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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.     //freopen("input.txt", "r", stdin);
  6.     //freopen("output.txt", "w", stdout);
  7.  
  8.     int r, c;
  9.     cin >> r >> c;
  10.     int r_beg = 0, r_end = r - 1, c_beg = 0, c_end = c - 1;
  11.  
  12.     int **m = new int*[r];
  13.  
  14.     for (int i = 0; i < r; i++)
  15.     {
  16.         m[i] = new int[c];
  17.         for (int j = 0; j < c; j++)
  18.         {
  19.             cin >> m[i][j];
  20.         }
  21.     }
  22.  
  23.     for (int runs = min(r, c);;)
  24.     {
  25.         for (int i = c_beg; i <= c_end; i++)
  26.             cout << " " << m[r_beg][i];
  27.         ++r_beg;    
  28.         for (int i = r_beg; i <= r_end; i++)
  29.             cout << " " << m[i][c_end];
  30.         --c_end;
  31.         if (!--runs) break;
  32.  
  33.         for (int i = c_end; i >= c_beg; i--)
  34.             cout << " " << m[r_end][i];
  35.         --r_end;
  36.         for (int i = r_end; i >= r_beg; i--)
  37.             cout << " " << m[i][c_beg];
  38.         ++c_beg;
  39.         if (!--runs) break;
  40.  
  41.     }
  42.  
  43.  
  44.     for (int i = 0; i < r; i++)
  45.         delete[] m[i];
  46.     delete[] m;
  47.  
  48.     return 0;
  49. }
Success #stdin #stdout 0s 4376KB
comments (?)
stdin
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3 7
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
stdout
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 1 2 3 4 5 6 7 14 21 20 19 18 17 16 15 8 9 10 11 12 13
https://ideone.com/I9tkud
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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