0_0_21844492_29009.cpp: In function 'int work(int)':
0_0_21844492_29009.cpp:66:28: error: 'memset' was not declared in this scope
memset(DFN, 0, sizeof(DFN));
^
0_0_21844492_29009.cpp: In function 'int main()':
0_0_21844492_29009.cpp:91:31: error: 'memset' was not declared in this scope
memset(head, -1, sizeof(head));
^
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