oj.uz

Submission #395775

# Submission time Handle Problem Language Result Execution time Memory
395775 2021-04-28T22:34:46 Z rainboy Drzava (COCI15_drzava) C++
160 / 160
 714 ms 3488 KB 
#include <math.h>
#include <stdio.h>
#include <string.h>

#define N	50000
#define K	30

unsigned int X = 12345;

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

int xx[N], yy[N], aa[N], ii[N], n, k;

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 (xx[ii[j]] == xx[i_])
				j++;
			else if (xx[ii[j]] < xx[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 zz[1 + N], ll[1 + N], rr[1 + N], ii_[1 + N], _, u_, l_, r_;

int node(int i) {
	zz[_] = rand_(), ll[_] = rr[_] = 0;
	ii_[_] = i;
	return _++;
}

void split(int u, int y, int i) {
	int c;

	if (u == 0) {
		u_ = l_ = r_ = 0;
		return;
	}
	c = yy[ii_[u]] != y ? yy[ii_[u]] - y : ii_[u] - i;
	if (c < 0) {
		split(rr[u], y, i);
		rr[u] = l_, l_ = u;
	} else if (c > 0) {
		split(ll[u], y, i);
		ll[u] = r_, r_ = u;
	} else {
		u_ = u, l_ = ll[u], r_ = rr[u];
		ll[u] = rr[u] = 0;
	}
}

int merge(int u, int v) {
	if (u == 0)
		return v;
	if (v == 0)
		return u;
	if (zz[u] < zz[v]) {
		rr[u] = merge(rr[u], v);
		return u;
	} else {
		ll[v] = merge(u, ll[v]);
		return v;
	}
}

void tr_add(int i) {
	split(u_, yy[i], i);
	u_ = merge(merge(l_, node(i)), r_);
}

void tr_remove(int i) {
	split(u_, yy[i], i);
	u_ = merge(l_, r_);
}

int ds[N];

int find(int i) {
	return ds[i] < 0 ? i : (ds[i] = find(ds[i]));
}

void join(int i, int j) {
	i = find(i);
	j = find(j);
	if (i == j)
		return;
	if (ds[i] > ds[j])
		ds[i] = j;
	else {
		if (ds[i] == ds[j])
			ds[i]--;
		ds[j] = i;
	}
}

long long d2;

int ok(int i, int j) {
	return (long long) (xx[j] - xx[i]) * (xx[j] - xx[i]) + (long long) (yy[j] - yy[i]) * (yy[j] - yy[i]) <= d2;
}

int k_;

int join1(int i, int u) {
	if (u != 0) {
		if (ok(ii_[u], i)) {
			join(ii_[u], i);
			if (--k_ == 0)
				return 1;
		}
		if (join1(i, ll[u]))
			return 1;
		if (join1(i, rr[u]))
			return 1;
	}
	return 0;
}

int join_(int i, int yl, int yr) {
	int l;

	split(u_, yl, -1), l = l_;
	split(r_, yr + 1, -1);
	k_ = k;
	if (join1(i, l_))
		return 1;
	u_ = merge(merge(l, l_), r_);
	return 0;
}

int dp_add(char *dp, int a) {
	static char dq[K];
	int s;

	memset(dq, 0, k * sizeof *dq);
	dq[a % k] = 1;
	for (s = 0; s < k; s++)
		if (dp[s])
			dq[s] = dq[(s + a) % k] = 1;
	memcpy(dp, dq, k * sizeof *dq);
	return dp[0];
}

int solve() {
	static char dp[N][K];
	int d, i, j;

	_ = 1;
	memset(ds, -1, n * sizeof *ds);
	d = sqrt(d2);
	for (i = 0, j = 0; j < n; j++) {
		int i_ = ii[j], yl, yr;

		while ((long long) (xx[i_] - xx[ii[i]]) * (xx[i_] - xx[ii[i]]) > d2)
			tr_remove(ii[i++]);
		yl = yy[i_] - d, yr = yy[i_] + d;
		while ((long long) (yy[i_] - yl) * (yy[i_] - yl) > d2)
			yl++;
		while ((long long) (yy[i_] - yl + 1) * (yy[i_] - yl + 1) <= d2)
			yl--;
		while ((long long) (yy[i_] - yr) * (yy[i_] - yr) > d2)
			yr--;
		while ((long long) (yy[i_] - yr + 1) * (yy[i_] - yr + 1) <= d2)
			yr++;
		if (join_(i_, yl, yr))
			return 1;
		tr_add(i_);
	}
	for (i = 0; i < n; i++)
		if (ds[i] < 0)
			memset(dp[i], 0, k * sizeof *dp[i]);
	for (i = 0; i < n; i++)
		if (dp_add(dp[find(i)], aa[i]))
			return 1;
	return 0;
}

int main() {
	int i;
	long long lower, upper;

	scanf("%d%d", &n, &k);
	for (i = 0; i < n; i++)
		scanf("%d%d%d", &xx[i], &yy[i], &aa[i]);
	for (i = 0; i < n; i++)
		ii[i] = i;
	sort(ii, 0, n);
	lower = 0, upper = 20000000000000000;
	while (upper - lower > 1) {
		d2 = (lower + upper) / 2;
		if (solve())
			upper = d2;
		else
			lower = d2;
	}
	printf("%.3f\n", sqrt(upper));
	return 0;
}

Compilation message

drzava.cpp: In function 'int main()':
drzava.cpp:193:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  193 |  scanf("%d%d", &n, &k);
      |  ~~~~~^~~~~~~~~~~~~~~~
drzava.cpp:195:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  195 |   scanf("%d%d%d", &xx[i], &yy[i], &aa[i]);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct

Subtask #3
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 8 ms 352 KB Output is correct

Subtask #4
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 6 ms 332 KB Output is correct

Subtask #5
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 4 ms 332 KB Output is correct

Subtask #6
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 6 ms 332 KB Output is correct

Subtask #7
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 6 ms 332 KB Output is correct

Subtask #8
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 6 ms 356 KB Output is correct

Subtask #9
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 127 ms 1712 KB Output is correct

Subtask #10
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 675 ms 3424 KB Output is correct

Subtask #11
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 714 ms 3464 KB Output is correct

Subtask #12
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 571 ms 3300 KB Output is correct

Subtask #13
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 611 ms 3488 KB Output is correct

Subtask #14
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 208 KB Output is correct
2 Correct 586 ms 3484 KB Output is correct

Subtask #15
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 399 ms 3484 KB Output is correct

Subtask #16
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 442 ms 3484 KB Output is correct

Subtask #17
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 363 ms 3484 KB Output is correct

Subtask #18
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 382 ms 3416 KB Output is correct

Subtask #19
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 435 ms 3484 KB Output is correct

Subtask #20
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 394 ms 3488 KB Output is correct