Kirill Litvin

Code sample

Function, that takes the amount of handshakes and returns the minimal amount of people needed to perform these handshakes (a pair of farmers handshake only once).

function getParticipants(handshakes){
    // formula handshakes = n*(n - 1) /2
    let d = 1 - (4 * (-2 * handshakes));
    let result = (1 + Math.sqrt(d)) / 2;
    return Math.ceil(result);
}