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- #include <bits/stdc++.h>
- using namespace std;
- #define ll long long
- #define test int t; cin>>t; for(int cs=1;cs<=t;cs++)
- int main()
- {
- ios_base::sync_with_stdio(0);
- cin.tie(0);cout.tie(0);
- ll n,m=0,i,j=0,k;
- cin>>n;
- map<ll,ll>x;
- x[0]=1;
- for(i=0;i<n;i++)
- {
- cin>>k;
- m+=k;
- m%=n;
- if(m<0) m+=n;
- if(x[m]) j+=x[m];
- x[m]++;
- }
- cout<<j<<endl;
- return 0;
- }
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