foo.c: In function 'init':
foo.c:11:1: warning: control reaches end of non-void function [-Wreturn-type]
   11 | }
      | ^
foo.c: In function 'main':
foo.c:46:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   46 |     scanf("%d %d %d",&n,&m,&p);
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~
foo.c:50:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   50 |         scanf("%d %d",&u,&v);
      |         ^~~~~~~~~~~~~~~~~~~~
foo.c:56:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   56 |         scanf("%d %d",&h,&l);
      |         ^~~~~~~~~~~~~~~~~~~~

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