foo.cc: In function 'int cou(int)':
foo.cc:13:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
foo.cc: In function 'int dfs(int, int)':
foo.cc:28:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^

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