0_0_4023980_15688.cpp: In function `int main(int, char**)':
0_0_4023980_15688.cpp:65: error: `Hopcroft_KarpBFS' undeclared (first use this function)
0_0_4023980_15688.cpp:65: error: (Each undeclared identifier is reported only once for each function it appears in.)
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