0_0_36493936_6231.cpp: In function 'int dfs1(int, int)':
0_0_36493936_6231.cpp:13:9: error: return-statement with no value, in function returning 'int' [-fpermissive]
return ;
^
0_0_36493936_6231.cpp:17:5: error: return-statement with no value, in function returning 'int' [-fpermissive]
return ;
^
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