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View Compilation Error

0_0_38318157_5371.cpp: In function 'll bsgs(ll, ll, ll, ll)':
0_0_38318157_5371.cpp:82:2: error: 'unordered_map' was not declared in this scope
  unordered_map<ll,ll> Hash;  
  ^
0_0_38318157_5371.cpp:82:18: error: expected primary-expression before ',' token
  unordered_map<ll,ll> Hash;  
                  ^
0_0_38318157_5371.cpp:82:21: error: expected primary-expression before '>' token
  unordered_map<ll,ll> Hash;  
                     ^
0_0_38318157_5371.cpp:82:23: error: 'Hash' was not declared in this scope
  unordered_map<ll,ll> Hash;  
                       ^


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