foo.c: In function 'main':
foo.c:17:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &m, &n);
  ^~~~~~~~~~~~~~~~~~~~~
foo.c:20:4: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d", &x[i][j]);
    ^~~~~~~~~~~~~~~~~~~~~
foo.c:39:7: warning: 't1' may be used uninitialized in this function [-Wmaybe-uninitialized]
    if (t1 == m&&t2==n)end++;
       ^

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