Passage: As the Confederation, from its foundation in 1291, was almost exclusively composed of German-speaking regions, the earliest forms of literature are in German. In the 18th century, French became the fashionable language in Bern and elsewhere, while the influence of the French-speaking allies and subject lands was more marked than before.Among the classic authors of Swiss German literature are Jeremias Gotthelf (1797–1854) and Gottfried Keller (1819–1890). The undisputed giants of 20th-century Swiss literature are Max Frisch (1911–91) and Friedrich Dürrenmatt (1921–90), whose repertoire includes Die Physiker (The Physicists) and Das Versprechen (The Pledge), released in 2001 as a Hollywood film.Famous French-speaking writers were Jean-Jacques Rousseau (1712–1778) and Germaine de Staël (1766–1817). More recent authors include Charles Ferdinand Ramuz (1878–1947), whose novels describe the lives of peasants and mountain dwellers, set in a harsh environment and Blaise Cendrars (born Frédéric Sauser, 1887–1961). Italian and Romansh-speaking authors also contributed to the Swiss literary landscape, but generally in more modest ways given their small number.

Question: Who were the two major literary figures in 20th-century Switzerland?
Max Frisch (1911–91) and Friedrich Dürrenmatt (1921–90)