Submission #1595270

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Source Code Expand

#include<bits/stdc++.h>
#include<ctime>
#include<random>
using namespace std;

int n;
vector<pair<int, int> > v;

bool use[202];
long long int p2[202];
#define MOD 998244353
int main(){
	p2[0] = 1;
	for (int i = 1; i < 202; i++){
		p2[i] = p2[i - 1];
		p2[i] *= 2;
		if (p2[i] >= MOD){
			p2[i] %= MOD;
		}
	}
	cin >> n;
	for (int i = 0; i < n; i++){
		int a, b;
		scanf("%d%d", &a, &b);
		v.push_back(make_pair(a, b));
	}
	long long int ng = 0;
	for (int i = 0; i < n; i++){
		ng++;
		memset(use, false, sizeof(use));
		for (int j = i + 1; j < n; j++){
			int cnt = 1;
			if (use[j])continue;
			use[j] = true;
			pair<long long int, long long int> vec = make_pair(v[j].first - v[i].first, v[j].second - v[i].second);
			for (int k = j+1; k < n; k++){
				pair<long long int, long long int> vec2 = make_pair(v[k].first - v[i].first, v[k].second - v[i].second);
				if (vec.first*vec2.second == vec.second*vec2.first){
					use[k] = true;
					cnt++;
				}
			}
			long long int way = p2[cnt];
			way += MOD - 1;
			if (way >= MOD)way %= MOD;
			ng += way;
			if (ng >= MOD)ng %= MOD;
		}
	}
	long long int ALL = p2[n] + MOD - 1 + MOD - ng;
	ALL %= MOD;
	printf("%lld\n", ALL);
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:24:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &a, &b);
                        ^

Judge Result