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  1. Hash Tables: Ice Cream Parlor
  2. Discussions

Hash Tables: Ice Cream Parlor

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669 Discussions

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  • shrutimadan649
     + 0 comments

    JAVA Solution:

        int[] arr=cost.stream().mapToInt(Integer::intValue).toArray();
Arrays.sort(arr);
int start=0;
int end=arr.length-1;
while(start<end){
    if(arr[start]+arr[end]>money){
        end--;
    }
    else if(arr[start]+arr[end]<money){
        start++;
    }
    else{
        TreeSet<Integer> res=new TreeSet<>();
        res.add(cost.indexOf(arr[start])+1);
        int pos2=cost.indexOf(arr[end])+1;;
        if(arr[start]==arr[end]){
            cost.remove(cost.indexOf(arr[start]));
        pos2=cost.indexOf(arr[end])+2;
        }
        res.add(pos2);


        System.out.print(res.first()+" "+res.last());
        System.out.println();
        break;
    }
}

  • mrsagcan
     + 0 comments

    C++ Solution

    void whatFlavors(vector<int> cost, int money) 
{
    map<int, int> hash;
    for(int i = 0; i < cost.size(); i++)
    {
        int remaining_money = money - cost[i];
        if(remaining_money <= 0) continue; // cant buy a second flavor so continues
        if(hash[remaining_money] > 0) //if it exists
        {
            cout << hash[remaining_money] << " " << i + 1 << endl;
            return;
        }
        hash[cost[i]] = i + 1;
    }
}

  • jacopo_maragna1
     + 0 comments

    Python3

    def whatFlavors(cost, money):
    mapping = {}
    
    for i in range(len(cost)):
        current_price = cost[i]
        if current_price in mapping.keys():
            if mapping[current_price] < i + 1:
                # Print complement price index first
                print("{} {}".format(mapping[current_price], i + 1))
            else:
                print("{} {}".format(i + 1, mapping[cost[i]]))
        # Map current price index to complement price
        mapping[money - current_price] = i + 1

  • billyzs_728
     + 0 comments
    from collections import defaultdict
def whatFlavors(cost, money):
    # Write your code here
    cache = defaultdict(list)
    for idx, c in enumerate(cost, 1):
        if l := cache[money-c]:
            print(l[0], idx)
            return
        cache[c].append(idx)

  • KLU2300031107
     + 0 comments

    include

    void findIceCream(int money, int n, int cost[]) { int i, j; for (i = 0; i < n - 1; i++) { for (j = i + 1; j < n; j++) { if (cost[i] + cost[j] == money) { printf("%d %d\n", i + 1, j + 1); // 1-based index return; } } } }

    int main() { int t; scanf("%d", &t); // Number of trips

    while (t--) {
    int money, n;
    scanf("%d %d", &money, &n); // Money and number of flavors

    int cost[n];
    for (int i = 0; i < n; i++) {
        scanf("%d", &cost[i]); // Cost of each flavor
    }

    findIceCream(money, n, cost); // Find the two distinct flavors
}

return 0;

    }