0_0_20784004_11812.cpp: In function 'int main()':
0_0_20784004_11812.cpp:69:32: error: 'memset' was not declared in this scope
memset(head, -1, sizeof(head));
^
0_0_20784004_11812.cpp:81:24: error: 'sort' was not declared in this scope
sort(speed, speed + m);
^
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