algorona 0.2.0

// Copyright 2021 tison <wander4096@gmail.com>.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

pub fn lower_bound(ns: Vec<i32>, t: i32) -> usize {
    let mut lo = 0;
    let mut hi = ns.len();
    while lo < hi {
        let mi = lo + ((hi - lo) >> 1);
        if ns[mi] < t {
            lo = mi + 1;
        } else {
            hi = mi;
        }
    }
    lo
}