View Compilation Error

0_0_37988948_16045.cpp: In function 'int Dp(int)':
0_0_37988948_16045.cpp:102:5: error: 'len' was not declared in this scope
     len = 0;
     ^
0_0_37988948_16045.cpp:106:9: error: 'nums' was not declared in this scope
         nums[ ++ len] = n % B;
         ^
0_0_37988948_16045.cpp:106:29: error: 'B' was not declared in this scope
         nums[ ++ len] = n % B;
                             ^
0_0_37988948_16045.cpp: In function 'void solve()':
0_0_37988948_16045.cpp:114:17: error: 'B' was not declared in this scope
     cin >> k >> B >> d >> l >> r;
                 ^