// EXIT:0
// OUTPUT:count 20 sum 190 balanced
unit listuse;
import std.io;
import std.fmt;
import std.list;
import std.sys;

fn show(label: []u8, v: i32) -> void {
    var buf: [16]u8 = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0];
    let n: usize = fmt.fmt_i32(buf[..], v);
    io.print(label);
    io.print(" ");
    io.print(buf[0..n]);
    io.print(" ");
}

fn build() -> !i32 {
    var xs: list.List(i32) = try list.List(i32).with_capacity(2);
    var i: i32 = 0;
    while i < 20 {
        try xs.push(i);
        i = i + 1;
    }
    var sum: i32 = 0;
    var k: usize = 0;
    while k < xs.count() {
        sum = sum + xs.at(k);
        k = k + 1;
    }
    show("count", xs.count() as i32);
    show("sum", sum);
    return sum;
}

fn main() -> i32 {
    let sum: i32 = build() catch |e| { return 1; };
    if sum != 190 { return 2; }
    if sys.allocs() != sys.frees() { io.print("leaked\n"); return 3; }
    io.print("balanced\n");
    return 0;
}