Created
July 2, 2015 13:33
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桌上足球Rank排名算法
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var playersMap = { | |
"舒克": 1200, | |
"迟伤": 1200, | |
"沙陀": 1200, | |
"皓勋": 1200, | |
"圣耀": 1200, | |
"懂象": 1200, | |
"青也": 1200, | |
"呼荣": 1200 | |
}; | |
var gamelogs = [ | |
{ | |
victors: ['舒克', '迟伤'], | |
losers: ['青也', '呼荣'] | |
}, | |
{ | |
victors: ['舒克', '迟伤'], | |
losers: ['懂象', '圣耀'] | |
}, | |
{ | |
victors: ['舒克', '迟伤'], | |
losers: ['沙陀', '皓勋'] | |
}, | |
{ | |
victors: ['舒克', '迟伤'], | |
losers: ['青也', '呼荣'] | |
}, | |
{ | |
victors: ['舒克', '迟伤'], | |
losers: ['懂象', '圣耀'] | |
}, | |
{ | |
victors: ['舒克', '迟伤'], | |
losers: ['沙陀', '皓勋'] | |
}, | |
{ | |
victors: ['懂象', '圣耀'], | |
losers: ['青也', '呼荣'] | |
}, | |
{ | |
victors: ['沙陀', '皓勋'], | |
losers: ['懂象', '圣耀'] | |
}, | |
{ | |
victors: ['青也', '皓勋'], | |
losers: ['舒克', '迟伤'] | |
}, | |
]; | |
function main(){ | |
gamelogs.forEach(function(game){ | |
rank(game.victors, game.losers) | |
}); | |
} | |
function average(array){ | |
if(!array || array.length === 0){ | |
return null; | |
} | |
var sum = 0; | |
array.forEach(function(num){ | |
sum += num; | |
}); | |
return sum/array.length; | |
} | |
function getRanks(players){ | |
if(!players || players.length === 0){ | |
return null; | |
} | |
var ranks = []; | |
players.forEach(function(name){ | |
ranks.push(playersMap[name]); | |
}); | |
return ranks; | |
} | |
function setRanks(players, ranks){ | |
if(!players || players.length === 0 || !ranks || ranks.length === 0){ | |
return null; | |
} | |
ranks.forEach(function(rank, i){ | |
playersMap[players[i]] = rank; | |
}) | |
} | |
function rank(victors, losers){ | |
var victorsRanks = getRanks(victors); | |
var victorsAverage = average(victorsRanks); | |
var losersRanks = getRanks(losers); | |
var losersAverage = average(losersRanks); | |
var result = rankCore(victorsAverage, losersAverage); | |
victorsRanks = victorsRanks.map(function(rank){ | |
return rank + result.victorChange; | |
}); | |
losersRanks = losersRanks.map(function(rank){ | |
return rank + result.loserChange; | |
}); | |
// 设置分数 | |
setRanks(victors, victorsRanks) | |
setRanks(losers, losersRanks) | |
} | |
function rankCore(victor, loser){ | |
var Evictor = 1 / ( 1 + Math.pow(10, (loser - victor)/400) ); | |
var Eloser = 1 / ( 1 + Math.pow(10, (victor - loser)/400) ); | |
var result = {}; | |
result.victor = victor + 16 * ( 1 - Evictor ); | |
result.victorChange = result.victor - victor; | |
result.loser = loser + 16 * ( 0 - Eloser ); | |
result.loserChange = result.loser - loser; | |
return result; | |
} | |
main(); | |
console.log(playersMap); |
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