Submission #546702

#	Time	Username	Problem	Language	Result	Execution time	Memory
546702		alexdumitru	Subway (info1cup19_subway)	C++14	100 / 100	8 ms	724 KiB

subway

#include <bits/stdc++.h>
using namespace std;
int k,n,i;
signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin>>k;
    for(n=1;n*(n-1)/2<k;n++);
    if(n*(n-1)/2>k)
    {
        n--;
        cout<<n+1<<'\n';
        for(i=0;i<n;i++)
            cout<<i<<' '<<i-1<<'\n';
        cout<<n<<' '<<k-n*(n-1)/2-1<<'\n';
    }
    else {
        cout<<n<<'\n';
        for(i=0;i<n;i++)
            cout<<i<<' '<<i-1<<'\n';
    }
    return 0;
}

• Subtask 1: 20 / 20
• Subtask 2: 30 / 30
• Subtask 3: 50 / 50