oj.uz

Submission #725687

# Submission time Handle Problem Language Result Execution time Memory
725687 2023-04-17T21:34:03 Z GusterGoose27 Wild Boar (JOI18_wild_boar) C++17
12 / 100
 137 ms 50236 KB 
#include <bits/stdc++.h>

#define int ll

using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, bool> plb;
typedef pair<ll, int> pli;

const int MAXN = 2000;
const int MAXM = 12000;
const int MAX_PATH = 1e5;
const ll inf = 1e15;

class path {
public:
	ll len;
	int s, e;
	path(ll l, int s, int e) : len(l), s(s), e(e) {}
	path() {}
};

vector<int> edges[MAXN];
pii init_edge[2*MAXN]; // dest, weight
vector<int> dual[MAXM];
int ecount = 0;

int make_edge() {
	return (ecount++);
}

path dist[MAXN][MAXN][5]; // 0 : normal, 1 : first diff, 2 : f/e, 3 : e, 4 : e/f
ll edge_dist[2*MAXN][2*MAXN];
bool vis[MAXM]; // bitset?
int seq[MAX_PATH];
int n, m, t, l;

path min(path a, path b) {
	if (a.len <= b.len) return a;
	return b;
}

path comb(path a, path b) {
	assert(a.e != b.s);
	if (a.len == inf || b.len == inf) return path(inf, -1, -10);
	return path(a.len+b.len, a.s, b.e);
}

class stree {
public:
	int lp, rp;
	stree *l = nullptr;
	stree *r = nullptr;
	path seg[5];
	stree(int lv, int rv) {
		lp = lv;
		rp = rv;
		if (lp < rp) {
			int mid = (lp+rp)/2;
			l = new stree(lp, mid);
			r = new stree(mid+1, rp);
		}
		make();
	}
	int rdiff(int a) {
		if (a == 0) return 3;
		return 2;
	}
	void avoid(path seg[], int s, int e, int &a) { // best path avoiding these things
		if (seg[a].s == s) a = 1;
		if (seg[a].e == e) a = rdiff(a);
		if (seg[a].s == s) a++;
	}
	void make() { // really slow. Could probably be faster
		if (lp == rp) {
			for (int i = 0; i < 5; i++) seg[i] = dist[seq[lp]][seq[lp+1]][i];
			return;
		}
		for (int i = 0; i < 5; i++) {
			int a = 0, b = 0;
			int lv = -2, rv = -2;
			if (i == 1 || i == 2) lv = seg[0].s;
			if (i == 4) lv = seg[3].s;
			if (i == 2) rv = seg[1].e;
			if (i == 3 || i == 4) rv = seg[0].e;
			avoid(l->seg, lv, -2, a);
			avoid(r->seg, l->seg[a].e, rv, b);
			seg[i] = comb(l->seg[a], r->seg[b]);
			a = 0, b = 0;
			avoid(r->seg, -2, rv, b);
			avoid(l->seg, lv, r->seg[b].s, a);
			seg[i] = min(seg[i], comb(l->seg[a], r->seg[b]));
		}
	}
	void upd(int p) {
		if (lp > p || rp < p) return;
		if (lp == rp) return make();
		l->upd(p);
		r->upd(p);
		make();
	}
};

stree *tree;

void dijkstra(int s) {
	fill(edge_dist[s], edge_dist[s]+2*m, inf);
	fill(vis, vis+MAXM, 0); // could optimize by expanding dists to make pq smaller
	priority_queue<pli, vector<pli>, greater<pli>> pq;
	pq.push(pli(init_edge[s].second, s));
	while (!pq.empty()) {
		pli tp = pq.top();
		pq.pop();
		if (vis[tp.second]) continue;
		if (tp.second < 2*m) edge_dist[s][tp.second] = tp.first;
		vis[tp.second] = 1;
		for (int nxt: dual[tp.second]) {
			if (vis[nxt]) continue;
			ll ndist = tp.first+((nxt<2*m) ? init_edge[nxt].second : 0);
			pq.push(pli(ndist, nxt));
		}
	}
}

