Exec runs a command and returns its exit code:
1. 找出最大数，确定最大位数d
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Video evidence examined by the BBC reveals that 17-year-old Shreeyam Chaulagain - the youngest of the 19 victims - had been unarmed and was trying to leave the scene when he died.
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南方周末：那你在之后演奏肖邦时，脑子里还会浮现起比赛的场景以及随之而来的噪音吗？