Description
Given a list of the scores of different students, items, where items[i] = [IDi, scorei] represents one score from a student with IDi, calculate each student's top five average.
Return the answer as an array of pairs result, where result[j] = [IDj, topFiveAveragej] represents the student with IDj and their top five average. Sort result by IDj in increasing order.
A student's top five average is calculated by taking the sum of their top five scores and dividing it by 5 using integer division.
Example 1:
Input: items = [[1,91],[1,92],[2,93],[2,97],[1,60],[2,77],[1,65],[1,87],[1,100],[2,100],[2,76]]
Output: [[1,87],[2,88]]
Explanation:
The student with ID = 1 got scores 91, 92, 60, 65, 87, and 100. Their top five average is (100 + 92 + 91 + 87 + 65) / 5 = 87.
The student with ID = 2 got scores 93, 97, 77, 100, and 76. Their top five average is (100 + 97 + 93 + 77 + 76) / 5 = 88.6, but with integer division their average converts to 88.
Example 2:
Input: items = [[1,100],[7,100],[1,100],[7,100],[1,100],[7,100],[1,100],[7,100],[1,100],[7,100]]
Output: [[1,100],[7,100]]
Constraints:
1 <= items.length <= 1000items[i].length == 21 <= IDi <= 10000 <= scorei <= 100- For each
IDi, there will be at least five scores.
Solutions
Solution 1
PythonJavaC++GoTypeScript
class Solution:
def highFive(self, items: List[List[int]]) -> List[List[int]]:
d = defaultdict(list)
m = 0
for i, x in items:
d[i].append(x)
m = max(m, i)
ans = []
for i in range(1, m + 1):
if xs := d[i]:
avg = sum(nlargest(5, xs)) // 5
ans.append([i, avg])
return ans(code-box)
class Solution {
public int[][] highFive(int[][] items) {
int size = 0;
PriorityQueue[] s = new PriorityQueue[101];
int n = 5;
for (int[] item : items) {
int i = item[0], score = item[1];
if (s[i] == null) {
++size;
s[i] = new PriorityQueue<>(n);
}
s[i].offer(score);
if (s[i].size() > n) {
s[i].poll();
}
}
int[][] res = new int[size][2];
int j = 0;
for (int i = 0; i < 101; ++i) {
if (s[i] == null) {
continue;
}
int avg = sum(s[i]) / n;
res[j][0] = i;
res[j++][1] = avg;
}
return res;
}
private int sum(PriorityQueue<Integer> q) {
int s = 0;
while (!q.isEmpty()) {
s += q.poll();
}
return s;
}
}(code-box)
class Solution {
public:
vector<vector<int>> highFive(vector<vector<int>>& items) {
vector<int> d[1001];
for (auto& item : items) {
int i = item[0], x = item[1];
d[i].push_back(x);
}
vector<vector<int>> ans;
for (int i = 1; i <= 1000; ++i) {
if (!d[i].empty()) {
sort(d[i].begin(), d[i].end(), greater<int>());
int s = 0;
for (int j = 0; j < 5; ++j) {
s += d[i][j];
}
ans.push_back({i, s / 5});
}
}
return ans;
}
};(code-box)
func highFive(items [][]int) (ans [][]int) {
d := make([][]int, 1001)
for _, item := range items {
i, x := item[0], item[1]
d[i] = append(d[i], x)
}
for i := 1; i <= 1000; i++ {
if len(d[i]) > 0 {
sort.Ints(d[i])
s := 0
for j := len(d[i]) - 1; j >= len(d[i])-5; j-- {
s += d[i][j]
}
ans = append(ans, []int{i, s / 5})
}
}
return ans
}(code-box)
function highFive(items: number[][]): number[][] {
const d: number[][] = Array(1001)
.fill(0)
.map(() => Array(0));
for (const [i, x] of items) {
d[i].push(x);
}
const ans: number[][] = [];
for (let i = 1; i <= 1000; ++i) {
if (d[i].length > 0) {
d[i].sort((a, b) => b - a);
const s = d[i].slice(0, 5).reduce((a, b) => a + b);
ans.push([i, Math.floor(s / 5)]);
}
}
return ans;
}(code-box)
