Submission #1566594


Source Code Expand

#include <complex>
#include <vector>
#include <set>
#include <cstdio>
using namespace std;

const double EPS = 1e-12;
typedef complex<double> P;

double cross(const P& a, const P& b) {
  return imag(conj(a)*b);
}

struct L : public vector<P> {
  L(const P &a, const P &b) {
    push_back(a); push_back(b);
  }
};

bool intersectLP(const L &l, const P &p) {
  return abs(cross(l[1]-p, l[0]-p)) < EPS;
}

long long pow_binary_mod(long long x,long long y,long long M){
	long long z=1;
	for(;y;y>>=1){
		if((y&1)!=0)z=z*x%M;
		x=x*x%M;
	}
	return z;
}

int main(){
	int M=998244353;
	int N,x,y;
	scanf("%d",&N);
	vector<P>v(N);
	int r=pow_binary_mod(2,N,M);
	set<pair<int,int> >se;
	for(int i=0;i<N;i++)scanf("%d%d",&x,&y),v[i]={(double)x,(double)y};
	for(int i=0;i<N;i++)for(int j=i+1;j<N;j++){
		if(se.find({i,j})!=se.end())continue;
		L l(v[i],v[j]);
		vector<int>x={i,j};
		for(int k=0;k<N;k++)if(k!=i&&k!=j&&intersectLP(l,v[k]))x.push_back(k);
		for(int a=0;a<x.size();a++)for(int b=a+1;b<x.size();b++){
			int n=b-a-1;
			r=(r-pow_binary_mod(2,n,M))%M;
			se.emplace(x[a],x[b]);
		}
	}
	printf("%d\n",((r-N-1)%M+M)%M);
}

Submission Info

Submission Time
Task E - ConvexScore
User leafmoon
Language C++14 (GCC 5.4.1)
Score 700
Code Size 1174 Byte
Status AC
Exec Time 40 ms
Memory 1152 KB

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:36:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&N);
                ^
./Main.cpp:40:68: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  for(int i=0;i<N;i++)scanf("%d%d",&x,&y),v[i]={(double)x,(double)y};
                                                                    ^

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 700 / 700
Status
AC × 3
AC × 36
Set Name Test Cases
Sample 0_000.txt, 0_001.txt, 0_002.txt
All 0_000.txt, 0_001.txt, 0_002.txt, 1_003.txt, 1_004.txt, 1_005.txt, 1_006.txt, 1_007.txt, 1_008.txt, 1_009.txt, 1_010.txt, 1_011.txt, 1_012.txt, 1_013.txt, 1_014.txt, 1_015.txt, 1_016.txt, 1_017.txt, 1_018.txt, 1_019.txt, 1_020.txt, 1_021.txt, 1_022.txt, 1_023.txt, 1_024.txt, 1_025.txt, 1_026.txt, 1_027.txt, 1_028.txt, 1_029.txt, 1_030.txt, 1_031.txt, 1_032.txt, 1_033.txt, 1_034.txt, 1_035.txt
Case Name Status Exec Time Memory
0_000.txt AC 1 ms 256 KB
0_001.txt AC 1 ms 256 KB
0_002.txt AC 1 ms 256 KB
1_003.txt AC 1 ms 256 KB
1_004.txt AC 1 ms 256 KB
1_005.txt AC 11 ms 640 KB
1_006.txt AC 1 ms 256 KB
1_007.txt AC 13 ms 768 KB
1_008.txt AC 9 ms 640 KB
1_009.txt AC 12 ms 768 KB
1_010.txt AC 4 ms 384 KB
1_011.txt AC 16 ms 768 KB
1_012.txt AC 19 ms 896 KB
1_013.txt AC 10 ms 640 KB
1_014.txt AC 1 ms 256 KB
1_015.txt AC 4 ms 896 KB
1_016.txt AC 2 ms 512 KB
1_017.txt AC 40 ms 1152 KB
1_018.txt AC 40 ms 1152 KB
1_019.txt AC 22 ms 1152 KB
1_020.txt AC 22 ms 1152 KB
1_021.txt AC 25 ms 1152 KB
1_022.txt AC 30 ms 1152 KB
1_023.txt AC 36 ms 1152 KB
1_024.txt AC 35 ms 1152 KB
1_025.txt AC 32 ms 1152 KB
1_026.txt AC 32 ms 1152 KB
1_027.txt AC 6 ms 1152 KB
1_028.txt AC 6 ms 1152 KB
1_029.txt AC 33 ms 1152 KB
1_030.txt AC 38 ms 1152 KB
1_031.txt AC 39 ms 1152 KB
1_032.txt AC 38 ms 1152 KB
1_033.txt AC 38 ms 1152 KB
1_034.txt AC 39 ms 1152 KB
1_035.txt AC 24 ms 1152 KB