path make_opt(int i, int j, int s, int e) {
	path best(inf, -1, -10);
	for (int a: edges[i]) {
		if (a == s) continue;
		for (int b: edges[j]) {
			if (b == e) continue;
			best = min(best, path(edge_dist[a][b^1], a, b));
		}
	}
	return best;
}

signed main() {
	ios_base::sync_with_stdio(false); cin.tie(NULL);
	cin >> n >> m >> t >> l;
	for (int i = 0; i < m; i++) {
		int a, b, c;
		cin >> a >> b >> c; a--; b--;
		init_edge[2*i] = pii(b, c);
		init_edge[2*i+1] = pii(a, c);
		edges[a].push_back(make_edge());
		edges[b].push_back(make_edge());
	}
	for (int i = 0; i < n; i++) {
		vector<int> pref;
		vector<int> suf;
		for (int j = 0; j < edges[i].size(); j++) {
			pref.push_back(make_edge());
			dual[pref.back()].push_back(edges[i][j]);
		}
		for (int j = 0; j < edges[i].size(); j++) {
			suf.push_back(make_edge());
			dual[suf.back()].push_back(edges[i][j]);
		}
		for (int j = 1; j < edges[i].size(); j++) {
			dual[pref[j]].push_back(pref[j-1]);
			dual[suf[j-1]].push_back(suf[j]);
		}
		for (int j = 0; j < edges[i].size(); j++) {
			if (j)dual[edges[i][j]^1].push_back(pref[j-1]);
			if (j<edges[i].size()-1)dual[edges[i][j]^1].push_back(suf[j+1]);
		}
	}
	for (int i = 0; i < 2*m; i++) dijkstra(i); // much cleaner?
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < n; j++) {
			dist[i][j][0] = make_opt(i, j, -5, -5);
			dist[i][j][1] = make_opt(i, j, dist[i][j][0].s, -5);
			dist[i][j][2] = make_opt(i, j, dist[i][j][0].s, dist[i][j][1].e);
			dist[i][j][3] = make_opt(i, j, -5, dist[i][j][0].e);
			dist[i][j][4] = make_opt(i, j, dist[i][j][3].s, dist[i][j][0].e);
		}
	}
	for (int i = 0; i < l; i++) {
		cin >> seq[i];
		seq[i]--;
	}
	tree = new stree(0, l-2);
	for (int i = 0; i < t; i++) {
		int x, v; cin >> x >> v;
		x--; v--;
		seq[x] = v;
		if (x) tree->upd(x-1);
		if (x < l-1) tree->upd(x);
		if (tree->seg[0].len == inf) cout << "-1\n";
		else cout << tree->seg[0].len << "\n";
	}
	return 0;
}

Compilation message

wild_boar.cpp: In function 'int main()':
wild_boar.cpp:152:21: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  152 |   for (int j = 0; j < edges[i].size(); j++) {
      |                   ~~^~~~~~~~~~~~~~~~~
wild_boar.cpp:156:21: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  156 |   for (int j = 0; j < edges[i].size(); j++) {
      |                   ~~^~~~~~~~~~~~~~~~~
wild_boar.cpp:160:21: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  160 |   for (int j = 1; j < edges[i].size(); j++) {
      |                   ~~^~~~~~~~~~~~~~~~~
wild_boar.cpp:164:21: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  164 |   for (int j = 0; j < edges[i].size(); j++) {
      |                   ~~^~~~~~~~~~~~~~~~~
wild_boar.cpp:166:9: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  166 |    if (j<edges[i].size()-1)dual[edges[i][j]^1].push_back(suf[j+1]);
      |        ~^~~~~~~~~~~~~~~~~~

