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[7/1] 1710. Maximum Units on a Truck

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작성일 2022.06.30 20:25

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You are assigned to put some amount of boxes onto one truck. You are given a 2D array boxTypes, where boxTypes[i] = [numberOfBoxesi, numberOfUnitsPerBoxi]:

numberOfBoxesi is the number of boxes of type i.
numberOfUnitsPerBoxi is the number of units in each box of the type i.

You are also given an integer truckSize, which is the maximum number of boxes that can be put on the truck. You can choose any boxes to put on the truck as long as the number of boxes does not exceed truckSize.

Return the maximum total number of units that can be put on the truck.

Example 1:

Input: boxTypes = [[1,3],[2,2],[3,1]], truckSize = 4
Output: 8
Explanation: There are:
- 1 box of the first type that contains 3 units.
- 2 boxes of the second type that contain 2 units each.
- 3 boxes of the third type that contain 1 unit each.
You can take all the boxes of the first and second types, and one box of the third type.
The total number of units will be = (1 * 3) + (2 * 2) + (1 * 1) = 8.

Example 2:

Input: boxTypes = [[5,10],[2,5],[4,7],[3,9]], truckSize = 10
Output: 91

Constraints:

1 <= boxTypes.length <= 1000
1 <= numberOfBoxesi, numberOfUnitsPerBoxi <= 1000
1 <= truckSize <= 106

#Amazon, #JPMorgan, #LinkedIn, #Array, #Greedy, #Sorting

링크

https://leetcode.com/problems/maximum-units-on-a-truck/ 2192 회 연결

익명
작성일 2022.07.01 09:45

Runtime: 292 ms, faster than 28.01% of Python3 online submissions for Maximum Units on a Truck.
Memory Usage: 14.5 MB, less than 5.52% of Python3 online submissions for Maximum Units on a Truck.

class Solution:
    def maximumUnits(self, boxTypes: List[List[int]], truckSize: int) -> int:
        boxTypes = sorted(boxTypes, key=lambda x:x[1], reverse = True)
        
        units = 0
        
        for boxnum, unitsperbox in boxTypes:
            loading_boxes = min(boxnum, truckSize)
            units += loading_boxes * unitsperbox
            
            truckSize -= loading_boxes
            
            if not truckSize: return units
        return units

익명
작성일 2022.07.01 14:08

C++
Runtime: 43 ms, faster than 93.94% of C++ online submissions for Maximum Units on a Truck.
Memory Usage: 16 MB, less than 77.85% of C++ online submissions for Maximum Units on a Truck.

class Solution {
public:
    int maximumUnits(vector<vector<int>>& boxTypes, int truckSize) {
        int result = 0;
        int n = boxTypes.size();
        
        sort(boxTypes.begin(), boxTypes.end(), [](vector<int> const &a, vector<int> const &b) {
            return a[1] > b[1];
        });
        
        for (int i = 0; i < n && truckSize > 0; ++i) {
            result += min(boxTypes[i][0], truckSize) * boxTypes[i][1];
            truckSize -= boxTypes[i][0];
        }
        return result;
    }
};