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- #include <cstdio>
- using namespace std;
- long long aib[1000005];
- long long v[1000005];
- long long sp[1000005];
- int n;
- void update(int poz,int val)
- {
- for(;poz<=n;poz+=poz&-poz)
- {
- aib[poz]+=val;
- }
- }
- int query(int poz)
- {
- int s=0;
- for(;poz>0;poz-=poz&(-poz))
- s+=aib[poz];
- return s;
- }
- int main()
- {
- long long cnt=0;
- scanf("%lld",&n);
- for(int i=1;i<=n;++i)
- {
- scanf("%lld",&v[i]);
- }
- for(int i=n;i>=1;--i)
- {
- update(v[i],1);
- cnt+=query(v[i]-1);
- }
- printf("%lld",cnt);
- return 0;
- }
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