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03-2.jl
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03-2.jl
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import Base.print_matrix
result = 0
function neighbor_sum(grid, x, y)
global result
sum = grid[x-1, y-1]+grid[x, y-1]+grid[x+1, y-1]+grid[x-1, y]+grid[x+1, y]+grid[x-1, y+1]+grid[x, y+1]+grid[x+1, y+1]
if sum >= target && result == 0
result = sum
end
return sum
end
function main()
matrix_dims::Int = 13
grid = zeros(Int, matrix_dims, matrix_dims)
x::Int = ceil(matrix_dims/2)
y::Int = ceil(matrix_dims/2)
grid[x, y] = 1
round = 1
y += 1
while y < matrix_dims
# go up
for i in 1:(2*round-1)
grid[x, y] = neighbor_sum(grid, x, y)
x -= 1
end
# go left
for i in 1:(2*round)
grid[x, y] = neighbor_sum(grid, x, y)
y -= 1
end
# go down
for i in 1:(2*round)
grid[x, y] = neighbor_sum(grid, x, y)
x += 1
end
# go right
for i in 1:(2*round+1)
grid[x, y] = neighbor_sum(grid, x, y)
y += 1
end
round += 1
end
# uncomment to print the whole thing
#print_matrix(STDOUT, grid[2:(size(grid,1)-1), 2:(size(grid,2)-1)]);println()
end
f = open("03-input.txt")
target = parse(Int, readstring(f))
main()
println("First number bigger than target ($target) is $result")