oj.uz

Submission #528107

# Submission time Handle Problem Language Result Execution time Memory
528107 2022-02-19T09:34:17 Z koioi.org-koosaga From Hacks to Snitches (BOI21_watchmen) C++17
25 / 100
 6000 ms 304264 KB 
#include <bits/stdc++.h>
#define sz(v) ((int)(v).size())
#define all(v) (v).begin(), (v).end()
using namespace std;
typedef long long lint;
typedef pair<lint, lint> pi;
const int mod = 1e9 + 7;
const int MAXN = 250005;
const int MAXL = 2755;

vector<lint> dist[MAXN];
vector<int> gph[MAXN];
vector<int> ngph[MAXL];
lint eist[MAXL][MAXL];

struct node{
	int x, y; lint dist;
	bool mode;
	bool operator<(const node &n)const{
		return dist > n.dist;
	}
};

void solve(int n, vector<pi> edg, vector<int> vect, int s, int e){
	memset(eist, 0x3f, sizeof(eist));
	int p = 0;
	vector<pi> cycs;
	for(int i = 0; i < sz(vect); i++){
		for(int j = 0; j < vect[i]; j++){
			dist[p].resize(vect[i], 1e18);
			p++;
			cycs.emplace_back(i, j);
		}
	}
	while(p < n){
		dist[p++].resize(1, 1e18);
		cycs.emplace_back(-1, 0);
	}
	for(auto &[u, v] : edg){
		if(cycs[u].first >= 0 && cycs[v].first >= 0){
			ngph[u].push_back(v);
			ngph[v].push_back(u);
		}
		else{
			gph[u].push_back(v);
			gph[v].push_back(u);
		}
	}
	for(int i = 0; i < n; i++){
		sort(all(gph[i]));
		sort(all(ngph[i]));
	}
	priority_queue<node> pq;
	auto enq = [&](int v, lint d){
		if(sz(dist[v]) > 1 && d % sz(dist[v]) == cycs[v].second) return;
		if(dist[v][d % sz(dist[v])] > d){
			dist[v][d % sz(dist[v])] = d;
			pq.push({v, (int)(d % sz(dist[v])), d, 0});
		}
	};
	auto enq2 = [&](int x, int y, lint d){
		if(eist[x][y] > d){
			eist[x][y] = d;
			pq.push({x, y, d, 1});
		}
	};
	memset(eist, 0x3f, sizeof(eist));
	enq(s, 0);
	vector<int> visCount(n);
	while(sz(pq)){
		auto x = pq.top(); pq.pop();
		int v = x.x;
		int w = x.y;
		if(x.mode == 0){
			if(dist[v][w] != x.dist) continue;
			enq(v, x.dist + 1);
			visCount[v]++;
			for(auto &y : gph[v]){
				if(sz(dist[v]) > 1 && visCount[v] > 1 && sz(dist[y]) == 1) break;
				enq(y, x.dist + 1);
				if(sz(dist[v]) == 1 && sz(dist[y]) > 1){
					enq(y, x.dist + 1 + ((cycs[y].second - x.dist) % sz(dist[y]) + sz(dist[y])) % sz(dist[y]));
				}
			}
			if(sz(dist[v]) > 1){
				int sum = 0;
				for(int i = 0; i < sz(vect); i++){
					lint newDist = x.dist;
					enq2(v, sum + newDist % vect[i], newDist);
					sum += vect[i];
				}
			}
		}
		else{
			if(eist[v][w] != x.dist) continue;
			enq2(v, (x.dist + sz(dist[v])) % vect[cycs[v].first], x.dist + sz(dist[v]));
			int s = lower_bound(all(ngph[v]), w - cycs[w].second) - ngph[v].begin();
			for(int i = s; i < sz(ngph[v]); i++){
				int y = ngph[v][i];
				if(cycs[y].first != cycs[w].first) break;
				if(cycs[v].first >= 0 &&
						cycs[v].first == cycs[y].first &&
						x.dist % sz(dist[v]) == cycs[y].second &&
						(x.dist + 1) % sz(dist[v]) == cycs[v].second){
					continue;
				}
				enq(y, x.dist + 1);
			}
		}
	}
	lint ans = *min_element(all(dist[e]));
	if(ans < 1e17) cout << ans << "\n";
	else cout << "impossible\n";
}

