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Lỗi biên dịch:

Main.c: In function ‘main’:
Main.c:87:3: error: expected declaration or statement at end of input
   printf("%d", sodong*socot);
   ^~~~~~
Main.c:56:6: warning: unused variable ‘cot’ [-Wunused-variable]
  int cot;
      ^~~
Main.c:24:7: warning: unused variable ‘dong’ [-Wunused-variable]
   int dong;
       ^~~~
Main.c:4:7: warning: unused variable ‘a’ [-Wunused-variable]
   int a[50][50],n,m,k;
       ^
Main.c:6:2: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d", &n, &m, &k);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.c:18:4: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d",&OD[i][j]);
    ^~~~~~~~~~~~~~~~~~~~~