会议安排最优算法

var arr = new Array(31,22,43,14,15,16,77,190,210,98,61,78,45,33,68,92,109,110);
var morningArr = new Array();
var afternoonArr = new Array();
var morningLimit = 180;
var afternoonLimit = 240;
var days = 0;

var tmpresult = new Array();

var arrFactorResult = new Array();
////========================Core====================


function find_factor(sum, index,arr)   
{
    if(index < 0 || sum <= 0)
        return;  
      
    if(sum == arr[index])
    {  
        tmpresult.reverse();
	
	var tmpArr = new Array();
        for(var i =0 ; i < tmpresult.length; i++){
            tmpArr.push(tmpresult[i]);
			}
			
        tmpArr.push(arr[index]);
		
		if(arrFactorResult.indexOf(tmpArr) < 0)
		arrFactorResult.push(tmpArr);
		
        tmpresult.reverse();      
    }
	
    tmpresult.push(arr[index]);
	
    find_factor(sum-arr[index], index-1,arr);
    tmpresult.pop(); 
	
    find_factor(sum, index-1,arr);
	
}

function findCloseTo(n,arr,sessions){

for(var i = n ;i>0; i--){
tmpresult = new Array();
arrFactorResult = new Array();

find_factor(i,arr.length,arr);


if(arrFactorResult.length > 0)
{
break;
}
}

return arrFactorResult;

}


////================================================


////===============================================
////step 1: find the elements can only put in afternoon , put in afternoon Arr
function splitMorningAfternoon(){
for(var i = 0 ;i<arr.length;){
if(arr[i]>morningLimit && arr[i]<=afternoonLimit)
{
afternoonArr.push(arr[i]);
}
else{
morningArr.push(arr[i]);
}
arr.splice(i,1);
}

if(morningArr.length>0)
{
//echoL("Morning Session : ");
for(var i = 0;i<morningArr.length; i++){
//echo(morningArr[i] + ",");
}
}

if(afternoonArr.length){
//echoL("After noon Session");
for(var i = 0;i < afternoonArr.length;i++){
//echo(afternoonArr[i] + ",");
}

}
}


////================================================

////step 2: arrange morning session , if have not arranged , put in afternoon schedule 

function arrangeMorning(){
echoL("day "+ ++days);
var morningSessions = findCloseTo(morningLimit,morningArr);

if(morningSessions.length > 0){
echoL(" Morning Sessions :");

for(var i = 0;i<morningSessions[0].length;i++)
{
echo(morningSessions[0][i]+",");
morningArr.splice(morningArr.indexOf(morningSessions[0][i]),1);
}

}

//after morning arrangement , put rest items into afternoon
if(morningArr.length > 0){
//echoL("these sessions put to afternoon : ");
for(var i = 0;i < morningArr.length;i++)
{
afternoonArr.push(morningArr[i]);
//echo(morningArr[i] + ",");
}
}
}

function arrangeAfternoon(){


//start arrange afternoon
var afternoonSessions = findCloseTo(afternoonLimit,afternoonArr);

if(afternoonSessions.length > 0){
echoL(" Afternoon Sessions : ");
for(var i = 0;i < afternoonSessions[0].length;i++)
{
echo(afternoonSessions[0][i] + ",");
afternoonArr.splice(afternoonArr.indexOf(afternoonSessions[0][i]),1);
}

}

if(afternoonArr.length > 0)
{
echoL("pending sessions : ");
for(var i = 0;i<afternoonArr.length;i++)
echo(afternoonArr[i] +",");
}

}

function arrangeSession(){
splitMorningAfternoon();
arrangeMorning();
arrangeAfternoon();

if(afternoonArr.length > 0 ){
arr = afternoonArr;
morningArr = new Array();
afternoonArr = new Array();

arrangeSession();
}

}

arrangeSession();


////====================UTIL=========================

function echo(msg){
document.write(msg);
}

function echoL(msg){
document.write("<br />" + msg + "<br />");
}

////=================================================