背包問題副本 | JavaScript 程式專案

{"id":66697,"student_id":1587,"content":"//設定\n// noprotect\n\n// 三個等級 level 1 ~ 3\nlevel = 3;\n\n\nvar bestv = 0;\nvar record;\nvar bestw;\nfor (var i = 0; i \u003c 2**(5*level); i++) {\n    var num = i.toString(2); //把num變2進位制\n    // console.log(num);\n    while (num.length \u003c (5*level)) {\n        num = \"0\" + num;\n    }\n    // console.log(num);\n    var w = 0; //weight\n    var v = 0; //value\n    for (var x = 0; x \u003c (5*level); x++) {\n        if (num[x] == '1') {\n            w += shells[x].weight;\n            v += shells[x].value;\n        }\n    }\n    // console.log(w+\"-----\"+v);\n    if (w \u003c (level*1000) \u0026\u0026 v \u003e bestv) {\n        bestv = v;\n        bestw = w;\n        record = num;\n    }\n}\n\n\nconsole.log(record);\nconsole.log(bestv);\nconsole.log(bestw);\n//console.log();\nfor(var i=0; i\u003crecord.length; i++) {\n    if(record[i] == \"1\") {\n        take(shells[i]);\n    }\n}\n\n\n\n\n\n\n\n\n//背包問題是\"NP完全問題\"https://zh.wikipedia.org/wiki/P/NP%E9%97%AE%E9%A2%98#%E5%AD%A6%E6%9C%AF%E5%AE%9A%E4%B9%89\n\n//解釋:為什麼11100換成數字是28?\n//  1  1  1    0    0\n// 16  8  4    2    1\n// 要 要 要  不要 不要\n//16+8+4 = 28#","created_at":"2019-05-11T09:54:45.171+08:00","updated_at":"2019-10-13T20:56:42.650+08:00","name":"背包問題 副本","language":"javascript","screenshot":{"url":"https://cdn8.koding.school/uploads/project/screenshot/66697/c3250399ddada7a77856558155829869.jpg"},"parent_id":34006,"plugin":"setBackdrop(\"#222\");\n\nvar level = 1;\n\nvar env = (function () {\n\n    var shells = [\n        createSprite('shell_0.png'),\n        createSprite('shell_1.png'),\n        createSprite('shell_2.png'),\n        createSprite('shell_3.png'),\n        createSprite('shell_4.png'),\n        createSprite('shell_5.png'),\n        createSprite('shell_6.png'),\n        createSprite('shell_7.png'),\n        createSprite('shell_8.png'),\n        createSprite('shell_z.png'),\n        createSprite('shell_10.png'),\n        createSprite('shell_11.png'),\n        createSprite('shell_12.png'),\n        createSprite('shell_13.png'),\n        createSprite('shell_2.png'),\n    ];\n    \n    var bag = [];\n\n    var values = [150, 220, 220, 290, 425, 475, 470, 615, 610, 720, 990, 850, 900, 950, 1200];\n    var weight = [100, 210, 230, 330, 390, 470, 450, 610, 595, 710, 800, 890, 900, 900, 1250];\n    \n    var limit = [0, 1000, 2000, 3000];\n\n    shells.forEach((s, idx) =\u003e {\n        s.scale = 0.3;\n        s.opacity = 0.5;\n        s.x = 106 + 106*(idx%5);\n        s.y = 120 + 120*(Math.floor(idx/5))\n        s.value = values[idx];\n        s.weight = weight[idx];\n        \n        s.on('click', function () {\n            this.enlarge = true;\n            var idx = bag.indexOf(this);\n            if (idx != -1)  bag.splice(idx, 1);\n            else bag.push(this);\n        });\n    });\n    \n    forever(function(){\n        \n        if (level == 1) {\n            while (shells.length \u003e 5) shells.pop().destroy();\n        }\n        else if (level == 2) {\n            while (shells.length \u003e 10) shells.pop().destroy();\n        }\n        else if (level == 3) {\n            \n        } else {\n            level = 1;\n        }\n        \n        shells.forEach(function (s) {\n            if(s.touched(cursor)) {\n                if (cursor.isDown) s.scale = 0.35;\n                else s.scale = 0.3;\n                s.opacity = 1;\n                print(`價格 ${s.value} 元`,    cursor.x - 40, cursor.y + 20, 'white');\n                print(`重量 ${s.weight} 公斤`, cursor.x - 40, cursor.y + 40, 'white');\n            } else {\n                s.opacity = .5;\n            }\n        });\n        \n        var w = 0;\n        var v = 0;\n        bag.forEach(function (s) {\n            w += s.weight;\n            v += s.value;\n            s.opacity = 1;\n        });\n        print(`上限 ${limit[level]}`, 80, 30, 'white', 25);\n        print(`重量: ${w}`, 240, 30, w \u003c limit[level] ? 'white': 'orange', 25);\n        print(`價格: ${v}`, 400, 30, 'white', 25);\n    });\n    \n    return {\n        shells: shells,\n        bag: bag,\n        take: bag.push.bind(bag)\n    }\n})();\n\nvar shells = env.shells;\nvar take = env.take;\n","description":null,"note":null,"status":"public","like_student_ids":[],"is_featured":false,"views":87,"hashid":"6rps3rd9","is_content_changed":false,"review_status":"unsubmitted","submitted_at":null,"reviewed_at":null,"advise":null,"is_deleted":false}

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