oj.uz

Submission #944563

# Submission time Handle Problem Language Result Execution time Memory
944563 2024-03-13T00:17:37 Z rainboy 전봇대 (KOI13_pole) C
100 / 100
 12 ms 2476 KB 
#include <stdio.h>

#define N	100000

long long abs_(long long a) { return a > 0 ? a : -a; }
long long min(long long a, long long b) { return a < b ? a : b; }

unsigned int X = 12345;

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

int tt[N];

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)
			if (tt[ii[j]] == tt[i_])
				j++;
			else if (tt[ii[j]] < tt[i_]) {
				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 xx[N], ii[N];
	int n, i, t;
	long long a, ans1, ans2;

	scanf("%d", &n);
	if (n == 1) {
		printf("0\n");
		return 0;
	}
	for (i = 0; i < n; i++)
		scanf("%d", &xx[i]);
	for (i = 1; i < n; i++)
		xx[i] -= xx[0];
	for (i = 1; i < n; i++)
		tt[i] = xx[i] / i;
	for (i = 1; i < n; i++)
		ii[i] = i;
	sort(ii, 1, n);
	a = (long long) n * (n - 1) / 2, t = 0;
	for (i = 1; i < n; i++)
		if ((a -= ii[i] * 2) <= 0) {
			t = tt[ii[i]];
			break;
		}
	ans1 = 0;
	for (i = 1; i < n; i++)
		ans1 += abs_(xx[i] - (long long) t * i);
	ans2 = 0;
	for (i = 1; i < n; i++)
		ans2 += abs_(xx[i] - (long long) (t + 1) * i);
	printf("%lld\n", min(ans1, ans2));
	return 0;
}

Compilation message

pole.c: In function 'main':
pole.c:40:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 |  scanf("%d", &n);
      |  ^~~~~~~~~~~~~~~
pole.c:46:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |   scanf("%d", &xx[i]);
      |   ^~~~~~~~~~~~~~~~~~~

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct

Subtask #2
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct

Subtask #3
31.0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 512 KB Output is correct
2 Correct 2 ms 444 KB Output is correct
3 Correct 2 ms 604 KB Output is correct
4 Correct 2 ms 604 KB Output is correct
5 Correct 3 ms 604 KB Output is correct
6 Correct 3 ms 604 KB Output is correct

Subtask #4
37.0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 1368 KB Output is correct
2 Correct 10 ms 2396 KB Output is correct
3 Correct 12 ms 2476 KB Output is correct
4 Correct 10 ms 2392 KB Output is correct
5 Correct 12 ms 2396 KB Output is correct
6 Correct 11 ms 2272 KB Output is correct