0_0_21806570_23831.cpp: In function 'void init()':
0_0_21806570_23831.cpp:26:29: error: 'memset' was not declared in this scope
memset(head,-1,sizeof(head));
^
0_0_21806570_23831.cpp: In function 'int main()':
0_0_21806570_23831.cpp:100:28: error: 'memset' was not declared in this scope
memset(pre,-1,sizeof(pre));
^
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