View Compilation Error

0_0_3968962_12112.cpp:5: error: `_int64' does not name a type
0_0_3968962_12112.cpp:10: error: `_int64' does not name a type
0_0_3968962_12112.cpp: In function `void work()':
0_0_3968962_12112.cpp:20: error: `ans' undeclared (first use this function)
0_0_3968962_12112.cpp:20: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_3968962_12112.cpp:24: error: `num' undeclared (first use this function)
0_0_3968962_12112.cpp:25: error: `mod' undeclared (first use this function)
0_0_3968962_12112.cpp:32: error: `t' undeclared (first use this function)
0_0_3968962_12112.cpp:36: error: `ch' undeclared (first use this function)