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1ï¼â tmp = 1
â¡ p[j]
⢠p[r] = i
⣠p[j] + p[k]ï¼æp[k] + p[j]ï¼
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2ï¼â num <= 2ï¼ænum < 3 ænum == 2ï¼
â¡ go(LEFT_TO_RIGHT)
⢠pos[i] == LEFTï¼æLEFT == pos[i]ï¼
⣠time[i] + go(RIGHT_TO_LEFT)ï¼ægo(RIGHT_TO_LEFT) + time[i]ï¼
⤠pos[i] = LEFT
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