模板

1、螺旋矩阵求值（右上为1，往下走）

 1 long long f(long long n,long long x,long long y){
 2     x = n - x + 1;
 3     y = n - y + 1;
 4     long long  r = 0;
 5     if(x <= y & x + y <= n+1)
 6     {
 7         r = x;
 8         return  4*(r-1)*n - 4*(r-1)*(r-1) +1 + y-r;
 9     }
10     if(x<=y & x+y >= n+1)
11     {
12         r = n- y + 1;
13         return 4*(r-1)*n - 4*(r-1)*(r-1) + 1 + n-2*r + 1 + x - r;
14     }
15     if(x>=y & x+y >= n+1)
16     {
17         r = n - x +1;
18         return 4*(r-1)*n - 4*(r-1)*(r-1) + 1 + 3*n-6*r + 3 - y + r;
19     }
20     if(x>=y & x+y <= n+1)
21     {
22         r = y;
23         return 4*(r-1)*n - 4*(r-1)*(r-1) + 1 + 4*n-8*r + 4  - x + r;
24     }
25     return 0;
26 }

 

posted @ 2019-09-01 20:13  滚烫的青春  阅读(159)  评论(0)  编辑  收藏  举报