View Compilation Error

0_0_9914759_26974.cpp:4: error: `_int64' does not name a type
0_0_9914759_26974.cpp:5: error: `i64' does not name a type
0_0_9914759_26974.cpp: In function `void init()':
0_0_9914759_26974.cpp:7: error: `d' undeclared (first use this function)
0_0_9914759_26974.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_9914759_26974.cpp:11: error: `sum' undeclared (first use this function)
0_0_9914759_26974.cpp: In function `int main()':
0_0_9914759_26974.cpp:18: error: `i64' undeclared (first use this function)
0_0_9914759_26974.cpp:18: error: expected `;' before "ans"
0_0_9914759_26974.cpp:33: error: `ans' undeclared (first use this function)
0_0_9914759_26974.cpp:33: error: `sum' undeclared (first use this function)
0_0_9914759_26974.cpp:33: error: `ret' undeclared (first use this function)
0_0_9914759_26974.cpp:37: error: `d' undeclared (first use this function)