pascal中shl的用法varn:longint;a:array[1..10]of longint;procedure dfs(level,can:longint);var\x05i,p,pos:longint;begin\x05if (level>n) then \x05begin\x05\x05for i:=1 to n do write(a[i]);\x05\x05writeln;\x05\x05exit;\x05end;\x05p:=not can and (1 shl
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