target = 4
n = (target * 2) - 1
matrix = [[0] * n for _ in range(n)]
x, u, d, l, r = 1, 0, n - 1, 0, n - 1
c = target
while l < r and u < d:
for j in range(l, r):
matrix[u][j] = c
for i in range(u, d):
matrix[i][r] = c
for j in range(r, l, -1):
matrix[d][j] = c
for i in range(d, u, -1):
matrix[i][l] = c
u, d, l, r, c = u + 1, d - 1, l + 1, r - 1, c - 1
if l == r:
matrix[u][r] = c
print(matrix)
{"html5":"htmlmixed","css":"css","javascript":"javascript","php":"php","python":"python","ruby":"ruby","lua":"text\/x-lua","bash":"text\/x-sh","go":"go","c":"text\/x-csrc","cpp":"text\/x-c++src","diff":"diff","latex":"stex","sql":"sql","xml":"xml","apl":"apl","asterisk":"asterisk","c_loadrunner":"text\/x-csrc","c_mac":"text\/x-csrc","coffeescript":"text\/x-coffeescript","csharp":"text\/x-csharp","d":"d","ecmascript":"javascript","erlang":"erlang","groovy":"text\/x-groovy","haskell":"text\/x-haskell","haxe":"text\/x-haxe","html4strict":"htmlmixed","java":"text\/x-java","java5":"text\/x-java","jquery":"javascript","mirc":"mirc","mysql":"sql","ocaml":"text\/x-ocaml","pascal":"text\/x-pascal","perl":"perl","perl6":"perl","plsql":"sql","properties":"text\/x-properties","q":"text\/x-q","scala":"scala","scheme":"text\/x-scheme","tcl":"text\/x-tcl","vb":"text\/x-vb","verilog":"text\/x-verilog","yaml":"text\/x-yaml","z80":"text\/x-z80"}
