This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
int k;
int main()
{
ios::sync_with_stdio(false);
cin.tie(0);
cin>>k;
int nod = 1;
int per = 0;
vector<pair<int,int>> rez;
rez.push_back({1,0});
while(per<k)
{
if(per+nod<=k)
{
per+=nod;
rez.push_back({nod+1,nod});
++nod;
continue;
}
rez.push_back({nod+1,k-per});
break;
}
cout<<nod+1<<'\n';
for(auto it : rez)
{
cout<<it.first-1<<' '<<it.second-1<<'\n';
}
return 0;
}
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