Codility - Counting: FrogRiverOne

FrogRiverOne.js

function solution(X, A) {
    // write your code in JavaScript (Node.js 0.12)
    var count = new Array(X);
    for ( var i=0; i < A.length; i++) {
        var info = {
            minute : i,
            count : 1
        };
        if (!count[A[i]])
            count[A[i]] = info;
        else {
            count[A[i]].count ++;
            if (count[A[i]].minute > info.minute) {
                count[A[i]]. minute = info.minute;
            }
        }
    }
    var latestTime = 0;
    for ( var i=1; i < count.length; i++) {
        if (!count[i]) {
            return -1    
        } else {
            if (latestTime < count[i].minute ) {
                latestTime = count[i].minute;
            }
        }
    }
    return latestTime;
}