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use std::time::Instant; use rayon::prelude::*; fn flip_coins(num_heads: u32) -> bool { let mut heads_in_a_row = 0; while heads_in_a_row < num_heads { if rand::random_bool(0.5) { heads_in_a_row += 1; } else { return false; } } true } fn main() { let num_heads = 20; // Normal version let start_time = Instant::now(); while !flip_coins(num_heads) { continue; } println!("Normal version: {:?}", start_time.elapsed()); // Parallel version let start_time = Instant::now(); (0u64..u64::MAX) .into_par_iter() .find_any(|_| flip_coins(num_heads)); println!("Parallel version: {:?}", start_time.elapsed()); }
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