View Compilation Error

0_0_3053925_7883.cpp:1: error: invalid token
0_0_3053925_7883.cpp:1: error: expected constructor, destructor, or type conversion before '<' token
0_0_3053925_7883.cpp:1: error: expected `,' or `;' before '<' token
0_0_3053925_7883.cpp: In function `void dfs(int, int, int)':
0_0_3053925_7883.cpp:29: error: `printf' undeclared (first use this function)
0_0_3053925_7883.cpp:29: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_3053925_7883.cpp: In function `int main()':
0_0_3053925_7883.cpp:66: error: `scanf' undeclared (first use this function)
0_0_3053925_7883.cpp:66: error: `EOF' undeclared (first use this function)
0_0_3053925_7883.cpp:73: error: `qsort' undeclared (first use this function)
0_0_3053925_7883.cpp:76: error: `printf' undeclared (first use this function)