View Compilation Error

0_0_2191045_26121.cpp: In function `void init()':
0_0_2191045_26121.cpp:10: error: `r' undeclared (first use this function)
0_0_2191045_26121.cpp:10: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2191045_26121.cpp:11: error: `c' undeclared (first use this function)
0_0_2191045_26121.cpp: In function `void dfs(int, int, int)':
0_0_2191045_26121.cpp:49: error: `r' undeclared (first use this function)
0_0_2191045_26121.cpp:49: error: `c' undeclared (first use this function)
0_0_2191045_26121.cpp: In function `int main()':
0_0_2191045_26121.cpp:72: error: `r' undeclared (first use this function)
0_0_2191045_26121.cpp:72: error: `c' undeclared (first use this function)