0_0_5480752_20579.cpp: In function `void merge(int, int)':
0_0_5480752_20579.cpp:30: error: `fx' undeclared (first use this function)
0_0_5480752_20579.cpp:30: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_5480752_20579.cpp:30: error: `fy' undeclared (first use this function)
0_0_5480752_20579.cpp: In function `ll mul(ll, ll)':
0_0_5480752_20579.cpp:50: error: `mod' undeclared (first use this function)
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