View Compilation Error

0_0_4717305_11243.cpp: In function `void dfs(int, int)':
0_0_4717305_11243.cpp:54: error: `rotate' undeclared (first use this function)
0_0_4717305_11243.cpp:54: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4717305_11243.cpp: In function `void solve()':
0_0_4717305_11243.cpp:75: error: `rotate' undeclared (first use this function)