0_0_1730799_11300.cpp: In function `void dfs1(int, int)':
0_0_1730799_11300.cpp:25: error: `dfs' undeclared (first use this function)
0_0_1730799_11300.cpp:25: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_1730799_11300.cpp: In function `void dfs(int, int)':
0_0_1730799_11300.cpp:30: error: `void dfs(int, int)' used prior to declaration
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