View Compilation Error

0_0_39489277_5997.cpp: In function 'void solve()':
0_0_39489277_5997.cpp:38:9: error: 'q' was not declared in this scope
   38 |         q.push(make_pair(0, 1));
      |         ^
0_0_39489277_5997.cpp: In function 'int main()':
0_0_39489277_5997.cpp:80:5: error: 'IOS' was not declared in this scope
   80 |     IOS;
      |     ^~~