foo.cc: In function 'int main()':
foo.cc:43:5: error: 'ds' has not been declared
   43 |     ds::ST<int, 300000> st(a, n);
      |     ^~
foo.cc:43:12: error: expected primary-expression before 'int'
   43 |     ds::ST<int, 300000> st(a, n);
      |            ^~~
foo.cc:51:45: error: 'st' was not declared in this scope; did you mean 's'?
   51 |             cout << ((a[y] - a[x-1] == 0 && st.RMQMIN(x, y) - a[x-1] == 0) ? "Yes" : "No") << '\n';
      |                                             ^~
      |                                             s
foo.cc:54:21: error: 'st' was not declared in this scope; did you mean 's'?
   54 |             int p = st.RMQMIN(x, y) - a[x-1];
      |                     ^~
      |                     s

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