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use std::error::Error;
use std::io;
use std::process;
use serde::Deserialize;
#[derive(Debug, Deserialize)]
#[serde(rename_all = "PascalCase")]
struct Record<'a> {
country: &'a str,
city: &'a str,
accent_city: &'a str,
region: &'a str,
population: Option<u64>,
latitude: f64,
longitude: f64,
}
fn run() -> Result<u64, Box<dyn Error>> {
let mut rdr = csv::Reader::from_reader(io::stdin());
let mut raw_record = csv::StringRecord::new();
let headers = rdr.headers()?.clone();
let mut count = 0;
while rdr.read_record(&mut raw_record)? {
let record: Record = raw_record.deserialize(Some(&headers))?;
if record.country == "us" && record.region == "MA" {
count += 1;
}
}
Ok(count)
}
fn main() {
match run() {
Ok(count) => {
println!("{}", count);
}
Err(err) => {
println!("{}", err);
process::exit(1);
}
}
}
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