View Compilation Error

0_0_5313916_591.cpp: In function `void dp1()':
0_0_5313916_591.cpp:49: error: `j' undeclared (first use this function)
0_0_5313916_591.cpp:49: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_5313916_591.cpp:49: error: `a' undeclared (first use this function)