//Believe in yourself ,( try and try and then try ), You can do it
//You don't have to be great to start but you have to start to be great
#include <iostream>
#include<algorithm>
#include<cmath>
#include<string>
#include<vector>
#include <utility>
#include <stack>
#include <set>
#include <map>
#include<queue>
#include<set>
// 2D vector vector<vector<int>>v(n,vector<int>(m));
// sort and reverse in vector sort(v.begin(), v.end(), greater<int>());
// str.erase(pos,len); erase in string
// a = s.substr(0, i)<<before i, b = s.substr(i)<<from i to end;
// cout << (v[0] == 1 ? "YES" : "NO") << endl;
// unsigned long long int
// priority_queue<ll, vector<ll>, greater<ll>> p;
using namespace std;
#define ll long long
#define all(c) c.begin(),c.end()
ll gcd(ll a, ll b)
{
while (b != 0)
{
ll a2 = a;
a = b; b = a2 % b;
}
return a;
}
ll lcm(ll a, ll b)
{
return a / gcd(a, b) * b;
}
void soso()
{
ios::sync_with_stdio(0);
cin.tie(NULL);
cout.tie(NULL);
}
ll tri[200005];
int main()
{
soso();
for (int i = 1; i <= 100005; i++)
{
tri[i] = (i * (i + 1)) / 2;
}
}
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