View Compilation Error

0_0_9880499_28099.cpp: In function `int main()':
0_0_9880499_28099.cpp:22: error: redefinition of `int main()'
0_0_9880499_28099.cpp:3: error: `int main()' previously defined here
0_0_9880499_28099.cpp:24: error: `_int64' undeclared (first use this function)
0_0_9880499_28099.cpp:24: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_9880499_28099.cpp:24: error: expected `;' before "a"
0_0_9880499_28099.cpp:26: error: `a' undeclared (first use this function)