rk_221b
October 24, 2018, 12:47am
1
sort(arr, arr + n);

for(int i = 0; i < n-1; i++){

```
ll m=min(arr[i],arr[i+1]);
if(m<= k){
continue;
}
ll temp = m - k;
arr[i] = arr[i] - temp;
arr[i+1] = arr[i+1] - temp;
}
```

i have sorted the array and while elements are less than k continued and if min(arr[i],arr[i+1])>k then subtracted the difference and in last took sum of final array.

Can anyone help me to know my conceptual mistake.

try this test case:
n=4 k=50
100 100 150 300

correct answer is 450
your code gives 350

and also try this,
n=4 k=1
3 3 8 8
correct answer is 8

n=4 k=1
8 8 8 8

n=4 k=50
100 100 155 300
i hope,it will help.

can any one help me out in finding out corner cases for this

Reduction game:::

My Solution: CodeChef: Practical coding for everyone

incase you are unable to access above: acm_1.py - Google Drive

i am unable to find whats wrong with my approach

Try this testcase:

```
4 5
6 6 7 20
```

The answer is 35 but I think your code gives 33.

All of the above testcases is working for our solution, but still we got a WA.
Any help would be greatly appreciated.

Solution - REDUCTIONGAME

peaceh
October 24, 2018, 2:36am
6
Try this test case,
2
5 17
20 22 23 24 25
11 5
1 5 6 6 7 8 8 9 9 19 20

Ans.
92
66

This will not work for the case:

1

5 5

9 8 9 8 2

Ans: 26

As you only choose the perform subtraction on elements which are adjacent to each other and the subtraction is done directly to k not stepwise as described in question.

Correct approach:

First sort - 9 9 8 8 2

Reduce - 9 8 7 8 2

Sort - 9 8 8 7 2

Reduce - 9 7 7 7 2

Sort - 9 7 7 7 2

Reduce - 9 6 6 7 2

Sort - 9 7 6 6 2

Reduce - 9 6 5 6 2

Sort - 9 6 6 5 2

Reduce - 9 5 5 5 2

Ans = 26

can anyone who solved this question is willing to share his approach ???

yudhik
October 24, 2018, 11:06am
9
My code is available here

An important testcase:

```
4 2
4 4 4 4
Ans: 10
```

I have explained my code in comments.

PS: If their are any corrections please suggest them.

rk_221b
October 24, 2018, 1:07am
12
then what should be the approach for this problem

rk_221b
October 24, 2018, 1:18am
13
or atleast can u please explain how did we got 450 in this test case n=4 k=50 100 100 150 300

@the_extractor its passing yours one as well

rk_221b
October 24, 2018, 1:38am
15
can u please explain how did we got 35

Did you get a wrong answer or a TLE?

@the_extractor can you please convert this to question i don’t have enough reputation points to convert it to question

I think only you or a mod can convert your answer to a question.