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<n;写成<n-1;当初想到哪里去了。。汗。。写成<n-1时，还以为是别处错了，又乱改了下，结果竟过了。。。。 又认真看下了，改下<n，把乱改的又改回来，又AC了。。 汗。。。 Followed by: Post your reply here: |
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