View Compilation Error

0_0_38979598_9484.cpp: In function 'void solve_2019CCPC_Hunan_E(long long int)':
0_0_38979598_9484.cpp:15:20: error: 'x' was not declared in this scope
   15 |         if (h.find(x) == h.end()) continue;
      |                    ^