Submission #1567712

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Source Code Expand

#include <cstdio>
#include <algorithm>
using namespace std;

const int MAXN = 205;
const int MOD = 998244353;

int N;
int x[MAXN], y[MAXN];
int pot[MAXN];

void load() {
	scanf("%d", &N);
	for (int i = 0; i < N; i++)
		scanf("%d%d", x + i, y + i);
}

inline int add(int x, int y) {
	x += y;
	if (x >= MOD)	
		x -= MOD;
	else if (x < 0)
		x += MOD;
	return x;
}

int ccw(int a, int b, int c) {
	return x[a] * (y[b] - y[c]) + x[b] * (y[c] - y[a]) + x[c] * (y[a] - y[b]);
}

bool in_range(int a, int b, int c) {
	return c >= min(a, b) && c <= max(a, b);
}

int solve() {
	pot[0] = 1;
	for (int i = 1; i <= N; i++)
		pot[i] = add(pot[i - 1], pot[i - 1]);	
	
	int sol = add(pot[N], -N - 1);
	for (int i = 0; i < N; i++)
		for (int j = 0; j < i; j++) {
			int cnt = 0;
			for (int k = 0; k < N; k++)
				cnt += k != i && k != j && !ccw(i, j, k) && in_range(x[i], x[j], x[k]) && in_range(y[i], y[j], y[k]);
			sol = add(sol, -pot[cnt]);
		}
	
	return sol;
}

int main() {
	load();
	printf("%d\n", solve());
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘void load()’:
./Main.cpp:13:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &N);
                 ^
./Main.cpp:15:30: 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