View Compilation Error

0_0_3912098_11170.cpp: In function `void dp(int, int&, int&)':
0_0_3912098_11170.cpp:35: error: `bn' undeclared (first use this function)
0_0_3912098_11170.cpp:35: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_3912098_11170.cpp:35: error: expected `;' before '}' token