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 724 KB Output is correct
2 Correct 1 ms 792 KB Output is correct
3 Correct 1 ms 724 KB Output is correct
4 Correct 1 ms 724 KB Output is correct
5 Correct 1 ms 724 KB Output is correct
6 Correct 1 ms 724 KB Output is correct
7 Correct 1 ms 724 KB Output is correct
8 Correct 1 ms 724 KB Output is correct
9 Correct 1 ms 724 KB Output is correct
10 Correct 1 ms 788 KB Output is correct
11 Correct 1 ms 784 KB Output is correct
12 Correct 1 ms 724 KB Output is correct
13 Correct 1 ms 724 KB Output is correct
14 Correct 1 ms 724 KB Output is correct
15 Correct 1 ms 784 KB Output is correct
16 Correct 1 ms 724 KB Output is correct
17 Correct 1 ms 724 KB Output is correct
18 Correct 1 ms 724 KB Output is correct
19 Correct 1 ms 788 KB Output is correct
20 Correct 1 ms 724 KB Output is correct
21 Correct 1 ms 724 KB Output is correct
22 Correct 1 ms 788 KB Output is correct
23 Correct 1 ms 784 KB Output is correct
24 Correct 1 ms 724 KB Output is correct
25 Correct 1 ms 788 KB Output is correct

Subtask #2
0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 724 KB Output is correct
2 Correct 1 ms 792 KB Output is correct
3 Correct 1 ms 724 KB Output is correct
4 Correct 1 ms 724 KB Output is correct
5 Correct 1 ms 724 KB Output is correct
6 Correct 1 ms 724 KB Output is correct
7 Correct 1 ms 724 KB Output is correct
8 Correct 1 ms 724 KB Output is correct
9 Correct 1 ms 724 KB Output is correct
10 Correct 1 ms 788 KB Output is correct
11 Correct 1 ms 784 KB Output is correct
12 Correct 1 ms 724 KB Output is correct
13 Correct 1 ms 724 KB Output is correct
14 Correct 1 ms 724 KB Output is correct
15 Correct 1 ms 784 KB Output is correct
16 Correct 1 ms 724 KB Output is correct
17 Correct 1 ms 724 KB Output is correct
18 Correct 1 ms 724 KB Output is correct
19 Correct 1 ms 788 KB Output is correct
20 Correct 1 ms 724 KB Output is correct
21 Correct 1 ms 724 KB Output is correct
22 Correct 1 ms 788 KB Output is correct
23 Correct 1 ms 784 KB Output is correct
24 Correct 1 ms 724 KB Output is correct
25 Correct 1 ms 788 KB Output is correct
26 Correct 2 ms 1236 KB Output is correct
27 Correct 36 ms 35816 KB Output is correct
28 Correct 35 ms 35812 KB Output is correct
29 Correct 137 ms 40008 KB Output is correct
30 Correct 127 ms 39832 KB Output is correct
31 Correct 132 ms 39920 KB Output is correct
32 Correct 129 ms 39852 KB Output is correct
33 Correct 120 ms 41664 KB Output is correct
34 Correct 124 ms 41648 KB Output is correct
35 Correct 125 ms 41600 KB Output is correct
36 Correct 113 ms 41552 KB Output is correct
37 Correct 121 ms 41724 KB Output is correct
38 Correct 116 ms 44028 KB Output is correct
39 Correct 101 ms 43852 KB Output is correct
40 Correct 106 ms 44016 KB Output is correct
41 Correct 113 ms 43928 KB Output is correct
42 Correct 89 ms 45512 KB Output is correct
43 Correct 100 ms 46908 KB Output is correct
44 Correct 96 ms 46920 KB Output is correct
45 Incorrect 62 ms 50236 KB Output isn't correct
46 Halted 0 ms 0 KB -

