View Compilation Error

45412_0_31964.cpp: In function `void build(int*, int*, int, int)':
45412_0_31964.cpp:20: error: invalid conversion from `int' to `int*'
45412_0_31964.cpp: At global scope:
45412_0_31964.cpp:28: error: `main' must return `int'
45412_0_31964.cpp: In function `int main(...)':
45412_0_31964.cpp:35: error: incompatible types in assignment of `int' to `int[20]'