0_0_35337232_16992.cpp: In function 'void dfs(long long int, long long int)':
0_0_35337232_16992.cpp:67:9: error: 'fa' was not declared in this scope
fa[v][0]=u;
^
0_0_35337232_16992.cpp: In function 'int main()':
0_0_35337232_16992.cpp:126:9: error: 'fa' was not declared in this scope
fa[1][0]=1;
^
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