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