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 724 KB Output is correct
2 Correct 1 ms 792 KB Output is correct
3 Correct 1 ms 724 KB Output is correct
4 Correct 1 ms 724 KB Output is correct
5 Correct 1 ms 724 KB Output is correct
6 Correct 1 ms 724 KB Output is correct
7 Correct 1 ms 724 KB Output is correct
8 Correct 1 ms 724 KB Output is correct
9 Correct 1 ms 724 KB Output is correct
10 Correct 1 ms 788 KB Output is correct
11 Correct 1 ms 784 KB Output is correct
12 Correct 1 ms 724 KB Output is correct
13 Correct 1 ms 724 KB Output is correct
14 Correct 1 ms 724 KB Output is correct
15 Correct 1 ms 784 KB Output is correct
16 Correct 1 ms 724 KB Output is correct
17 Correct 1 ms 724 KB Output is correct
18 Correct 1 ms 724 KB Output is correct
19 Correct 1 ms 788 KB Output is correct
20 Correct 1 ms 724 KB Output is correct
21 Correct 1 ms 724 KB Output is correct
22 Correct 1 ms 788 KB Output is correct
23 Correct 1 ms 784 KB Output is correct
24 Correct 1 ms 724 KB Output is correct
25 Correct 1 ms 788 KB Output is correct
26 Correct 2 ms 1236 KB Output is correct
27 Correct 36 ms 35816 KB Output is correct
28 Correct 35 ms 35812 KB Output is correct
29 Correct 137 ms 40008 KB Output is correct
30 Correct 127 ms 39832 KB Output is correct
31 Correct 132 ms 39920 KB Output is correct
32 Correct 129 ms 39852 KB Output is correct
33 Correct 120 ms 41664 KB Output is correct
34 Correct 124 ms 41648 KB Output is correct
35 Correct 125 ms 41600 KB Output is correct
36 Correct 113 ms 41552 KB Output is correct
37 Correct 121 ms 41724 KB Output is correct
38 Correct 116 ms 44028 KB Output is correct
39 Correct 101 ms 43852 KB Output is correct
40 Correct 106 ms 44016 KB Output is correct
41 Correct 113 ms 43928 KB Output is correct
42 Correct 89 ms 45512 KB Output is correct
43 Correct 100 ms 46908 KB Output is correct
44 Correct 96 ms 46920 KB Output is correct
45 Incorrect 62 ms 50236 KB Output isn't correct
46 Halted 0 ms 0 KB -

Subtask #4
0 / 38.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 724 KB Output is correct
2 Correct 1 ms 792 KB Output is correct
3 Correct 1 ms 724 KB Output is correct
4 Correct 1 ms 724 KB Output is correct
5 Correct 1 ms 724 KB Output is correct
6 Correct 1 ms 724 KB Output is correct
7 Correct 1 ms 724 KB Output is correct
8 Correct 1 ms 724 KB Output is correct
9 Correct 1 ms 724 KB Output is correct
10 Correct 1 ms 788 KB Output is correct
11 Correct 1 ms 784 KB Output is correct
12 Correct 1 ms 724 KB Output is correct
13 Correct 1 ms 724 KB Output is correct
14 Correct 1 ms 724 KB Output is correct
15 Correct 1 ms 784 KB Output is correct
16 Correct 1 ms 724 KB Output is correct
17 Correct 1 ms 724 KB Output is correct
18 Correct 1 ms 724 KB Output is correct
19 Correct 1 ms 788 KB Output is correct
20 Correct 1 ms 724 KB Output is correct
21 Correct 1 ms 724 KB Output is correct
22 Correct 1 ms 788 KB Output is correct
23 Correct 1 ms 784 KB Output is correct
24 Correct 1 ms 724 KB Output is correct
25 Correct 1 ms 788 KB Output is correct
26 Correct 2 ms 1236 KB Output is correct
27 Correct 36 ms 35816 KB Output is correct
28 Correct 35 ms 35812 KB Output is correct
29 Correct 137 ms 40008 KB Output is correct
30 Correct 127 ms 39832 KB Output is correct
31 Correct 132 ms 39920 KB Output is correct
32 Correct 129 ms 39852 KB Output is correct
33 Correct 120 ms 41664 KB Output is correct
34 Correct 124 ms 41648 KB Output is correct
35 Correct 125 ms 41600 KB Output is correct
36 Correct 113 ms 41552 KB Output is correct
37 Correct 121 ms 41724 KB Output is correct
38 Correct 116 ms 44028 KB Output is correct
39 Correct 101 ms 43852 KB Output is correct
40 Correct 106 ms 44016 KB Output is correct
41 Correct 113 ms 43928 KB Output is correct
42 Correct 89 ms 45512 KB Output is correct
43 Correct 100 ms 46908 KB Output is correct
44 Correct 96 ms 46920 KB Output is correct
45 Incorrect 62 ms 50236 KB Output isn't correct
46 Halted 0 ms 0 KB -