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1487. 保证文件名唯一

给你一个长度为 n 的字符串数组 names 。你将会在文件系统中创建 n 个文件夹:在第 i 分钟,新建名为 names[i] 的文件夹。

由于两个文件 不能 共享相同的文件名,因此如果新建文件夹使用的文件名已经被占用,系统会以 (k) 的形式为新文件夹的文件名添加后缀,其中 k 是能保证文件名唯一的 最小正整数

返回长度为 n 的字符串数组,其中 ans[i] 是创建第 i 个文件夹时系统分配给该文件夹的实际名称。

 

示例 1:

输入:names = ["pes","fifa","gta","pes(2019)"]
输出:["pes","fifa","gta","pes(2019)"]
解释:文件系统将会这样创建文件名:
"pes" --> 之前未分配,仍为 "pes"
"fifa" --> 之前未分配,仍为 "fifa"
"gta" --> 之前未分配,仍为 "gta"
"pes(2019)" --> 之前未分配,仍为 "pes(2019)"

示例 2:

输入:names = ["gta","gta(1)","gta","avalon"]
输出:["gta","gta(1)","gta(2)","avalon"]
解释:文件系统将会这样创建文件名:
"gta" --> 之前未分配,仍为 "gta"
"gta(1)" --> 之前未分配,仍为 "gta(1)"
"gta" --> 文件名被占用,系统为该名称添加后缀 (k),由于 "gta(1)" 也被占用,所以 k = 2 。实际创建的文件名为 "gta(2)" 。
"avalon" --> 之前未分配,仍为 "avalon"

示例 3:

输入:names = ["onepiece","onepiece(1)","onepiece(2)","onepiece(3)","onepiece"]
输出:["onepiece","onepiece(1)","onepiece(2)","onepiece(3)","onepiece(4)"]
解释:当创建最后一个文件夹时,最小的正有效 k 为 4 ,文件名变为 "onepiece(4)"。

示例 4:

输入:names = ["wano","wano","wano","wano"]
输出:["wano","wano(1)","wano(2)","wano(3)"]
解释:每次创建文件夹 "wano" 时,只需增加后缀中 k 的值即可。

示例 5:

输入:names = ["kaido","kaido(1)","kaido","kaido(1)"]
输出:["kaido","kaido(1)","kaido(2)","kaido(1)(1)"]
解释:注意,如果含后缀文件名被占用,那么系统也会按规则在名称后添加新的后缀 (k) 。

 

提示:

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class Solution { public: vector<string> getFolderNames(vector<string>& names) { } };

cpp 解法, 执行用时: 240 ms, 内存消耗: 57.2 MB, 提交时间: 2023-03-03 09:11:57

class Solution {
public:
    vector<string> getFolderNames(vector<string>& names) {
        unordered_map<string, int> d;
        for (auto& name : names) {
            int k = d[name];
            if (k) {
                while (d[name + "(" + to_string(k) + ")"]) {
                    k++;
                }
                d[name] = k;
                name += "(" + to_string(k) + ")";
            }
            d[name] = 1;
        }
        return names;
    }
};

java 解法, 执行用时: 67 ms, 内存消耗: 53.8 MB, 提交时间: 2023-03-03 09:11:24

class Solution {
    public String[] getFolderNames(String[] names) {
        Map<String, Integer> index = new HashMap<String, Integer>();
        int n = names.length;
        String[] res = new String[n];
        for (int i = 0; i < n; i++) {
            String name = names[i];
            if (!index.containsKey(name)) {
                res[i] = name;
                index.put(name, 1);
            } else {
                int k = index.get(name);
                while (index.containsKey(addSuffix(name, k))) {
                    k++;
                }
                res[i] = addSuffix(name, k);
                index.put(name, k + 1);
                index.put(addSuffix(name, k), 1);
            }
        }
        return res;
    }

    public String addSuffix(String name, int k) {
        return name + "(" + k + ")";
    }
}

javascript 解法, 执行用时: 212 ms, 内存消耗: 63.2 MB, 提交时间: 2023-03-03 09:11:08

/**
 * @param {string[]} names
 * @return {string[]}
 */
var getFolderNames = function(names) {
    const index = new Map();
    const n = names.length;
    const res = new Array(n).fill(0);
    for (let i = 0; i < n; i++) {
        const name = names[i];
        if (!index.has(name)) {
            res[i] = name;
            index.set(name, 1);
        } else {
            let k = index.get(name);
            while (index.has(addSuffix(name, k))) {
                k++;
            }
            res[i] = addSuffix(name, k);
            index.set(name, k + 1);
            index.set(addSuffix(name, k), 1);
        }
    }
    return res;
}

const addSuffix = (name, k) => {
    return name + "(" + k + ")";
};

golang 解法, 执行用时: 104 ms, 内存消耗: 11.9 MB, 提交时间: 2023-03-03 09:10:52

func getFolderNames(names []string) []string {
    ans := make([]string, len(names))
    index := map[string]int{}
    for p, name := range names {
        i := index[name]
        if i == 0 {
            index[name] = 1
            ans[p] = name
            continue
        }
        for index[name+"("+strconv.Itoa(i)+")"] > 0 {
            i++
        }
        t := name + "(" + strconv.Itoa(i) + ")"
        ans[p] = t
        index[name] = i + 1
        index[t] = 1
    }
    return ans
}

python3 解法, 执行用时: 132 ms, 内存消耗: 31.4 MB, 提交时间: 2023-03-03 09:10:36

class Solution:
    def getFolderNames(self, names: List[str]) -> List[str]:
        ans = []
        index = {}
        for name in names:
            if name not in index:
                ans.append(name)
                index[name] = 1
            else:
                k = index[name]
                while name + '(' + str(k) + ')' in index:
                    k += 1
                t = name + '(' + str(k) + ')'
                ans.append(t)
                index[name] = k + 1
                index[t] = 1
        return ans

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