cell on the i๐‘–-th row and the j๐‘—-th column.Seijuurou plans to drop students at any of the cells and ask them to visit at least K๐พ other cells. A student with capability c๐‘ can only move to an adjacent cell (up/down/right/left) if the absolute difference in altitude between the two cells is at most c๐‘.For each cell, find the minimum capability a student needs to have to visit at least K๐พ other cells if they start at this cell.InputThree integers M,N,K๐‘€,๐‘,๐พ on the first line.M๐‘€ lines follow with N๐‘ integers on each line. The j๐‘—-th integer on the (i+1)(๐‘–+1)-th line is aij๐‘Ž๐‘–๐‘—.Three integers M,N,K๐‘€,๐‘,๐พ on the first line.Constraints1โ‰คM,Nโ‰ค5001โ‰ค๐‘€,๐‘โ‰ค5000โ‰คKโ‰คMNโˆ’10โ‰ค๐พโ‰ค๐‘€๐‘โˆ’1โˆ’109โ‰คaijโ‰ค+109โˆ’109โ‰ค๐‘Ž๐‘–๐‘—โ‰ค+109OutputM๐‘€ lines with N๐‘ integers on each line. The j๐‘—-th integer on the i๐‘–-th line should be the minimum capability a student needs to have to visit at least K๐พ other cells if they start at cell (i,j)(๐‘–,๐‘—).Examplesinput2 2 1-3 -9-8 2output5 6 5 10 input5 7 67 6 -40 -11 -16 -28 -4737 -31 -19 -18 -13 -28 3414 -6 -46 0 -16 35 22-34 -23 -42 -40 -27 11 -439 5 -30 0 50 -32 0output30 30 21 11 11 12 19 23 12 11 11 11 12 38 20 19 13 16 11 38 38 19 19 13 13 11 38 43 28 28 13 30 50 43 43 NoteIn the first example, you need to reach only one other cell.From (1,1)(1,1), if you have 55 capability, you can reach cell (2,1)(2,1).From (1,2)(1,2), if you have 66 capability, you can reach cell (1,1)(1,1).From (2,1)(2,1), if you have 55 capability, you can reach cell (1,1)(1,1).From (2,2)(2,2), if you have 1010 capability, you can reach cell (2,1)(2,1).

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Solution

This problem is a search problem that can be solved using binary search and breadth-first search (BFS) algorithms. Here are the steps to solve it:

  1. Initialize the minimum and maximum capability as the minimum and maximum altitude difference in the terrain respectively.

  2. Perform a binary search between the minimum and maximum capability. For each capability 'c' in the binary search:

    a. For each cell in the terrain, perform a BFS starting from this cell. In the BFS, a student can move to an adjacent cell if the absolute difference in altitude between the current cell and the adjacent cell is less than or equal to 'c'.

    b. If there are at least 'K' cells that can be visited from the current cell, then update the maximum capability as 'c'. Otherwise, update the minimum capability as 'c' + 1.

  3. The minimum capability for each cell is the minimum 'c' such that there are at least 'K' cells that can be visited from this cell.

This algorithm ensures that the minimum capability for each cell is found in O(MNlog(max-min)) time, where 'max' and 'min' are the maximum and minimum altitude difference in the terrain respectively. This is because the binary search takes O(log(max-min)) time and the BFS takes O(M*N) time for each 'c' in the binary search.

This problem has been solved

Similar Questions

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During the morning assembly in a school, students stand in the playground in a fixed pattern of rows. Each row consists of students of only one particular class.1) There are four more rows of Class 10 students than of Class 5 students.2) The number of rows of Class 6 students is one less than of Class 10 students.3) One of the classes has the maximum number of rows, i.e., seven.4) There are two rows of Class 5 students.5) There are two more rows of Class 8 students than of Class 5 students.6) The number of rows of Class 9 students is less than that of Class 7 students.Analyze this information and answer the question given below.Which of the following is the total number of rows of Class 10 students? 4 5 6 7 8Mark for Later

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