Submission #1733567

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Source Code Expand

#include<cstdio>
#include<algorithm>
#define fo(i,a,b) for(i=a;i<=b;i++)
using namespace std;
typedef long long ll;
typedef double db;
const int maxn=200+10,mo=998244353;
const db eps=1e-6;
int two[maxn],x[maxn],y[maxn];
int i,j,k,l,t,n,m,ans;
bool check(int i,int j,int k){
	if ((y[j]-y[i])*(x[k]-x[i])==(y[k]-y[i])*(x[j]-x[i])) return 1;else return 0;
}
int main(){
	scanf("%d",&n);
	two[0]=1;
	fo(i,1,n) two[i]=(ll)two[i-1]*2%mo;
	fo(i,1,n) scanf("%d%d",&x[i],&y[i]);
	ans=(two[n]-n-1)%mo;
	fo(i,1,n-1)
		fo(j,i+1,n){
			t=0;
			fo(k,j+1,n)
				if (check(i,j,k)) t++;
			(ans-=two[t])%=mo;
		}
	(ans+=mo)%=mo;
	printf("%d\n",ans);
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:15:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
                ^
./Main.cpp:18:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  fo(i,1,n) scanf("%d%d",&x[i],&y[i]);
                                     ^

Judge Result