Submission #26365878

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Source Code Expand

macro_rules! input {
  (source = $s:expr, $($r:tt)*) => {
      let mut iter = $s.split_whitespace();
      let mut next = || { iter.next().unwrap() };
      input_inner!{next, $($r)*}
  };
  ($($r:tt)*) => {
      let stdin = std::io::stdin();
      let mut bytes = std::io::Read::bytes(std::io::BufReader::new(stdin.lock()));
      let mut next = move || -> String{
          bytes
              .by_ref()
              .map(|r|r.unwrap() as char)
              .skip_while(|c|c.is_whitespace())
              .take_while(|c|!c.is_whitespace())
              .collect()
      };
      input_inner!{next, $($r)*}
  };
}

macro_rules! input_inner {
  ($next:expr) => {};
  ($next:expr, ) => {};

  ($next:expr, $var:ident : $t:tt $($r:tt)*) => {
      let $var = read_value!($next, $t);
      input_inner!{$next $($r)*}
  };
}

macro_rules! read_value {
  ($next:expr, ( $($t:tt),* )) => {
      ( $(read_value!($next, $t)),* )
  };

  ($next:expr, [ $t:tt ; $len:expr ]) => {
      (0..$len).map(|_| read_value!($next, $t)).collect::<Vec<_>>()
  };

  ($next:expr, chars) => {
      read_value!($next, String).chars().collect::<Vec<char>>()
  };

  ($next:expr, usize1) => {
      read_value!($next, usize) - 1
  };

  ($next:expr, $t:ty) => {
      $next().parse::<$t>().expect("Parse error")
  };
}

fn check(a: &[usize], m: usize, key: usize) -> bool {
    let mut k = 0;
    let mut tmp = 0;
    for aa in a {
        if aa - tmp >= m {
            tmp = *aa;
            k += 1;
        }
    }
    k >= key // trueならもっとmを大きくしてもいい余裕がある
}
fn binary_search(a: Vec<usize>, key: usize, mut low: usize, mut high: usize) -> usize {
  while high - low > 1 {
    let mid = low + (high - low) / 2;
    if check(&a, mid, key) {
      low = mid;
    }else{
      high = mid;
    }
  }
  low
}
fn main() {
    input! {
      n: usize,
      l: usize,
      k: usize,
      a: [usize;n],
    }
    let k = k + 1;
    let mut a = a;
    a.push(l);
    dbg!(&a);
    let ans = binary_search(a, k, 0, l);
    println!("{}", ans);
}

Submission Info

Judge Result