0_0_21313015_29177.cpp: In function 'void init()':
0_0_21313015_29177.cpp:12:31: error: 'memset' was not declared in this scope
memset(head, -1, sizeof(head));
^
0_0_21313015_29177.cpp: In function 'int main()':
0_0_21313015_29177.cpp:54:30: error: 'memset' was not declared in this scope
memset(vis, 0, sizeof(vis));
^
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