View Compilation Error

0_0_38781062_12003.cpp: In function 'void solve()':
0_0_38781062_12003.cpp:18:10: error: 'a' was not declared in this scope
   18 |     cin>>a>>b;
      |          ^
0_0_38781062_12003.cpp:18:13: error: 'b' was not declared in this scope
   18 |     cin>>a>>b;
      |             ^