View Compilation Error

0_0_21279688_31385.cpp: In function 'int main()':
0_0_21279688_31385.cpp:37:67: error: expected ']' before ')' token
     dp[i][visit[sign]]=maxx(dp[i][visit[sign]],dp[(i^d[visit[sign])]][k]+a[k]*a[visit[sign]]);
                                                                   ^
0_0_21279688_31385.cpp:37:69: error: expected ')' before ']' token
     dp[i][visit[sign]]=maxx(dp[i][visit[sign]],dp[(i^d[visit[sign])]][k]+a[k]*a[visit[sign]]);
                                                                     ^