../programs/61753.c: In function 'cmp':
../programs/61753.c:17: error: dereferencing pointer to incomplete type
../programs/61753.c:17: error: dereferencing pointer to incomplete type
../programs/61753.c:18: warning: control reaches end of non-void function
../programs/61753.c: In function 'main':
../programs/61753.c:77: warning: implicit declaration of function 'qsort'
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