/in/foo.cc: In function 'int main()':
/in/foo.cc:49:104: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   49 |             else (X[k] != 0 && j >= L[k] && j < R[k]) && (ans += ((i - X[k]) * (R[k] - j)) % mod, R[k] = j);
      |                                                                                                   ~~~~~^~~
/in/foo.cc:50:54: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   50 |             (X[k] == 0) && (X[k] = i, L[k] = j, R[k] = m + 1);
      |                                                 ~~~~~^~~~~~~