/in/foo.cc: In function 'int main()':
/in/foo.cc:14:93: error: lvalue required as left operand of assignment
    if (dp[(i - 1) & 1][j - 1] && (ll[i - 1] == rr[j - 1] || rr[j - 1] == '_' || rr[j - 1] = '%')) dp[i & 1][j] = true;
                                                                                             ^~~