Created
January 31, 2018 06:19
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Spiral matrix - peer mock
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using System; | |
class Solution | |
{ | |
public static List<int> Spiral(int[,] matrix) | |
{ | |
List<int> res = new List<int>(); | |
if(matrix==null) | |
return res; | |
int[,] dir = new int[4,2] {{0,1},{1,0},{0,-1},{-1,0} }; | |
int rows = matrix.GetLength(0); | |
int cols = matrix.GetLength(1); | |
if(rows ==0 || cols==0) | |
return res; | |
int top=0,bottom= rows-1,left=0,right=cols-1; | |
int total =rows*cols; | |
int k=0; | |
int x=0,y=0; | |
res.Add(matrix[x,y]); | |
total--; | |
while(total>0) | |
{ | |
int newX = x + dir[k,0]; | |
int newY = y + dir[k,1]; | |
//check valididty | |
if(newX >=top && newX <=bottom && newY >=left && newY <=right) | |
{ | |
x = newX; | |
y=newY; | |
res.Add(matrix[x,y]); | |
total--; | |
} | |
else | |
{ | |
switch(k) | |
{ | |
case 0: | |
top++; | |
break; | |
case 1: | |
right--; | |
break; | |
case 2: | |
bottom--; | |
break; | |
case 3: | |
left++; | |
break; | |
} | |
k = (k+1)%4; | |
} | |
return res; | |
} | |
} | |
static void Main(string[] args) | |
{ | |
for (var i = 0; i < 5; i++) | |
{ | |
Console.WriteLine("Hello, World"); | |
} | |
} | |
} |
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