0_0_9300020_31942.cpp: In function `int multi(cp*, int, cp*, int, cp*, int&)':
0_0_9300020_31942.cpp:39: error: `M_PI' undeclared (first use this function)
0_0_9300020_31942.cpp:39: error: (Each undeclared identifier is reported only once for each function it appears in.)
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