// Copyright (C) 2015 by Alexandru Cojocaru

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.


fn lfd(v: Vec<u64>) -> u64 {
    let mut min = std::u64::MAX;
    let mut lfd = 0;
    for n in v {
	min = std::cmp::min(min, n);
	lfd = std::cmp::max(lfd, n - min);
    }
    lfd
}

fn main() {
    println!("{}", lfd(vec![1, 5, 7, 2, 9]));
    println!("{}", lfd(vec![4, 3, 2, 1]));
    println!("{}", lfd(vec![9, 1, 8]));
}