// EXIT:0
// OUTPUT:sum 4950
unit heap;
import std.io;
import std.fmt;

fn build(n: usize) -> !^[]mut i32 {
    var cells: ^[]mut i32 = try mem.alloc_slice(i32, n);
    var i: usize = 0;
    while i < n {
        cells.^[i] = i as i32;
        i = i + 1;
    }
    return cells;
}

fn main() -> i32 {
    let cells: ^[]mut i32 = build(100) catch |e| { return 1; };
    defer { mem.destroy(cells); }
    var sum: i32 = 0;
    for v in cells.^ {
        sum = sum + v.^;
    }
    var buf: [16]u8 = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0];
    let k: usize = fmt.fmt_i32(buf[..], sum);
    io.print("sum ");
    io.print(buf[0..k]);
    io.print("\n");
    return 0;
}