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- #include<bits/stdc++.h>
- using namespace std;
- int main()
- {
- int n;
- while(scanf("%d",&n)!=EOF)
- {
- int a[n+1];
- for(int i=0;i<n;i++)
- scanf("%d",&a[i]);
- int cnt=0;
- while(1)
- {
- int p=0;
- for(int i=0;i<n;i++)
- {
- if(i==0 && a[i]<0)
- {
- a[i]=abs(a[i]);
- a[i+1]-=a[i];
- a[n-1]-=a[i];
- cnt++;
- break;
- }
- else if(i==n-1 && a[i]<0)
- {
- a[i]=abs(a[i]);
- a[i-1]-=a[i];
- a[0]-=a[i];
- cnt++;
- break;
- }
- else if(a[i]<0)
- {
- a[i]=abs(a[i]);
- a[i+1]-=a[i];
- a[i-1]-=a[i];
- cnt++;
- break;
- }
- else
- p++;
- }
- if(p==n)
- break;
- }
- printf("%d\n",cnt);
- }
- }
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