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#define ABS(v) ((v) - ((v) >> sizeof(v) * CHAR_BIT - 1)) \
-((v) >> sizeof(v) * CHAR_BIT - 1)
#define ABS(v) ((v) - ((v) >> sizeof(int) * CHAR_BIT - 1)) \
-((v) >> sizeof(int) * CHAR_BIT - 1)
#define ABS(v) ((v) - ((v) >> sizeof(int) * CHAR_BIT - 1)) \
-((v) >> sizeof(int) * CHAR_BIT - 1)