题解

#include<iostream>
using namespace std;
int main()
{
    int n;
    cin>>n;
    int t=1,ans=0;
    while(1)
    {
        if(n>t){n-=t;ans++;t++;}
        else if(n==t&&ans%2==0){cout<<"1/"<<ans+1;break;}
        else if(n==t&&ans%2!=0){cout<<ans+1<<"/1";break;}
        else if(n<t&&ans%2!=0){cout<<ans+n-t+1<<'/'<<t-n+1;break;}
        else if(n<t&&ans%2==0){cout<<t-n+1<<'/'<<ans+n-t+1;break;}
    }
    return 0;
}