View Compilation Error

0_0_2503083_8906.cpp: In function `int gbs(int, int)':
0_0_2503083_8906.cpp:16: error: expected `;' before "return"
0_0_2503083_8906.cpp: At global scope:
0_0_2503083_8906.cpp:19: error: `main' must return `int'
0_0_2503083_8906.cpp: In function `int main(...)':
0_0_2503083_8906.cpp:21: error: `_int64' undeclared (first use this function)
0_0_2503083_8906.cpp:21: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2503083_8906.cpp:21: error: expected `;' before "ys"
0_0_2503083_8906.cpp:24: error: `ys' undeclared (first use this function)