给定指定数和一个数组组合，求合为指定数的最少次数组合

gistfile1.txt

var ret = [];
var levels = [698, 208, 128, 68, 6];

function getRet(sum, level){debugger;
    if(!level) level = 0;
    if(level > levels.length - 1) return false;
    var thisCount = Math.floor(sum / levels[level]);
    while(thisCount >= 0){
        ret[level] = thisCount;
        var nextSum = sum - thisCount*levels[level];
        var ok;
        if(nextSum){
            ok = getRet(nextSum, level+1);
        }else{ok = true;}
        if(!ok){
            thisCount--;
        }else{
            return ret;
        }
    }
    return false;
}