src.cpp: In function 'void nhap()':
src.cpp:12:21: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
a[y].push_back[x];
^
src.cpp:13:21: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
a[x].push_back[y];
^
src.cpp: In function 'void BFS(int)':
src.cpp:23:5: error: expected ';' before 'for'
for (i=0;int v=a[u][i];i++)
^
src.cpp:23:31: error: expected ';' before ')' token
for (i=0;int v=a[u][i];i++)
^