FleaRacing

function solve(input) {
    var i,
        jumpsAllowed,
        trackLength,
        fleaArr,
        fleaName,
        fleaLetter,
        fleaJumpDistance,
        fleaPosition,
        fleaData = {},
        jumpsCount = 0,
        foundWinner = false,
        winner,
        currentFlea,
        audienceString = '';


    //read input data
    for (i = 0; i < input.length; i++) {
        if (i === 0) {
            jumpsAllowed = Number(input[i]);
        } else if (i === 1) {
            trackLength = Number(input[i]);
        } else {
            fleaArr = input[i].split(', ');
            fleaName = fleaArr[0];
            fleaLetter = fleaName.toUpperCase().charAt(0);
            fleaJumpDistance = Number(fleaArr[1]);
            fleaPosition = 0;

            fleaData[fleaName] = {
                letter : fleaLetter,
                jumpDistance : fleaJumpDistance,
                position : fleaPosition,
                previousPosition : 0
            }
        }
    }

    //create audience strings
    for (var j = 0; j < trackLength; j++) {
        audienceString += '#';
    }

    //calculate race
    //first case - winner crosses or exactly on the finish line
    while (jumpsCount < jumpsAllowed) {

        for (var key in fleaData) {
            currentFlea = fleaData[key];
            currentFlea.previousPosition = currentFlea.position;
            currentFlea.position += currentFlea.jumpDistance;

            fleaData[key] = currentFlea;
            //check if the position is exactly on the finish line or behind it
            //to declare the winner
            if (currentFlea.position >= trackLength - 1) {
                foundWinner = true;
                winner = key;
                break;
            }
        }
        if (foundWinner == true) {
            console.log(audienceString);
            console.log(audienceString);

            for (var key in fleaData) {
                var pos = fleaData[key].position;

                if (pos > trackLength - 1) {
                    pos = fleaData[key].previousPosition;
                }
                var dotStr = '';
                for (var j = 0; j < pos; j++) {
                    dotStr += '.';
                }
                dotStr += fleaData[key].letter;
                for (var j = pos + 1; j < trackLength; j++) {
                    dotStr += '.';
                }
                console.log(dotStr);
            }

            console.log(audienceString);
            console.log(audienceString);
            console.log('Winner: ' + winner);
            break;
        }
        jumpsCount++;
    }

    //all fleas are equal
    if (!foundWinner) {
        var equalPos = true;
        var positions = [];
        for (var key in fleaData) {
            var pos = fleaData[key].position;
            positions.push(pos);
        }
        for (var k in positions) {
            if (positions[k] !== positions[0]) {
                equalPos = false;
            }
        }
        if (equalPos) {
            var keys = Object.keys(fleaData);
            var lastKey = keys[keys.length - 1];
            winner = lastKey;
            foundWinner = true;
        }
        //print result
        if (foundWinner == true) {
            console.log(audienceString);
            console.log(audienceString);

            for (var key in fleaData) {
                var pos = fleaData[key].position;

                if (pos > trackLength - 1) {
                    pos = fleaData[key].previousPosition;
                }
                var dotStr = '';
                for (var j = 0; j < pos; j++) {
                    dotStr += '.';
                }
                dotStr += fleaData[key].letter;
                for (var j = pos + 1; j < trackLength; j++) {
                    dotStr += '.';
                }
                console.log(dotStr);
            }

            console.log(audienceString);
            console.log(audienceString);
            console.log('Winner: ' + winner);
        }
    }

    //second case - no flea crosses the finish line, but one is ahead of the others
    if (!foundWinner) {

        var furthestFleaPos = 0;
        for (var key in fleaData) {
            var pos = fleaData[key].position;
            if (pos > furthestFleaPos) {
                furthestFleaPos = pos;
                winner = key;
                foundWinner = true;
            }
        }
        if (foundWinner == true) {
            console.log(audienceString);
            console.log(audienceString);

            for (var key in fleaData) {
                var pos = fleaData[key].position;

                if (pos > trackLength - 1) {
                    pos = fleaData[key].previousPosition;
                }
                var dotStr = '';
                for (var j = 0; j < pos; j++) {
                    dotStr += '.';
                }
                dotStr += fleaData[key].letter;
                for (var j = pos + 1; j < trackLength; j++) {
                    dotStr += '.';
                }
                console.log(dotStr);
            }

            console.log(audienceString);
            console.log(audienceString);
            console.log('Winner: ' + winner);
        }
    }
}