坐标与图形

https://codeforces.com/contest/2072/problem/E

#include<bits/stdc++.h>
using namespace std;

#define endl '\n'
using ll = long long;
using pii = pair<int, int>;
const double PI = acos(-1);
const int N =550;
const int mod = 1e9 + 7;
int sum[N];
void solve(){
	int k;cin>>k;
	vector<int> v;
	int cnt=0;
	while(k>0){
		int n=1;
		while((n)*(n+1)/2<=k){
			n++;
		}
		v.push_back(n);
		cnt+=n;
		k-=n*(n-1)/2;
	}
	cout<<cnt<<endl;
	int x=0;
	for(int i=0;i<v.size();i++){
		for(int j=0;j<v[i];j++){
			cout<<x<<" "<<i<<endl;
			x++;
		}
	}
}
int main() {
	
	ios::sync_with_stdio(false);
	cin.tie(nullptr), cout.tie(nullptr);
	
	int T = 1;
    cin>>T;
	while (T--) {
		solve();
	}
	
	return 0;
}