0_0_7744197_26671.cpp: In function `int main()':
0_0_7744197_26671.cpp:409: error: `build_graph' undeclared (first use this function)
0_0_7744197_26671.cpp:409: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_7744197_26671.cpp:420: error: `min_cost_max_flow' undeclared (first use this function)
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