0_0_20644401_14320.cpp: In function 'void dfs(int, int)':
0_0_20644401_14320.cpp:25:22: error: expected primary-expression before '<' token
rot[x]=x;<span style="white-space:pre"> </span>// 灏嗚鐐硅繕鍘,浠ユ壘鍒颁笅涓涓鐐圭殑鍙兘钀借剼鐐,浠ョ‘淇濆彲浠ヨ冭檻鍒版墍鏈夌殑鍙兘
^
0_0_20644401_14320.cpp:25:23: error: 'span' was not declared in this scope
rot[x]=x;<span style="white-space:pre"> </span>// 灏嗚鐐硅繕鍘,浠ユ壘鍒颁笅涓涓鐐圭殑鍙兘钀借剼鐐,浠ョ‘淇濆彲浠ヨ冭檻鍒版墍鏈夌殑鍙兘
^
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