foo.c: In function 'main':
foo.c:8:15: warning: 'm' may be used uninitialized [-Wmaybe-uninitialized]
    8 |          for(j=m-n;j>=0;j--,i++)
      |              ~^~~~
foo.c:3:12: note: 'm' was declared here
    3 | {int n,i=0,m,j=0;
      |            ^

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