7 November 2019

• 11:3911:39, 7 November 2019 diff hist +1,030 N 2019 IMO Problems/Problem 5 Created page with "The Bank of Bath issues coins with an <math>H</math> on one side and a <math>T</math> on the other. Harry has <math>n</math> of these coins arranged in a line from left to rig..."
• 11:2911:29, 7 November 2019 diff hist +977 N 2019 IMO Problems/Problem 3 Created page with "== Problem == A social network has <math>2019</math> users, some pairs of whom are friends. Whenever user <math>A</math> is friends with user <math>B</math>, user <math>B</mat..."