1 x d: ax:=da_{x} := dax:=d 2 l r: 输出mini=lrai\min^{r}_{i = l} a_{i}mini=lrai 3 l r: 输出maxi=lrai\max^{r}_{i = l} a_{i}maxi=lrai
1 x d
2 l r
3 l r
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