View Compilation Error

0_0_12101034_18998.cpp:7: error: `int64' does not name a type
0_0_12101034_18998.cpp: In function `int main()':
0_0_12101034_18998.cpp:12: error: `int64' undeclared (first use this function)
0_0_12101034_18998.cpp:12: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_12101034_18998.cpp:12: error: expected `;' before "max_now"
0_0_12101034_18998.cpp:18: error: `dp' undeclared (first use this function)
0_0_12101034_18998.cpp:18: error: `b' undeclared (first use this function)
0_0_12101034_18998.cpp:21: error: `max_now' undeclared (first use this function)
0_0_12101034_18998.cpp:21: error: integer constant is too large for "long" type