Submission #1734937

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Source Code Expand

#include<set>
#include<map>
#include<deque>
#include<queue>
#include<stack>
#include<cmath>
#include<ctime>
#include<bitset>
#include<string>
#include<vector>
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<climits>
#include<complex>
#include<iostream>
#include<algorithm>
#define ll long long
using namespace std;

ll n;
bool check(ll x){return x*(x+1)/2ll<=n;}

int main()
{
	scanf("%lld",&n);
	ll l=1,r=100000;
	while(l<=r)
	{
		ll mid=l+r>>1;
		if(check(mid)) l=mid+1;
		else r=mid-1;
	}ll k=l-1; ll now=k*(k+1ll)/2;
	return printf("%lld\n",k+(now!=n?1:0)),0;
	
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:26:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld",&n);
                  ^

Judge Result