int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int n, m; cin >> n >> m;
	vector<pi> edg;
	for(int i = 0; i < m; i++){
		int u, v; cin >> u >> v;
		edg.emplace_back(u-1, v-1);
	}
	vector<int> idx(n, -1);
	int cnt = 0;
	int k; cin >> k;
	vector<int> siz(k);
	for(int i = 0; i < k; i++){
		cin >> siz[i];
		for(int j = 0; j < siz[i]; j++){
			int v; cin >> v;
			idx[v - 1] = cnt++;
		}
	}
	for(int i = 0; i < n; i++){
		if(idx[i] == -1) idx[i] = cnt++;
	}
	for(auto &[u, v] : edg){
		u = idx[u];
		v = idx[v];
	}
	solve(n, edg, siz, idx[0], idx[n - 1]);
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 73 ms 75192 KB Output is correct
2 Correct 115 ms 83420 KB Output is correct
3 Correct 105 ms 82848 KB Output is correct
4 Correct 120 ms 82868 KB Output is correct
5 Correct 37 ms 71664 KB Output is correct
6 Correct 106 ms 82872 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 73 ms 75176 KB Output is correct
2 Correct 118 ms 83588 KB Output is correct
3 Correct 111 ms 82796 KB Output is correct
4 Correct 121 ms 82892 KB Output is correct
5 Correct 37 ms 71652 KB Output is correct
6 Correct 105 ms 82788 KB Output is correct
7 Correct 110 ms 82772 KB Output is correct
8 Correct 107 ms 82800 KB Output is correct
9 Correct 98 ms 82616 KB Output is correct
10 Correct 122 ms 83076 KB Output is correct
11 Correct 101 ms 82832 KB Output is correct
12 Correct 108 ms 82780 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 73 ms 75176 KB Output is correct
2 Correct 118 ms 83588 KB Output is correct
3 Correct 111 ms 82796 KB Output is correct
4 Correct 121 ms 82892 KB Output is correct
5 Correct 37 ms 71652 KB Output is correct
6 Correct 105 ms 82788 KB Output is correct
7 Correct 110 ms 82772 KB Output is correct
8 Correct 107 ms 82800 KB Output is correct
9 Correct 98 ms 82616 KB Output is correct
10 Correct 122 ms 83076 KB Output is correct
11 Correct 101 ms 82832 KB Output is correct
12 Correct 108 ms 82780 KB Output is correct
13 Correct 74 ms 75176 KB Output is correct
14 Correct 116 ms 83352 KB Output is correct
15 Correct 106 ms 82892 KB Output is correct
16 Correct 121 ms 82936 KB Output is correct
17 Correct 36 ms 71644 KB Output is correct
18 Correct 109 ms 82900 KB Output is correct
19 Correct 122 ms 82928 KB Output is correct
20 Correct 104 ms 82720 KB Output is correct
21 Correct 102 ms 82592 KB Output is correct
22 Correct 107 ms 83044 KB Output is correct
23 Correct 103 ms 82748 KB Output is correct
24 Correct 109 ms 82760 KB Output is correct
25 Correct 1526 ms 225432 KB Output is correct
26 Correct 1523 ms 231512 KB Output is correct
27 Correct 1409 ms 223892 KB Output is correct
28 Correct 1279 ms 227968 KB Output is correct
29 Correct 1616 ms 221392 KB Output is correct
30 Correct 1628 ms 223896 KB Output is correct
31 Correct 1616 ms 233552 KB Output is correct

