View Compilation Error

0_0_21757691_17391.cpp: In function 'int main()':
0_0_21757691_17391.cpp:64:63: error: lvalue required as left operand of assignment
                     dp[t][st[i]|j]=(dp[t][st[i]|j]+dp[t-1][j])%=mod;
                                                               ^
0_0_21757691_17391.cpp:76:85: error: lvalue required as left operand of assignment
                         dp[t][st[g[i][j]]|pre]=(dp[t][st[g[i][j]]|pre]+dp[t-1][pre])%=mod;
                                                                                     ^