algorithm/2.html at main · Orekrigo/algorithm · GitHub

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>算法实验二</title>
    <style>
        * {
            padding: 0;
            margin: 0;
        }

        body {
            width: 100%;
            height: 100%;
            background-image: url("image/jianyue.jpeg");
            background-size: 100% 100%;
            background-repeat: no-repeat;
            background-attachment: fixed;
        }

        .first-container {
            text-align: center;
            padding-top: 150px;
            font-size: large;
        }

        .first-container input {
            margin-bottom: 20px;
            border-radius: 5px;
            font-size: 30px;
        }

        .first-container div {
            padding-right: 300px;
            color: white;
            font-size: 25px;
            padding-top: 20px;
        }

        .first-container button {
            font-size: 25px;
            border-radius: 5px;
            background-color: green;
            cursor: pointer;
        }

        .second-container {
            text-align: center;
            padding-top: 50px;
            font-size: large;
        }

        .second-container input {
            margin-bottom: 20px;
            border-radius: 5px;
            font-size: 30px;
        }

        .second-container div {
            padding-right: 300px;
            color: white;
            font-size: 25px;
            padding-top: 15px;
        }

        .second-container button {
            font-size: 25px;
            border-radius: 5px;
            background-color: green;
            cursor: pointer;
        }

        .second-container .ccc {
            margin-left: 20px;
        }
    </style>
</head>

<body>
    <div class="container">
        <div class="first-container">
            <input id="firstnum" type="text" placeholder="请在这里输入">
            <button onclick="firstclick()">确定</button>
            <div>最大子段和：<span id="res1"></span></div>
            <div>besti: <span id="res2"></span></div>
            <div>bestj: <span id="res3"></span></div>
        </div>
        <div class="second-container">
            <input id="secondnum" type="text" placeholder="请在这里输入">
            <input id="thirdnum" type="text" placeholder="请在这里输入">
            <button onclick="secondclick()">确定</button>
            <div>最长公共子序列： <span id="res4"> </span> </div>
            <div>最长公共子序列长度： <span id="res5"> </span> </div>
        </div>
    </div>
    <script>
        var besti = 0;
        var bestj = 0;
        var maxSubArray = function (nums) {
            let pre = 0, maxAns = nums[0];
            nums.forEach((x) => {
                pre = Math.max(pre + x, x);
                if (pre == x) {
                    besti = nums.indexOf(x) + 1;
                }
                maxAns = Math.max(maxAns, pre);
                if (maxAns == pre) {
                    bestj = nums.indexOf(x) + 1;
                }
            });
            return maxAns;
        };

        function firstclick() {
            var res1 = document.getElementById('res1');
            var res2 = document.getElementById('res2');
            var res3 = document.getElementById('res3');
            var num = document.getElementById('firstnum');
            nums = num.value;
            nums = nums.split(" ");
            var nums2 = [];
            for (let i = 0; i < nums.length; i++) {
                nums2.push(parseInt(nums[i]));
            }
            var result1 = maxSubArray(nums2);
            if (result1 < 0) { res1.innerText = 0; }
            else {
                res1.innerText = result1;
                res2.innerText = besti;
                res3.innerText = bestj;
            }
        }


        function printLCS(dp, str1, str2, i, j) {
            if (i == 0 || j == 0) {
                return "";
            }
            if (str1[i - 1] == str2[j - 1]) {
                return printLCS(dp, str1, str2, i - 1, j - 1) + str1[i - 1];
            } else {
                if (dp[i][j - 1] > dp[i - 1][j]) {
                    return printLCS(dp, str1, str2, i, j - 1);
                } else {
                    return printLCS(dp, str1, str2, i - 1, j);
                }
            }
        }
        var s;
        function LCS(str1, str2) {
            var m = str1.length
            var n = str2.length
            var dp = [new Array(n + 1).fill(0)] //第一行全是0
            for (var i = 1; i <= m; i++) { //一共有m+1行
                dp[i] = [0] //第一列全是0
                for (var j = 1; j <= n; j++) {//一共有n+1列
                    if (str1[i - 1] === str2[j - 1]) {
                        //注意这里，str1的第一个字符是在第二列中，因此要减1，str2同理
                        dp[i][j] = dp[i - 1][j - 1] + 1 //对角＋1
                    } else {
                        dp[i][j] = Math.max(dp[i - 1][j], dp[i][j - 1])
                    }
                }
            }
            s = printLCS(dp, str1, str2, m, n)
            return dp[m][n];
        };
        function secondclick() {
            var k;
            var res4 = document.getElementById('res4');
            var res5 = document.getElementById('res5');
            var num = document.getElementById('secondnum');
            var thirdnum = document.getElementById('thirdnum');
            nums1 = num.value;
            nums2 = thirdnum.value;
            nums3 = nums1.split(' ');
            nums4 = nums2.split(' ');
            console.log(nums3);
            console.log(nums4);
            var result2 = LCS(nums3, nums4);
            s = s.split("").join(",");
            res4.innerText = s;
            res5.innerText = result2;
        }
    </script>
</body>

</html>