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 73 ms 75176 KB Output is correct
2 Correct 118 ms 83588 KB Output is correct
3 Correct 111 ms 82796 KB Output is correct
4 Correct 121 ms 82892 KB Output is correct
5 Correct 37 ms 71652 KB Output is correct
6 Correct 105 ms 82788 KB Output is correct
7 Correct 110 ms 82772 KB Output is correct
8 Correct 107 ms 82800 KB Output is correct
9 Correct 98 ms 82616 KB Output is correct
10 Correct 122 ms 83076 KB Output is correct
11 Correct 101 ms 82832 KB Output is correct
12 Correct 108 ms 82780 KB Output is correct
13 Correct 74 ms 75176 KB Output is correct
14 Correct 116 ms 83352 KB Output is correct
15 Correct 106 ms 82892 KB Output is correct
16 Correct 121 ms 82936 KB Output is correct
17 Correct 36 ms 71644 KB Output is correct
18 Correct 109 ms 82900 KB Output is correct
19 Correct 122 ms 82928 KB Output is correct
20 Correct 104 ms 82720 KB Output is correct
21 Correct 102 ms 82592 KB Output is correct
22 Correct 107 ms 83044 KB Output is correct
23 Correct 103 ms 82748 KB Output is correct
24 Correct 109 ms 82760 KB Output is correct
25 Correct 1526 ms 225432 KB Output is correct
26 Correct 1523 ms 231512 KB Output is correct
27 Correct 1409 ms 223892 KB Output is correct
28 Correct 1279 ms 227968 KB Output is correct
29 Correct 1616 ms 221392 KB Output is correct
30 Correct 1628 ms 223896 KB Output is correct
31 Correct 1616 ms 233552 KB Output is correct
32 Correct 75 ms 75388 KB Output is correct
33 Correct 113 ms 83508 KB Output is correct
34 Correct 107 ms 83032 KB Output is correct
35 Correct 145 ms 83256 KB Output is correct
36 Correct 40 ms 71560 KB Output is correct
37 Correct 106 ms 83052 KB Output is correct
38 Correct 105 ms 83012 KB Output is correct
39 Correct 108 ms 83000 KB Output is correct
40 Correct 109 ms 82872 KB Output is correct
41 Correct 112 ms 83264 KB Output is correct
42 Correct 106 ms 82996 KB Output is correct
43 Correct 107 ms 83032 KB Output is correct
44 Correct 1548 ms 225740 KB Output is correct
45 Correct 1506 ms 231476 KB Output is correct
46 Correct 1588 ms 224028 KB Output is correct
47 Correct 1290 ms 228024 KB Output is correct
48 Correct 1604 ms 221400 KB Output is correct
49 Correct 1627 ms 224360 KB Output is correct
50 Correct 1594 ms 233468 KB Output is correct
51 Correct 2106 ms 242980 KB Output is correct
52 Correct 3336 ms 304264 KB Output is correct
53 Correct 3112 ms 286756 KB Output is correct
54 Correct 1976 ms 226040 KB Output is correct
55 Execution timed out 6093 ms 255036 KB Time limit exceeded
56 Halted 0 ms 0 KB -

