View Compilation Error

0_0_10561244_29523.cpp:10: error: expected constructor, destructor, or type conversion before '<' token
0_0_10561244_29523.cpp:10: error: expected `,' or `;' before '<' token
0_0_10561244_29523.cpp: In function `void contract(int, int, int)':
0_0_10561244_29523.cpp:57: error: `Q' undeclared (first use this function)
0_0_10561244_29523.cpp:57: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_10561244_29523.cpp: In function `bool dfs(int, int)':
0_0_10561244_29523.cpp:65: error: `Q' undeclared (first use this function)