Submission #690906

#	Time	Username	Problem	Language	Result	Execution time	Memory
690906		MateiKing80	Subway (info1cup19_subway)	C++17	100 / 100	7 ms	724 KiB

subway

#include <bits/stdc++.h>

using namespace std;

int main()
{
    int k,i=1;
    cin>>k;
    while(i*(i+1)/2<=k)
        i++;
    i--;
    if(i*(i+1)/2==k)
    {
        cout<<i+1<<'\n';
    cout<<0<<" "<<-1<<'\n';
        for(int j=1;j<=i;j++)
            cout<<j<<" "<<j-1<<'\n';
    }
    else
    {
        cout<<i+2<<'\n';
    cout<<0<<" "<<-1<<'\n';
        for(int j=1;j<=i;j++)
            cout<<j<<" "<<j-1<<'\n';
        cout<<i+1<<" "<<k-(i*(i+1)/2)-1;
    }
}

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