Submission #1565532

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Source Code Expand

#include <cstdio>
#include <algorithm>
using namespace std;
const int maxn=201;
typedef long long LL;
const LL mod=998244353;

int n,x[maxn],y[maxn];
LL ans;
bool f;

LL pw(int p)
{
	if (p==1) return 2ll;
	LL ans=pw(p/2);
	if (p%2) return (ans*ans*2ll)%mod;
	else return (ans*ans)%mod;
}

bool line(int p,int q,int r)
{
	return (y[q]-y[p])*(x[r]-x[q])==(y[r]-y[q])*(x[q]-x[p]);
}

int main()
{
	scanf("%d",&n);
	for(int i=1;i<=n;i++) 
		scanf("%d%d",&x[i],&y[i]);
	ans=(pw(n)-1ll-(LL)n-(LL)n*(n-1)/2)%mod;
	
	for(int i=1;i<n;i++)
	{
		for(int j=i+1;j<n;j++)
		{
			f=true;
			for(int k=1;k<j;k++)
				if (k!=i && line(i,j,k))
				{
					f=false;
					break;
				}
			if (!f) continue;
			
			int cnt=2;
			for(int k=j+1;k<=n;k++)
				if (line(i,j,k)) cnt++;
			LL tmp=(pw(cnt)-1ll-(LL)cnt-(LL)cnt*(cnt-1)/2)%mod;
			ans-=tmp;
		}
	}
	
	ans=(ans%mod+mod)%mod;
	printf("%I64d\n",ans);
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:54:22: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘LL {aka long long int}’ [-Wformat=]
  printf("%I64d\n",ans);
                      ^
./Main.cpp:27:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
                ^
./Main.cpp:29:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&x[i],&y[i]);
                            ^

Judge Result