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  1. use std::collections::HashMap;
  2.  
  3. fn main() {
  4.     let data = r#"outlook	temperature	humidity	windy	play
  5. sunny	hot	high	FALSE	no
  6. sunny	hot	high	TRUE	no
  7. overcast	hot	high	FALSE	yes
  8. rainy	mild	high	FALSE	yes
  9. rainy	cool	normal	FALSE	yes
  10. rainy	cool	normal	TRUE	no
  11. overcast	cool	normal	TRUE	yes
  12. sunny	mild	high	FALSE	no
  13. sunny	cool	normal	FALSE	yes
  14. rainy	mild	normal	FALSE	yes
  15. sunny	mild	normal	TRUE	yes
  16. overcast	mild	high	TRUE	yes
  17. overcast	hot	normal	FALSE	yes
  18. rainy	mild	high	TRUE	no"#;
  19.  
  20.     let lines: Vec<&str> = data.lines().collect();
  21.     let headers: Vec<&str> = lines[0].split('\t').collect();
  22.     let mut counts: HashMap<&str, HashMap<&str, usize>> = HashMap::new();
  23.  
  24.     for &header in &headers {
  25.         counts.insert(header, HashMap::new());
  26.     }
  27.  
  28.     for line in &lines[1..] {
  29.         let fields: Vec<&str> = line.split('\t').collect();
  30.         for (i, val) in fields.iter().enumerate() {
  31.             let map = counts.get_mut(headers[i]).unwrap();
  32.             *map.entry(val).or_insert(0) += 1;
  33.         }
  34.     }
  35.  
  36.     for h in &headers {
  37.         println!("{} counts:", h);
  38.         for (k, v) in &counts[h] {
  39.             println!("  {}: {}", k, v);
  40.         }
  41.     }
  42. }
  43.  
Success #stdin #stdout 0s 5320KB
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Standard input is empty
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outlook counts:
  rainy: 5
  overcast: 4
  sunny: 5
temperature counts:
  mild: 6
  cool: 4
  hot: 4
humidity counts:
  normal: 7
  high: 7
windy counts:
  TRUE: 6
  FALSE: 8
play counts:
  no: 5
  yes: 9
https://ideone.com/PLEVh7
language:
Rust (rust 1.56)
created:
15 days ago
visibility:
public

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