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fa73a73 · Jan 16, 2024

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English Version

题目描述

给你一个字符串数组 names ,和一个由 互不相同 的正整数组成的数组 heights 。两个数组的长度均为 n

对于每个下标 inames[i]heights[i] 表示第 i 个人的名字和身高。

请按身高 降序 顺序返回对应的名字数组 names

 

示例 1:

输入:names = ["Mary","John","Emma"], heights = [180,165,170]
输出:["Mary","Emma","John"]
解释:Mary 最高,接着是 Emma 和 John 。

示例 2:

输入:names = ["Alice","Bob","Bob"], heights = [155,185,150]
输出:["Bob","Alice","Bob"]
解释:第一个 Bob 最高,然后是 Alice 和第二个 Bob 。

 

提示:

  • n == names.length == heights.length
  • 1 <= n <= 103
  • 1 <= names[i].length <= 20
  • 1 <= heights[i] <= 105
  • names[i] 由大小写英文字母组成
  • heights 中的所有值互不相同

解法

方法一:排序

根据题目描述,我们可以创建一个长度为 n 的下标数组 i d x ,其中 i d x [ i ] = i 。然后我们对 i d x 中的每个下标按照 h e i g h t s 中对应的身高降序排序,最后遍历排序后的 i d x 中的每个下标 i ,将 n a m e s [ i ] 加入答案数组即可。

我们也可以创建一个长度为 n 的数组 a r r ,数组中每个元素是一个二元组 ( h e i g h t s [ i ] , i ) ,然后我们对 a r r 按照身高降序排序。最后遍历排序后的 a r r 中的每个元素 ( h e i g h t s [ i ] , i ) ,将 n a m e s [ i ] 加入答案数组即可。

时间复杂度 O ( n × log n ) ,空间复杂度 O ( n ) 。其中 n 是数组 n a m e s h e i g h t s 的长度。

class Solution:
    def sortPeople(self, names: List[str], heights: List[int]) -> List[str]:
        idx = list(range(len(heights)))
        idx.sort(key=lambda i: -heights[i])
        return [names[i] for i in idx]
class Solution {
    public String[] sortPeople(String[] names, int[] heights) {
        int n = names.length;
        Integer[] idx = new Integer[n];
        for (int i = 0; i < n; ++i) {
            idx[i] = i;
        }
        Arrays.sort(idx, (i, j) -> heights[j] - heights[i]);
        String[] ans = new String[n];
        for (int i = 0; i < n; ++i) {
            ans[i] = names[idx[i]];
        }
        return ans;
    }
}
class Solution {
public:
    vector<string> sortPeople(vector<string>& names, vector<int>& heights) {
        int n = names.size();
        vector<int> idx(n);
        iota(idx.begin(), idx.end(), 0);
        sort(idx.begin(), idx.end(), [&](int i, int j) { return heights[j] < heights[i]; });
        vector<string> ans;
        for (int i : idx) {
            ans.push_back(names[i]);
        }
        return ans;
    }
};
func sortPeople(names []string, heights []int) (ans []string) {
	n := len(names)
	idx := make([]int, n)
	for i := range idx {
		idx[i] = i
	}
	sort.Slice(idx, func(i, j int) bool { return heights[idx[j]] < heights[idx[i]] })
	for _, i := range idx {
		ans = append(ans, names[i])
	}
	return
}
function sortPeople(names: string[], heights: number[]): string[] {
    const n = names.length;
    const idx = new Array(n);
    for (let i = 0; i < n; ++i) {
        idx[i] = i;
    }
    idx.sort((i, j) => heights[j] - heights[i]);
    const ans: string[] = [];
    for (const i of idx) {
        ans.push(names[i]);
    }
    return ans;
}
impl Solution {
    pub fn sort_people(names: Vec<String>, heights: Vec<i32>) -> Vec<String> {
        let mut combine: Vec<(String, i32)> = names.into_iter().zip(heights.into_iter()).collect();
        combine.sort_by(|a, b| b.1.cmp(&a.1));
        combine
            .iter()
            .map(|s| s.0.clone())
            .collect()
    }
}

方法二

class Solution:
    def sortPeople(self, names: List[str], heights: List[int]) -> List[str]:
        return [name for _, name in sorted(zip(heights, names), reverse=True)]
class Solution {
    public String[] sortPeople(String[] names, int[] heights) {
        int n = names.length;
        int[][] arr = new int[n][2];
        for (int i = 0; i < n; ++i) {
            arr[i] = new int[] {heights[i], i};
        }
        Arrays.sort(arr, (a, b) -> b[0] - a[0]);
        String[] ans = new String[n];
        for (int i = 0; i < n; ++i) {
            ans[i] = names[arr[i][1]];
        }
        return ans;
    }
}
class Solution {
public:
    vector<string> sortPeople(vector<string>& names, vector<int>& heights) {
        int n = names.size();
        vector<pair<int, int>> arr;
        for (int i = 0; i < n; ++i) {
            arr.emplace_back(-heights[i], i);
        }
        sort(arr.begin(), arr.end());
        vector<string> ans;
        for (int i = 0; i < n; ++i) {
            ans.emplace_back(names[arr[i].second]);
        }
        return ans;
    }
};
func sortPeople(names []string, heights []int) []string {
	n := len(names)
	arr := make([][2]int, n)
	for i, h := range heights {
		arr[i] = [2]int{h, i}
	}
	sort.Slice(arr, func(i, j int) bool { return arr[i][0] > arr[j][0] })
	ans := make([]string, n)
	for i, x := range arr {
		ans[i] = names[x[1]]
	}
	return ans
}
function sortPeople(names: string[], heights: number[]): string[] {
    return names
        .map<[string, number]>((s, i) => [s, heights[i]])
        .sort((a, b) => b[1] - a[1])
        .map(([v]) => v);
}