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  1. Prepare
  2. Data Structures
  3. Arrays
  4. Array Manipulation
  5. Discussions

Array Manipulation

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2487 Discussions

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  • conorcasey
     + 0 comments

    tricky. Not explained very well.. KEY : prefix sum algorthim 

        arr = [0] * (n+2)

    for i in range(len(queries)):
        a = queries[i][0]
        b = queries[i][1]
        k = queries[i][2]
        arr[ a ]   += k
        arr[ b +1] -= k

    max_value = 0
    current = 0
    for val in arr:
        current += val
        max_value = max(max_value, current)

    return (max_value)

  • mkomilov6611
     + 0 comments
    function arrayManipulation(n, queries) {
    // Write your code here
    const arr = new Array(n).fill(0);
    let max = 0;
    
    for(let i = 0; i < queries.length; i++) {
        const [a,b,k] = queries[i];
        
        // -1 because arrays are indexed 0, but a & b constraints 1<=a<=b<=n
        for(let j = a - 1; j <= b - 1 ; j++) {
            arr[j] += k;

            max = Math.max(arr[j], max);
        }
    }
    
    return max;
}

  • sivaram_movva1
     + 1 comment

    public static long arrayManipulation(int n, List> queries) { long[] arr = new long[n];
    long max = 0;

        for(int i=0; i < queries.Count; i++)
    {
        int a = queries[i][0] - 1;
        int b = queries[i][1] - 1;
        int k = queries[i][2];

        for(int col=a;col<=b;col++)
        {
            arr[col] += k;
            max = Math.Max(max,arr[col]);
        }
    }

    return max;
}

  • sivaram_movva1
     + 0 comments

    public static long arrayManipulation(int n, List> queries) { long max=0; List> arr = new List>(); 

        List<long> ft = Enumerable.Repeat((long)0, n).ToList();        

    arr.Add(ft);

    for(int row=0;row<queries.Count;row++)
    {
        arr.Add(ft);

        for(int col=0;col<n;col++)
        {   
            var a=queries[row][0]-1;
            var b=queries[row][1]-1;
            var k=queries[row][2];

            if(col>=a && col<=b)
            {
                long calc=arr[row][col]+k;
                arr[row+1][col]=calc;
                max=calc>max?calc:max;
            }
            else{
                arr[row+1][col]=arr[row][col];
            }
        }

        Console.WriteLine(string.Join(" ",arr[row+1]));
    }

    return max;
}

    }

  • aminkhan84159
     + 0 comments

    Here's a solution in C#

    public static long arrayManipulation(int n, List<List<int>> queries)
    {       
        long[] arr = new long[n];
        long sum = 0;
        long max = 0;
        
        for(int i=0; i < queries.Count; i++){
            int a = queries[i][0] - 1;
            int b = queries[i][1] - 1;
            int k = queries[i][2];
            
            arr[a] += k;
            
            if(b+1 < n)
                arr[b+1] -= k;
                
        }
        
        for (int j = 0; j < arr.Length; j++){
            sum += arr[j];
            max = Math.Max(max,sum);
        }
        
        return max;
    }