0_0_6091615_21797.cpp: In function `void dfs(int, int, int)':
0_0_6091615_21797.cpp:11: error: `find' undeclared (first use this function)
0_0_6091615_21797.cpp:11: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6091615_21797.cpp: In function `int main()':
0_0_6091615_21797.cpp:53: error: `find' undeclared (first use this function)
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