0_0_2350223_22725.cpp: In function `void dfs(int, int, int, int)':
0_0_2350223_22725.cpp:8: error: `c' undeclared (first use this function)
0_0_2350223_22725.cpp:8: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2350223_22725.cpp:11: error: `r' undeclared (first use this function)
0_0_2350223_22725.cpp:13: error: `ans' undeclared (first use this function)
0_0_2350223_22725.cpp: In function `int main()':
0_0_2350223_22725.cpp:41: error: `c' undeclared (first use this function)
0_0_2350223_22725.cpp:44: error: `r' undeclared (first use this function)
0_0_2350223_22725.cpp:47: error: `ans' undeclared (first use this function)
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