View Compilation Error

0_0_8564478_22416.cpp: In function `int main()':
0_0_8564478_22416.cpp:36: error: `n' undeclared (first use this function)
0_0_8564478_22416.cpp:36: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8564478_22416.cpp:40: error: `dp' undeclared (first use this function)
0_0_8564478_22416.cpp:41: error: `i' undeclared (first use this function)