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  1. #include<iostream>
  2. #define R 4
  3. #define C 4
  4. using namespace std;
  5. int main()
  6. {
  7.  
  8.     int mat[][C]={
  9.                   {1,2,3,4},
  10.                   {5,6,7,8},
  11.                   {9,10,11,12},
  12.                   {13,14,15,16}
  13.                  };
  14.  
  15.     int top=0;
  16.     int down=R-1;
  17.     int left=0;
  18.     int right=C-1;
  19.  
  20.     while(true)
  21.     {
  22.  
  23.         //print first row
  24.         for(int i=left;i<=right;++i) cout<<mat[top][i]<<" ";
  25.         top++;
  26.  
  27.         if(top>down || left>right) break;
  28.         //print last column
  29.         for(int i=top;i<=down;++i) cout<<mat[i][right]<<" ";
  30.         right--;
  31.  
  32.         if(top>down || left>right) break;
  33.         //print last row
  34.         for(int i=right;i>=left;--i) cout<<mat[down][i]<<" ";
  35.         down--;
  36.  
  37.         if(top>down || left>right) break;
  38.         //print first column
  39.         for(int i=down;i>=top;--i) cout<<mat[i][left]<<" ";
  40.         left++;
  41.         if(top>down || left>right) break;
  42.     }
  43.     return 0;
  44. }
Success #stdin #stdout 0s 3096KB
comments (?)
stdin 
Standard input is empty
stdout 
1 2 3 4 8 12 16 15 14 13 9 5 6 7 11 10
https://ideone.com/bt8A5O
Spiral traversal of matrix
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
secret

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