View Compilation Error

0_0_38979607_7676.cpp: In function 'void solve_2019CCPC_Hunan_E(long long int)':
0_0_38979607_7676.cpp:16:24: error: 'x' was not declared in this scope
   16 |             if (h.find(x) == h.end()) continue;
      |                        ^