Stop using some of the crates

Author: qryxip

examples/abc084-d.rs

@@ -1,14 +1,13 @@
 // https://atcoder.jp/contests/abc129/tasks/abc129_f
 
-use derive_more::Display;
 use ndarray::{array, Array2, LinalgScalar};
 use num::{PrimInt, Unsigned};
 use num_derive::{One, Zero};
 
 use std::cell::Cell;
-use std::cmp;
 use std::io::{self, Read};
 use std::ops::{Add, Div, Mul, Sub};
+use std::{cmp, fmt};
 
 fn main() {
     let mut input = read_to_static(io::stdin()).split_whitespace();
@@ -59,7 +58,7 @@ thread_local! {
     static MOD: Cell<u64> = Cell::new(0);
 }
 
-#[derive(Zero, One, Display, Debug, Clone, Copy)]
+#[derive(Zero, One, Debug, Clone, Copy)]
 struct Z(u64);
 
 impl Z {
@@ -68,6 +67,12 @@ impl Z {
     }
 }
 
+impl fmt::Display for Z {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        fmt::Display::fmt(&self.0, fmt)
+    }
+}
+
 impl Add for Z {
     type Output = Self;
 

examples/abc120-d.rs

@@ -1,31 +1,20 @@
 // https://atcoder.jp/contests/APG4b/tasks/APG4b_a
 
-use aho_corasick as _;
 use alga as _;
-use approx as _;
 use ascii as _;
 use bitset_fixed as _;
-use defmac as _;
-use derive_more as _;
-use derive_new as _;
 use either as _;
-use euclid as _;
 use fixedbitset as _;
 use getrandom as _;
-use if_chain as _;
 use im_rc as _;
 use indexmap as _;
 use itertools as _;
 use itertools_num as _;
 use lazy_static as _;
 use libm as _;
 use maplit as _;
-#[allow(unused_imports)]
-use matches::matches as _; // https://github.com/rust-lang/rust/issues/66518
-use modtype as _;
 use nalgebra as _;
 use ndarray as _;
-use nom as _;
 use num as _;
 use num_bigint as _;
 use num_complex as _;
@@ -37,10 +26,6 @@ use num_traits as _;
 use ordered_float as _;
 use permutohedron as _;
 use petgraph as _;
-use primal as _;
-use primal_check as _;
-use primal_estimate as _;
-use primal_sieve as _;
 use proconio as _;
 use rand as _;
 use rand_chacha as _;
@@ -51,18 +36,10 @@ use rand_pcg as _;
 use regex as _;
 use rustc_hash as _;
 use smallvec as _;
-use strsim as _;
 use superslice as _;
-use take_mut as _;
 use text_io as _;
-use union_find as _;
 use whiteread as _;
 
-#[cfg(feature = "jemalloc-ctl")]
-use jemalloc_ctl as _;
-#[cfg(feature = "jemallocator")]
-use jemallocator as _;
-
 fn main() {
     println!("Hello, world!");
 }