#include #define rep(i,a,b) for(int i=a;i<(b);++i) #define erep(i,a,b) for(int i=a;i<=(int)(b);++i) #define per(i,a,b) for(int i=(a);i>(b);--i) #define eper(i,a,b) for(int i=(a);i>=b;--i) #define pb push_back #define mp make_pair #define INF (1<<31)-1 #define MOD 1000000007 #define all(x) (x).begin(),(x).end() #define vii vector #define vll vector using namespace std; typedef long long ll; typedef pair Pii; templatebool chmax(T &a, const T &b) { if (abool chmin(T &a, const T &b) { if (b> n; ll l = 0, r = 2*1e9+1LL; while (r - l > 1) { ll mid = (r + l) / 2; if (mid * (mid + 1) / 2== n) { cout << "YES" << endl; cout << mid << endl; return 0; } else if (mid * (mid + 1) / 2 < n) l = mid; else r = mid; } cout << "NO" << endl; return 0; }