Q31.js

// 1688. Count of Matches in Tournament

// You are given an integer n, the number of teams in a tournament that has strange rules:

// If the current number of teams is even, each team gets paired with another team. A total of n / 2 matches are played, and n / 2 teams advance to the next round.
// If the current number of teams is odd, one team randomly advances in the tournament, and the rest gets paired. A total of (n - 1) / 2 matches are played, and (n - 1) / 2 + 1 teams advance to the next round.
// Return the number of matches played in the tournament until a winner is decided.

var numberOfMatches = function(n) {
        let count = 0;
        while (n !== 1) {
            if (n%2 == 0) {
                n = n/2
                count = count + n;
            }else {
                n = (n-1)/2
                count = count + n;
                n = n+1
            }
        }
        return count;
};

let n = 14

console.log(numberOfMatches(n))