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View Compilation Error

0_0_27579813_28980.cpp: In function 'void dfs(int, int)':
0_0_27579813_28980.cpp:49:22: error: expected primary-expression before '<' token
             rot[x]=x;<span style="white-space:pre"> </span>// 将该点还原,以找到下一个该点的可能落脚点,以确保可以考虑到所有的可能  
                      ^
0_0_27579813_28980.cpp:49:23: error: 'span' was not declared in this scope
             rot[x]=x;<span style="white-space:pre"> </span>// 将该点还原,以找到下一个该点的可能落脚点,以确保可以考虑到所有的可能  
                       ^


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