0_0_24489433_29531.cpp: In function 'int main()': 0_0_24489433_29531.cpp:35:46: error: 'iid' was not declared in this scope dp[i&255][j][0]=max(dp[i+j&255][j][1],dp[iid+j+1&255][j+1][1]+a[i+j])+b[i+j-1]-b[i-1]; ^