foo.cc: In function 'int print()':
foo.cc:31:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
foo.cc: In function 'int dfs(int, int)':
foo.cc:60:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

Found 5 testcases.
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