oj.uz

Submission #508771

# Submission time Handle Problem Language Result Execution time Memory
508771 2022-01-13T17:44:36 Z rainboy None (JOI12_constellation) C
10 / 100
 1 ms 332 KB 
/* https://ioi.te.lv/locations/ioi06/contest/day2/points/points_sol.pdf */
#include <stdio.h>

#define N	10

unsigned int X;

int rand_() {
	return (X *= 3) >> 1;
}

int xx[N], yy[N], cc[N], o;

long long cross(int i, int j, int k) {
	return (long long) (xx[j] - xx[i]) * (yy[k] - yy[i]) - (long long) (xx[k] - xx[i]) * (yy[j] - yy[i]);
}

void sort(int *ii, int l, int r) {
	while (l < r) {
		int i = l, j = l, k = r, i_ = ii[l + rand_() % (r - l)], tmp;

		while (j < k) {
			long long c = cross(o, ii[j], i_);

			if (c == 0)
				j++;
			else if (c < 0) {
				tmp = ii[i], ii[i] = ii[j], ii[j] = tmp;
				i++, j++;
			} else {
				k--;
				tmp = ii[j], ii[j] = ii[k], ii[k] = tmp;
			}
		}
		sort(ii, l, i);
		l = k;
	}
}

int main() {
	static int ii[N];
	int n, cnt, h, i, b, ans, comp;

	scanf("%d", &n);
	o = -1;
	for (i = 0; i < n; i++) {
		scanf("%d%d%d", &xx[i], &yy[i], &cc[i]), cc[i]--;
		if (o == -1 || xx[o] > xx[i] || xx[o] == xx[i] && yy[o] > yy[i])
			o = i;
		ii[i] = i;
	}
	ii[0] = o, ii[o] = 0;
	sort(ii, 1, n);
	cnt = 0;
	for (i = 0; i < n; i++) {
		while (cnt >= 2 && cross(ii[cnt - 2], ii[cnt - 1], ii[i]) >= 0)
			cnt--;
		ii[cnt++] = ii[i];
	}
	ans = 0;
	for (b = 1; b < (1 << n) - 1; b++) {
		int k;

		comp = 1;
		for (i = 0; i < n; i++)
			if (cc[i] != -1 && cc[i] != (b >> i & 1)) {
				comp = 0;
				break;
			}
		if (!comp)
			continue;
		k = 0;
		for (h = 0; h < cnt; h++)
			if ((b >> ii[h] & 1) != (b >> ii[(h + 1) % cnt] & 1))
				k++;
		if (k <= 2)
			ans++;
	}
	printf("%d\n", ans);
	return 0;
}

Compilation message

constellation.c: In function 'main':
constellation.c:48:50: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   48 |   if (o == -1 || xx[o] > xx[i] || xx[o] == xx[i] && yy[o] > yy[i])
      |                                   ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~
constellation.c:44:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   44 |  scanf("%d", &n);
      |  ^~~~~~~~~~~~~~~
constellation.c:47:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |   scanf("%d%d%d", &xx[i], &yy[i], &cc[i]), cc[i]--;
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 276 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct

Subtask #2
0.0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 332 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #3
0.0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 332 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #4
0.0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 332 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #5
0.0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 332 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #6
0.0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 332 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #7
0.0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 284 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #8
0.0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 284 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #9
0.0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 268 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #10
0.0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 272 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -