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# Count the number of operations required to reduce the given number in C++

We are given with a positive integer K and an array Ops[] which contains integers. The goal is to find the number of operations required to reduce K such that it becomes less than 0. Operations are −

First operation is K + Ops[0], first element added to K

After 1. Add Ops[i] to K until K<0. where index i keeps on changing in a circular manner. 0<=i<N. N is the number of integers in Ops[].

**Note** − Keep adding Ops[i] until K<0. If i reaches the last element Ops[N-1] then again start from i=0. In a circular manner.

We will first check if the sum of all elements of array Ops[] >0. If yes then K can never be reduced. Return -1. Otherwise keep adding Ops[i] to K and check if K<0 if yes break the loop.

Increment count of operations after addition: K+Ops[i].

Let’s understand with examples.

**Input** −

ops[]= { -4,2,-3,0,2 }, K=5

**Output** − Count of operations required to reduce a number − 3

**Explanation** − K is 5. Operations are −

1. K+ops[0]= 5+(-4) = 1 2. K+ops[1]= 1+2 = 3 3. K+ops[2]= 3+(-3) = 0

**Input** −

ops[]= { 5,5,3,-2 }, K=10

**Output** − K cannot be reduced!!

**Explanation** −K is 10. Operations are −

1. K+ops[0]= 10+5= 15 2. K+ops[1]= 15+5= 20 3. K+ops[2]= 20+3= 23 4. K+ops[3]= 23+-2= 22 5. K+ops[0]= 22+5= 27 6. K+ops[1]= 27+5=32 7. …………………

If we early check the sum of all elements of ops[]=5+5+3-2=11 and 11+10 is always +ve. So K cannot be reduced to −0.

## Approach used in the below program is as follows

We take an integer array ops[] initialized with random integers.

Variable K is given a positive value.

Function countOperations(int op[], int n, int k) takes K array Ops[] and its length as parameters and return operations required to reduce K to less than 0.

Take the initial number of operations as 0 in count.

Calculate sum of elements of ops[] and store in sum. If sum>=0 then return -1.

If not while k>0 keep adding ops[i] and increment count. If k<0 break loop.

Return count as result.

## Example

#include <bits/stdc++.h> using namespace std; long countOperations(int op[], int n, int k){ long count = 0; int sum=0; int i=0; for(int i=0;i<n;i++){ sum+=op[i]; } if(sum-k>=0) { return -1; } //number k can never be reduced as sum-k is always positive or 0 while(k>0){ for(i=0;i<n;i++){ if(k>0){ count++; k+=op[i]; } else { break; } } } return count; } int main(){ int Ops[] = { 1,-1,5,-11}; int len= sizeof(Ops) / sizeof(Ops[0]); int K=10; long ans=countOperations(Ops,len,K); if(ans==-1) { cout<<"K cannot be reduced!!"; } else { cout<<"Number of operations : "<<ans; } return 0; }

## Output

If we run the above code it will generate the following output −

Number of operations : 8

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