View Compilation Error

0_0_2746307_32275.cpp: In function `long long int power(long long int, long long int, long long int)':
0_0_2746307_32275.cpp:6: error: `int64' undeclared (first use this function)
0_0_2746307_32275.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2746307_32275.cpp:6: error: expected `;' before "tmp"
0_0_2746307_32275.cpp:8: error: `tmp' undeclared (first use this function)
0_0_2746307_32275.cpp: In function `long long int solve(long long int, long long int, long long int)':
0_0_2746307_32275.cpp:17: error: `int64' undeclared (first use this function)
0_0_2746307_32275.cpp:17: error: expected `;' before "A"
0_0_2746307_32275.cpp:18: error: expected `;' before "res"
0_0_2746307_32275.cpp:20: error: `res' undeclared (first use this function)
0_0_2746307_32275.cpp:20: error: `A' undeclared (first use this function)