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Submission #764610

# Submission time Handle Problem Language Result Execution time Memory
764610 2023-06-23T16:27:15 Z rainboy Loop Town (CCO21_day2problem3) C
25 / 25
 881 ms 51016 KB 
/* https://oj.uz/submission/497983 (user202729) */
#include <stdio.h>

#define N	1000000
#define INF	0x3f3f3f3f3f3f3f3fLL

long long max(long long a, long long b) { return a > b ? a : b; }

unsigned int X = 12345;

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

int *zz;

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 (zz[ii[j]] == zz[i_])
				j++;
			else if (zz[ii[j]] < zz[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 ft[N * 3];

void update(int i, int n, int x) {
	while (i < n) {
		ft[i] += x;
		i |= i + 1;
	}
}

int query(int i) {
	int x = 0;

	while (i >= 0) {
		x += ft[i];
		i &= i + 1, i--;
	}
	return x;
}

int main() {
	static int xx[N], yy[N], pp[N], dd[N], ii[N]; 
	int n, h, i;
	long long cnt, ans;

	scanf("%d%*d", &n);
	for (i = 0; i < n; i++)
		scanf("%d%d", &xx[i], &yy[i]);
	for (i = 0; i < n; i++)
		ii[i] = i;
	zz = xx, sort(ii, 0, n);
	for (i = 0; i < n; i++)
		xx[ii[i]] = i;
	zz = yy, sort(ii, 0, n);
	for (i = 0; i < n; i++)
		yy[ii[i]] = i;
	for (i = 0; i < n; i++)
		pp[xx[i]] = yy[i];
	for (i = 0; i < n; i++)
		if (pp[i] < i)
			pp[i] += n;
	cnt = 0;
	for (i = 0; i < n; i++) {
		cnt += query(pp[i]) - query(pp[i] - n);
		update(pp[i], n * 3, 1);
	}
	for (i = 0; i < n; i++)
		dd[i] = pp[i] - i;
	zz = dd, sort(ii, 0, n);
	ans = cnt;
	for (h = 0; h < n; h++) {
		i = ii[h];
		update(pp[i], n * 3, -1);
		cnt += n - 1;
		cnt -= query(pp[i]) * 2;
		cnt -= (n - 1 - i - (query(n * 3 - 1) - query(n + pp[i]))) * 2;
		ans = max(ans, cnt);
		update(n + pp[i], n * 3, 1);
	}
	ans = (long long) n * (n - 1) / 2 - ans;
	printf("%lld\n", ans);
	return 0;
}

Compilation message

Main.c: In function 'main':
Main.c:60:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   60 |  scanf("%d%*d", &n);
      |  ^~~~~~~~~~~~~~~~~~
Main.c:62:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   62 |   scanf("%d%d", &xx[i], &yy[i]);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 3 ms 468 KB Output is correct
4 Correct 3 ms 540 KB Output is correct
5 Correct 3 ms 568 KB Output is correct
6 Correct 3 ms 468 KB Output is correct
7 Correct 2 ms 536 KB Output is correct
8 Correct 3 ms 468 KB Output is correct

Subtask #2
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 3 ms 468 KB Output is correct
4 Correct 3 ms 540 KB Output is correct
5 Correct 3 ms 568 KB Output is correct
6 Correct 3 ms 468 KB Output is correct
7 Correct 2 ms 536 KB Output is correct
8 Correct 3 ms 468 KB Output is correct
9 Correct 62 ms 5356 KB Output is correct
10 Correct 63 ms 5328 KB Output is correct
11 Correct 63 ms 5332 KB Output is correct
12 Correct 62 ms 5304 KB Output is correct
13 Correct 63 ms 5324 KB Output is correct
14 Correct 47 ms 5020 KB Output is correct
15 Correct 52 ms 4936 KB Output is correct
16 Correct 54 ms 4952 KB Output is correct

Subtask #3
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 3 ms 468 KB Output is correct
4 Correct 3 ms 540 KB Output is correct
5 Correct 3 ms 568 KB Output is correct
6 Correct 3 ms 468 KB Output is correct
7 Correct 2 ms 536 KB Output is correct
8 Correct 3 ms 468 KB Output is correct
9 Correct 62 ms 5356 KB Output is correct
10 Correct 63 ms 5328 KB Output is correct
11 Correct 63 ms 5332 KB Output is correct
12 Correct 62 ms 5304 KB Output is correct
13 Correct 63 ms 5324 KB Output is correct
14 Correct 47 ms 5020 KB Output is correct
15 Correct 52 ms 4936 KB Output is correct
16 Correct 54 ms 4952 KB Output is correct
17 Correct 874 ms 50928 KB Output is correct
18 Correct 871 ms 50888 KB Output is correct
19 Correct 850 ms 50888 KB Output is correct
20 Correct 875 ms 50928 KB Output is correct
21 Correct 881 ms 51016 KB Output is correct
22 Correct 869 ms 50892 KB Output is correct
23 Correct 878 ms 50888 KB Output is correct
24 Correct 632 ms 47132 KB Output is correct
25 Correct 668 ms 47004 KB Output is correct
26 Correct 683 ms 47008 KB Output is correct
27 Correct 0 ms 340 KB Output is correct
28 Correct 0 ms 340 KB Output is correct