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View Compilation Error

0_0_37609746_22048.cpp: In function 'int main()':
0_0_37609746_22048.cpp:51:25: error: expected primary-expression before '<' token
                 Find(a);<span style="white-space:pre">   //还需自己把a到它的根节点的每个节点的under更新一下</span>
                         ^
0_0_37609746_22048.cpp:51:26: error: 'span' was not declared in this scope
                 Find(a);<span style="white-space:pre">   //还需自己把a到它的根节点的每个节点的under更新一下</span>
                          ^


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