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답안 #724728

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
724728 2023-04-15T19:39:00 Z GusterGoose27 Wild Boar (JOI18_wild_boar) C++17
12 / 100
 136 ms 36768 KB 
#include <bits/stdc++.h>

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, -2);
	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));
		}
	}
}

int 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] = path(inf, -1, -2);
			for (int a: edges[i]) {
				for (int b: edges[j]) {
					dist[i][j][0] = min(dist[i][j][0], path(edge_dist[a][b^1], a, b));
				}
			}
			// 1
			dist[i][j][1] = path(inf, -1, -2);
			for (int a: edges[i]) {
				if (a == dist[i][j][0].s) continue;
				for (int b: edges[j]) {
					dist[i][j][1] = min(dist[i][j][1], path(edge_dist[a][b^1], a, b));
				}
			}
			// 2
			dist[i][j][2] = path(inf, -1, -2);
			for (int a: edges[i]) {
				if (a == dist[i][j][0].s) continue;
				for (int b: edges[j]) {
					if (b == dist[i][j][1].e) continue;
					dist[i][j][2] = min(dist[i][j][2], path(edge_dist[a][b^1], a, b));
				}
			}
			// 3
			dist[i][j][3] = path(inf, -1, -2);
			for (int a: edges[i]) {
				for (int b: edges[j]) {
					if (b == dist[i][j][0].e) continue;
					dist[i][j][3] = min(dist[i][j][3], path(edge_dist[a][b^1], a, b));
				}
			}
			// 4
			dist[i][j][4] = path(inf, -1, -2);
			for (int a: edges[i]) {
				if (a == dist[i][j][3].s) continue;
				for (int b: edges[j]) {
					if (b == dist[i][j][0].e) continue;
					dist[i][j][4] = min(dist[i][j][4], path(edge_dist[a][b^1], a, b));
				}
			}
		}
	}
	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:138:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  138 |   for (int j = 0; j < edges[i].size(); j++) {
      |                   ~~^~~~~~~~~~~~~~~~~
wild_boar.cpp:142:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  142 |   for (int j = 0; j < edges[i].size(); j++) {
      |                   ~~^~~~~~~~~~~~~~~~~
wild_boar.cpp:146:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  146 |   for (int j = 1; j < edges[i].size(); j++) {
      |                   ~~^~~~~~~~~~~~~~~~~
wild_boar.cpp:150:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  150 |   for (int j = 0; j < edges[i].size(); j++) {
      |                   ~~^~~~~~~~~~~~~~~~~
wild_boar.cpp:152:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  152 |    if (j<edges[i].size()-1)dual[edges[i][j]^1].push_back(suf[j+1]);
      |        ~^~~~~~~~~~~~~~~~~~

Subtask #1
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 672 KB Output is correct
2 Correct 1 ms 724 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 800 KB Output is correct
11 Correct 2 ms 724 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 800 KB Output is correct
16 Correct 1 ms 724 KB Output is correct
17 Correct 1 ms 800 KB Output is correct
18 Correct 1 ms 724 KB Output is correct
19 Correct 1 ms 724 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 724 KB Output is correct
23 Correct 1 ms 664 KB Output is correct
24 Correct 1 ms 664 KB Output is correct
25 Correct 1 ms 724 KB Output is correct

Subtask #2
0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 672 KB Output is correct
2 Correct 1 ms 724 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 800 KB Output is correct
11 Correct 2 ms 724 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 800 KB Output is correct
16 Correct 1 ms 724 KB Output is correct
17 Correct 1 ms 800 KB Output is correct
18 Correct 1 ms 724 KB Output is correct
19 Correct 1 ms 724 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 724 KB Output is correct
23 Correct 1 ms 664 KB Output is correct
24 Correct 1 ms 664 KB Output is correct
25 Correct 1 ms 724 KB Output is correct
26 Correct 3 ms 1108 KB Output is correct
27 Correct 32 ms 25576 KB Output is correct
28 Correct 33 ms 25596 KB Output is correct
29 Correct 136 ms 29676 KB Output is correct
30 Correct 127 ms 29524 KB Output is correct
31 Correct 123 ms 29516 KB Output is correct
32 Correct 127 ms 29564 KB Output is correct
33 Correct 128 ms 30816 KB Output is correct
34 Correct 120 ms 30796 KB Output is correct
35 Correct 107 ms 30668 KB Output is correct
36 Correct 115 ms 30692 KB Output is correct
37 Correct 117 ms 30884 KB Output is correct
38 Correct 119 ms 32400 KB Output is correct
39 Correct 96 ms 32296 KB Output is correct
40 Correct 110 ms 32428 KB Output is correct
41 Correct 105 ms 32444 KB Output is correct
42 Correct 85 ms 33500 KB Output is correct
43 Correct 93 ms 34420 KB Output is correct
44 Correct 91 ms 34472 KB Output is correct
45 Incorrect 54 ms 36768 KB Output isn't correct
46 Halted 0 ms 0 KB -

