View Compilation Error

0_0_6499709_4665.cpp:1:16: stdio: No such file or directory
0_0_6499709_4665.cpp: In function `LL dfs(int, int, int, int)':
0_0_6499709_4665.cpp:22: error: `ll' undeclared (first use this function)
0_0_6499709_4665.cpp:22: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6499709_4665.cpp:22: error: expected `;' before "ans"
0_0_6499709_4665.cpp:25: error: `ans' undeclared (first use this function)
0_0_6499709_4665.cpp: In function `int main()':
0_0_6499709_4665.cpp:46: error: `scanf' undeclared (first use this function)
0_0_6499709_4665.cpp:49: error: `printf' undeclared (first use this function)