0_0_12839459_22494.cpp: In function `long long int poww(long long int, long long int)':
0_0_12839459_22494.cpp:30: error: `mul' undeclared (first use this function)
0_0_12839459_22494.cpp:30: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_12839459_22494.cpp:31: error: `mod' undeclared (first use this function)
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