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View Compilation Error

0_0_14583829_31748.cpp:14:21: error: expected ']' before ';' token
 long long num[2*maxn;
                     ^
0_0_14583829_31748.cpp: In function 'void dfs(int, int)':
0_0_14583829_31748.cpp:26:5: error: 'num' was not declared in this scope
     num[st]++;
     ^
0_0_14583829_31748.cpp: In function 'int main()':
0_0_14583829_31748.cpp:45:15: error: 'num' was not declared in this scope
        memset(num,0,sizeof(num));
               ^


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