Subtask #5
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 73 ms 75192 KB Output is correct
2 Correct 115 ms 83420 KB Output is correct
3 Correct 105 ms 82848 KB Output is correct
4 Correct 120 ms 82868 KB Output is correct
5 Correct 37 ms 71664 KB Output is correct
6 Correct 106 ms 82872 KB Output is correct
7 Correct 73 ms 75176 KB Output is correct
8 Correct 118 ms 83588 KB Output is correct
9 Correct 111 ms 82796 KB Output is correct
10 Correct 121 ms 82892 KB Output is correct
11 Correct 37 ms 71652 KB Output is correct
12 Correct 105 ms 82788 KB Output is correct
13 Correct 110 ms 82772 KB Output is correct
14 Correct 107 ms 82800 KB Output is correct
15 Correct 98 ms 82616 KB Output is correct
16 Correct 122 ms 83076 KB Output is correct
17 Correct 101 ms 82832 KB Output is correct
18 Correct 108 ms 82780 KB Output is correct
19 Correct 38 ms 71452 KB Output is correct
20 Correct 38 ms 71452 KB Output is correct
21 Correct 40 ms 71500 KB Output is correct
22 Correct 77 ms 75736 KB Output is correct
23 Correct 113 ms 84204 KB Output is correct
24 Correct 108 ms 83680 KB Output is correct
25 Correct 125 ms 83700 KB Output is correct
26 Correct 40 ms 71620 KB Output is correct
27 Correct 109 ms 83636 KB Output is correct
28 Correct 107 ms 83556 KB Output is correct
29 Correct 117 ms 83624 KB Output is correct
30 Correct 104 ms 83380 KB Output is correct
31 Correct 110 ms 83860 KB Output is correct
32 Correct 104 ms 83640 KB Output is correct
33 Correct 114 ms 83652 KB Output is correct
34 Correct 1550 ms 228212 KB Output is correct
35 Correct 1586 ms 225300 KB Output is correct
36 Correct 1595 ms 225076 KB Output is correct
37 Incorrect 1374 ms 229720 KB Output isn't correct
38 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 73 ms 75192 KB Output is correct
2 Correct 115 ms 83420 KB Output is correct
3 Correct 105 ms 82848 KB Output is correct
4 Correct 120 ms 82868 KB Output is correct
5 Correct 37 ms 71664 KB Output is correct
6 Correct 106 ms 82872 KB Output is correct
7 Correct 73 ms 75176 KB Output is correct
8 Correct 118 ms 83588 KB Output is correct
9 Correct 111 ms 82796 KB Output is correct
10 Correct 121 ms 82892 KB Output is correct
11 Correct 37 ms 71652 KB Output is correct
12 Correct 105 ms 82788 KB Output is correct
13 Correct 110 ms 82772 KB Output is correct
14 Correct 107 ms 82800 KB Output is correct
15 Correct 98 ms 82616 KB Output is correct
16 Correct 122 ms 83076 KB Output is correct
17 Correct 101 ms 82832 KB Output is correct
18 Correct 108 ms 82780 KB Output is correct
19 Correct 74 ms 75176 KB Output is correct
20 Correct 116 ms 83352 KB Output is correct
21 Correct 106 ms 82892 KB Output is correct
22 Correct 121 ms 82936 KB Output is correct
23 Correct 36 ms 71644 KB Output is correct
24 Correct 109 ms 82900 KB Output is correct
25 Correct 122 ms 82928 KB Output is correct
26 Correct 104 ms 82720 KB Output is correct
27 Correct 102 ms 82592 KB Output is correct
28 Correct 107 ms 83044 KB Output is correct
29 Correct 103 ms 82748 KB Output is correct
30 Correct 109 ms 82760 KB Output is correct
31 Correct 1526 ms 225432 KB Output is correct
32 Correct 1523 ms 231512 KB Output is correct
33 Correct 1409 ms 223892 KB Output is correct
34 Correct 1279 ms 227968 KB Output is correct
35 Correct 1616 ms 221392 KB Output is correct
36 Correct 1628 ms 223896 KB Output is correct
37 Correct 1616 ms 233552 KB Output is correct
38 Correct 38 ms 71452 KB Output is correct
39 Correct 38 ms 71452 KB Output is correct
40 Correct 40 ms 71500 KB Output is correct
41 Correct 77 ms 75736 KB Output is correct
42 Correct 113 ms 84204 KB Output is correct
43 Correct 108 ms 83680 KB Output is correct
44 Correct 125 ms 83700 KB Output is correct
45 Correct 40 ms 71620 KB Output is correct
46 Correct 109 ms 83636 KB Output is correct
47 Correct 107 ms 83556 KB Output is correct
48 Correct 117 ms 83624 KB Output is correct
49 Correct 104 ms 83380 KB Output is correct
50 Correct 110 ms 83860 KB Output is correct
51 Correct 104 ms 83640 KB Output is correct
52 Correct 114 ms 83652 KB Output is correct
53 Correct 1550 ms 228212 KB Output is correct
54 Correct 1586 ms 225300 KB Output is correct
55 Correct 1595 ms 225076 KB Output is correct
56 Incorrect 1374 ms 229720 KB Output isn't correct
57 Halted 0 ms 0 KB -

