afterFlatMapLambda.java

// "Replace Stream.flatMap().count() with Stream.mapToLong().sum()" "true"

import java.util.List;

public class Main {
  private String s;

  public Main(List<List<String>> s) {
    long count = s.stream().mapToLong((strings) -> {
      return (strings.size());
    }).sum();
  }
}