Subtask #3
0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 672 KB Output is correct
2 Correct 1 ms 724 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 800 KB Output is correct
11 Correct 2 ms 724 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 800 KB Output is correct
16 Correct 1 ms 724 KB Output is correct
17 Correct 1 ms 800 KB Output is correct
18 Correct 1 ms 724 KB Output is correct
19 Correct 1 ms 724 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 724 KB Output is correct
23 Correct 1 ms 664 KB Output is correct
24 Correct 1 ms 664 KB Output is correct
25 Correct 1 ms 724 KB Output is correct
26 Correct 3 ms 1108 KB Output is correct
27 Correct 32 ms 25576 KB Output is correct
28 Correct 33 ms 25596 KB Output is correct
29 Correct 136 ms 29676 KB Output is correct
30 Correct 127 ms 29524 KB Output is correct
31 Correct 123 ms 29516 KB Output is correct
32 Correct 127 ms 29564 KB Output is correct
33 Correct 128 ms 30816 KB Output is correct
34 Correct 120 ms 30796 KB Output is correct
35 Correct 107 ms 30668 KB Output is correct
36 Correct 115 ms 30692 KB Output is correct
37 Correct 117 ms 30884 KB Output is correct
38 Correct 119 ms 32400 KB Output is correct
39 Correct 96 ms 32296 KB Output is correct
40 Correct 110 ms 32428 KB Output is correct
41 Correct 105 ms 32444 KB Output is correct
42 Correct 85 ms 33500 KB Output is correct
43 Correct 93 ms 34420 KB Output is correct
44 Correct 91 ms 34472 KB Output is correct
45 Incorrect 54 ms 36768 KB Output isn't correct
46 Halted 0 ms 0 KB -

Subtask #4
0 / 38.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 672 KB Output is correct
2 Correct 1 ms 724 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 800 KB Output is correct
11 Correct 2 ms 724 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 800 KB Output is correct
16 Correct 1 ms 724 KB Output is correct
17 Correct 1 ms 800 KB Output is correct
18 Correct 1 ms 724 KB Output is correct
19 Correct 1 ms 724 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 724 KB Output is correct
23 Correct 1 ms 664 KB Output is correct
24 Correct 1 ms 664 KB Output is correct
25 Correct 1 ms 724 KB Output is correct
26 Correct 3 ms 1108 KB Output is correct
27 Correct 32 ms 25576 KB Output is correct
28 Correct 33 ms 25596 KB Output is correct
29 Correct 136 ms 29676 KB Output is correct
30 Correct 127 ms 29524 KB Output is correct
31 Correct 123 ms 29516 KB Output is correct
32 Correct 127 ms 29564 KB Output is correct
33 Correct 128 ms 30816 KB Output is correct
34 Correct 120 ms 30796 KB Output is correct
35 Correct 107 ms 30668 KB Output is correct
36 Correct 115 ms 30692 KB Output is correct
37 Correct 117 ms 30884 KB Output is correct
38 Correct 119 ms 32400 KB Output is correct
39 Correct 96 ms 32296 KB Output is correct
40 Correct 110 ms 32428 KB Output is correct
41 Correct 105 ms 32444 KB Output is correct
42 Correct 85 ms 33500 KB Output is correct
43 Correct 93 ms 34420 KB Output is correct
44 Correct 91 ms 34472 KB Output is correct
45 Incorrect 54 ms 36768 KB Output isn't correct
46 Halted 0 ms 0 KB -