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- #include <bits/stdc++.h>
- using namespace std;
- int main()
- {
- ios_base::sync_with_stdio(0);
- cin.tie(0);
- cout.tie(0);
- int a[200000],c,d,e,i,j,k,l;
- while(cin>>c)
- {
- for(i=0; i<c; i++)
- {
- cin>>a[i];
- }
- d=0;
- while(1)
- {
- e=0;
- for(i=0; i<c; i++)
- {
- if(a[i]<0)
- {
- d++;
- e=1;
- a[i]=abs(a[i]);
- if(i==0)
- {
- a[c-1]-=a[i];
- }
- else a[i-1]-=a[i];
- if(i==c-1)
- {
- a[0]-=a[i];
- }
- else a[i+1]-=a[i];
- }
- }
- if(e==0) break;
- }
- cout<<d<<endl;
- }
- return 0;
- }
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