放个代码吧，只有核心部分，数据处理我都是在赛码里调的，本地没做 （1） let n = 2 let sum = 0 for (let i = 1; i <= n; i++) { sum += 1 / (10 * n - 5) sum -= 1 / (10 * n) } console.log(sum.toFixed(4)) （2） let n = 6 let a = "A B C D E E" let b = "A E D C B B" a = a.split(" ") b = b.split(" ") let dp = [] for (let i = 0; i < n; i++) { dp[i] = new Array(n) } for (let i = 0; i < n; i++) { for (let j = 0; j < n; j++) { if (a[i] == b[j]) { dp[i][j] = ((i - 1 < 0 || j - 1 < 0) ? 0 : dp[i - 1][j - 1]) + 1 } else { dp[i][j] = Math.max(i - 1 < 0 ? 0 : dp[i - 1][j], j - 1 < 0 ? 0 : dp[i][j - 1]) } } } console.log(dp[n - 1][n - 1])