Subtask #7
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 73 ms 75192 KB Output is correct
2 Correct 115 ms 83420 KB Output is correct
3 Correct 105 ms 82848 KB Output is correct
4 Correct 120 ms 82868 KB Output is correct
5 Correct 37 ms 71664 KB Output is correct
6 Correct 106 ms 82872 KB Output is correct
7 Correct 73 ms 75176 KB Output is correct
8 Correct 118 ms 83588 KB Output is correct
9 Correct 111 ms 82796 KB Output is correct
10 Correct 121 ms 82892 KB Output is correct
11 Correct 37 ms 71652 KB Output is correct
12 Correct 105 ms 82788 KB Output is correct
13 Correct 110 ms 82772 KB Output is correct
14 Correct 107 ms 82800 KB Output is correct
15 Correct 98 ms 82616 KB Output is correct
16 Correct 122 ms 83076 KB Output is correct
17 Correct 101 ms 82832 KB Output is correct
18 Correct 108 ms 82780 KB Output is correct
19 Correct 74 ms 75176 KB Output is correct
20 Correct 116 ms 83352 KB Output is correct
21 Correct 106 ms 82892 KB Output is correct
22 Correct 121 ms 82936 KB Output is correct
23 Correct 36 ms 71644 KB Output is correct
24 Correct 109 ms 82900 KB Output is correct
25 Correct 122 ms 82928 KB Output is correct
26 Correct 104 ms 82720 KB Output is correct
27 Correct 102 ms 82592 KB Output is correct
28 Correct 107 ms 83044 KB Output is correct
29 Correct 103 ms 82748 KB Output is correct
30 Correct 109 ms 82760 KB Output is correct
31 Correct 1526 ms 225432 KB Output is correct
32 Correct 1523 ms 231512 KB Output is correct
33 Correct 1409 ms 223892 KB Output is correct
34 Correct 1279 ms 227968 KB Output is correct
35 Correct 1616 ms 221392 KB Output is correct
36 Correct 1628 ms 223896 KB Output is correct
37 Correct 1616 ms 233552 KB Output is correct
38 Correct 75 ms 75388 KB Output is correct
39 Correct 113 ms 83508 KB Output is correct
40 Correct 107 ms 83032 KB Output is correct
41 Correct 145 ms 83256 KB Output is correct
42 Correct 40 ms 71560 KB Output is correct
43 Correct 106 ms 83052 KB Output is correct
44 Correct 105 ms 83012 KB Output is correct
45 Correct 108 ms 83000 KB Output is correct
46 Correct 109 ms 82872 KB Output is correct
47 Correct 112 ms 83264 KB Output is correct
48 Correct 106 ms 82996 KB Output is correct
49 Correct 107 ms 83032 KB Output is correct
50 Correct 1548 ms 225740 KB Output is correct
51 Correct 1506 ms 231476 KB Output is correct
52 Correct 1588 ms 224028 KB Output is correct
53 Correct 1290 ms 228024 KB Output is correct
54 Correct 1604 ms 221400 KB Output is correct
55 Correct 1627 ms 224360 KB Output is correct
56 Correct 1594 ms 233468 KB Output is correct
57 Correct 2106 ms 242980 KB Output is correct
58 Correct 3336 ms 304264 KB Output is correct
59 Correct 3112 ms 286756 KB Output is correct
60 Correct 1976 ms 226040 KB Output is correct
61 Execution timed out 6093 ms 255036 KB Time limit exceeded
62 Halted 0 ms 0 KB -