foo.cc: In function 'bool shan(int (*)[500], int, int, int, int, int)':
foo.cc:17:2: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
  if(a[k1-1][k2]>x)
  ^~
foo.cc:19:3: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   k1=i,k2=j;
   ^~
foo.cc: In function 'int main()':
foo.cc:29:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d",&m,&n);
  ~~~~~^~~~~~~~~~~~~~~
foo.cc:32:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d",&a[i][j]);
    ~~~~~^~~~~~~~~~~~~~~

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