0_0_11319399_12840.cpp: In function `void visit(node*)':
0_0_11319399_12840.cpp:30: error: `find' undeclared (first use this function)
0_0_11319399_12840.cpp:30: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_11319399_12840.cpp: In function `int main()':
0_0_11319399_12840.cpp:53: error: `find' undeclared (first use this function)
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