Submission #2121363

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Source Code Expand

#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
#define INF (1<<30)
#define INFLL (1ll<<60)
#define MOD (1000000007ll)

void mul_mod(ll& a, ll b){
	a *= b;
	a %= MOD;
}

int main(void){
	ll x,t=0;
	cin >> x;
	while((t*(t+1))/2 < x){
		t++;
	}
	cout << t << endl;
	return 0;
}

Submission Info

Judge Result