foo.c: In function 'div':
foo.c:28:9: warning: this 'while' clause does not guard... [-Wmisleading-indentation]
   28 |         while (f[i]!=f[j])
      |         ^~~~~
foo.c:30:17: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'while'
   30 |                 if (j>1000)
      |                 ^~

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