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59. 螺旋矩阵 II

class Solution {
   public:    vector
   
    
     > generateMatrix(int n) {
   	vector
     
      
       > ans(n, vector
       
        (n));	if (n == 0) return ans;	int num = 1;	int l = 0;	int u = 0;	int d = n - 1;	int r = n - 1;	while (1)	{
   		for (int i = l; i <= r; ++i)		{
   			ans[u][i] = num;			++num;		}		if (++u > d)  break;		for (int i = u; i <= d; ++i)		{
   			ans[i][r] = num;			++num;		}		if (--r < l)  break;		for (int i = r; i >= l; --i)		{
   			ans[d][i] = num;			++num;		}		if (--d< u)  break;		for (int i = d; i >= u; --i)		{
   			ans[i][l] = num;			++num;		}		if (++l >r)  break;	}	return ans;    }};
       
      
     
    
   

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