foo.c: In function 'main':
foo.c:5:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&m,&n);
  ^~~~~~~~~~~~~~~~~~~
foo.c:9:4: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d",&a[i][j]);
    ^~~~~~~~~~~~~~~~~~~~
foo.c:20:65: warning: array subscript is below array bounds [-Warray-bounds]
     if(j==n-1&&a[i][j]>a[i][j-1]&&a[i][j]>a[i+1][j-1]&&a[i][j]>a[i-1][j])
                                                                ~^~~~~

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