結果
問題 | No.1645 AB's abs |
ユーザー | uw_yu1rabbit |
提出日時 | 2021-08-14 16:44:18 |
言語 | Rust (1.83.0 + proconio) |
結果 |
AC
|
実行時間 | 40 ms / 2,000 ms |
コード長 | 3,084 bytes |
コンパイル時間 | 13,485 ms |
コンパイル使用メモリ | 404,840 KB |
実行使用メモリ | 5,248 KB |
最終ジャッジ日時 | 2024-10-05 12:40:32 |
合計ジャッジ時間 | 15,651 ms |
ジャッジサーバーID (参考情報) |
judge4 / judge1 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 36 |
ソースコード
#[allow(dead_code)] fn solve(read: &mut snio::Reader<std::io::StdinLock<'_>>) { let n = read.usize(); let a:Vec<_> = (0..n).map(|_| read.i64() as i128).collect(); let mut mp = std::collections::HashMap::new(); *mp.entry(-a[0]).or_insert(0) += 1; *mp.entry(a[0]).or_insert(0) += 1; const MOD:i128 = 998244353; for i in 1..n { let mut tmp = std::collections::HashMap::new(); for (key,val) in &mp { *tmp.entry(key + a[i]).or_insert(0) += val; *tmp.entry(key - a[i]).or_insert(0) += val; } mp = tmp; } let mut rec = std::collections::HashMap::new(); for (key,val) in mp { *rec.entry(key.abs()).or_insert(0) += val; *rec.entry(key.abs()).or_insert(0) %= MOD; } //println!("{:?}",rec); let mut ans = 0; for (key,val) in rec { ans += (key * val) % MOD; ans %= MOD; } println!("{}",ans); } //use proconio::input; fn main() { let t = std::io::stdin(); let mut read = snio::Reader::new(t.lock()); let n = 1; for _ in 0..n { solve(&mut read); } } #[allow(dead_code)] pub mod snio { pub struct Reader<R: std::io::BufRead> { reader: R, buf: std::collections::VecDeque<String>, } impl<R: std::io::BufRead> Reader<R> { pub fn new(reader: R) -> Self { Self { reader, buf: std::collections::VecDeque::new(), } } fn load(&mut self) { while self.buf.is_empty() { let mut s = String::new(); let length = self.reader.read_line(&mut s).unwrap(); if length == 0 { break; } self.buf.extend(s.split_whitespace().map(|s| s.to_owned())); } } pub fn string(&mut self) -> String { self.load(); self.buf.pop_front().unwrap_or_else(|| panic!("input ended")) } pub fn char(&mut self) -> char { let string = self.string(); let mut chars = string.chars(); let res = chars.next().unwrap(); assert!(chars.next().is_none(), "invalid input!"); res } pub fn chars(&mut self) -> Vec<char> { self.read::<String>().chars().collect() } pub fn read<T: std::str::FromStr>(&mut self) -> T where <T as ::std::str::FromStr>::Err: ::std::fmt::Debug, { self.string().parse::<T>().expect("Failed to parse the input.") } } macro_rules! definition_of_reader_of_numbers { ($($ty:tt,)*) => { impl <R:std::io::BufRead> Reader<R> { $( #[inline] pub fn $ty (&mut self) -> $ty { self.read::<$ty>() } )* } } } definition_of_reader_of_numbers! { u8,u16,u32,u64,usize, i8,i16,i32,i64,isize, } }