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View Compilation Error

0_0_27780098_17971.cpp: In function 'void pre()':
0_0_27780098_17971.cpp:15:21: error: 'memset' was not declared in this scope
  memset(C,0,sizeof C);
                     ^
0_0_27780098_17971.cpp: In function 'void dfs(long long int, long long int)':
0_0_27780098_17971.cpp:57:26: error: 'memset' was not declared in this scope
   memset(lnk,0,sizeof lnk);
                          ^
0_0_27780098_17971.cpp: In function 'int main()':
0_0_27780098_17971.cpp:75:28: error: 'memset' was not declared in this scope
   memset(head,0,sizeof head);
                            ^


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