View Compilation Error

0_0_14498309_12187.cpp: In function 'int main()':
0_0_14498309_12187.cpp:91:43: error: lvalue required as left operand of assignment
                         (ll)dp[k][num][j] += dp[k-1][i][j], dp[k][num][j] %= mod;
                                           ^
0_0_14498309_12187.cpp:93:43: error: lvalue required as left operand of assignment
                         (ll)dp[k][i][num] += dp[k-1][i][j], dp[k][i][num] %= mod;
                                           ^