View Compilation Error

0_0_4418412_3774.cpp:21: error: `____int6464' does not name a type
0_0_4418412_3774.cpp: In function `long long int mod_exp(long long int, long long int, long long int)':
0_0_4418412_3774.cpp:42: error: `mod_mul' undeclared (first use this function)
0_0_4418412_3774.cpp:42: error: (Each undeclared identifier is reported only once for each function it appears in.)