P1014 [NOIP1999 普及组] Cantor 表

#include <bits/stdc++.h>
using namespace std; 
int main() {int n,k=1;cin>>n;while (n>k) {n=n-k;k++;}if(k%2==0) cout<<n<<"/"<<(k+1-n);else cout<<k+1-n<<"/"<<n;return 0;
}