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1. #define MIN(a,b) ((a)<(b)? (a) :(b))
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#define MIN(a,b) ({int x=(a), y=(b); (x)<(y)? (x) :(y);}) // ÓÃÁËgnuÀ©Õ¹
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void sort(st ut[], int count, BOOL (*cmp)(st , st ));
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