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idol Nguyễn Anh Dũng - Đắk Nông

include <bits/stdc++.h>

using namespace std;

define ll long long

int main()
{
ll n;cin >> n;
ll a[100005];
for(int i=0;i<n;i++) cin >> a[i];
ll s=0;
for(int i=0;i<n;i++)
{
s+=a[i];
cout << s << ' ';
}
}

include <bits/stdc++.h>

using namespace std;
int main(){
int n;
cin>>n;
int a[n];
for(int i=0;i<n;i++) cin>>a[i]
cout<<a[0];;
for(int i=1;i<n;i++){
cout<<a[i]+a[i-1];
}
return 0;
}

include<bits/stdc++.h>

using namespace std;
int main(){
long long n,m;
cin>>n>>m;
long long a=m-n+1;
long long int s=((a*(n+m))/2);
cout<<s;
return 0;
}

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