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Submission #263364

# Submission time Handle Problem Language Result Execution time Memory
263364 2020-08-13T16:08:24 Z maximath_1 Race (IOI11_race) C++11
100 / 100
 697 ms 34296 KB 
#include "race.h"
#include <vector>
#include <bitset>
using namespace std;

vector<pair<int, int> > adj[200005];
int dp[1000005], path[1000005], sz[200005];
int n, k, ans = -1, centroid, mxnode, cnt = 0;
bitset<200005> vis;

int dfs_subtree(int nw, int bf){
	sz[nw] = 1;
	for(pair<int, int> nx : adj[nw])
		if(!vis[nx.first] && nx.first != bf)
			sz[nw] += dfs_subtree(nx.first, nw);
	return sz[nw];
}

void centroid_decomp(int nw, int bf, int all){
	int rs = all - sz[nw];
	for(pair<int, int> nx : adj[nw]) 
		if(!vis[nx.first] && nx.first != bf){
			centroid_decomp(nx.first, nw, all);
			rs = max(rs, sz[nx.first]);
		}
	if(rs < mxnode){
		centroid = nw;
		mxnode = rs;
	}
}

void dfs(int nw, int bf, int cst, int edge, bool fill){
	if(cst > k) return;
	if(!fill){
		if(dp[k - cst] == cnt && (edge + path[k - cst] < ans || ans == -1))
			ans = edge + path[k - cst];
		if(cst == k && (edge < ans || ans == -1))
			ans = edge;
	}else if(dp[cst] < cnt  || edge < path[cst]){
		dp[cst] = cnt;
		path[cst] = edge;
	}

	for(pair<int, int> nx : adj[nw]) if(!vis[nx.first] && nx.first != bf)
		dfs(nx.first, nw, cst + nx.second, edge + 1, fill);
}

void solve(int nw){
	cnt ++;
	if(dfs_subtree(nw, -1) <= 1) return;
	mxnode = sz[nw] + 1;
	centroid_decomp(nw, -1, sz[nw]);
	for(pair<int, int> nx : adj[centroid]) if(!vis[nx.first]){
		dfs(nx.first, centroid, nx.second, 1, false);
		dfs(nx.first, centroid, nx.second, 1, true);
	}
	vis[centroid] = 1;
	for(pair<int, int> nx : adj[centroid]) if(!vis[nx.first])
		solve(nx.first);
}

int best_path(int N, int K, int H[][2], int L[]){
	n = N; k = K;
	for(int i = 1; i < n; i ++){
		adj[H[i - 1][0]].push_back({H[i - 1][1], L[i - 1]});
		adj[H[i - 1][1]].push_back({H[i - 1][0], L[i - 1]});
	}

	solve(0);
	return ans;
}

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 5056 KB Output is correct
2 Correct 3 ms 4992 KB Output is correct
3 Correct 3 ms 4992 KB Output is correct
4 Correct 4 ms 4992 KB Output is correct
5 Correct 3 ms 4992 KB Output is correct
6 Correct 3 ms 4992 KB Output is correct
7 Correct 3 ms 4992 KB Output is correct
8 Correct 4 ms 4992 KB Output is correct
9 Correct 3 ms 4992 KB Output is correct
10 Correct 5 ms 5096 KB Output is correct
11 Correct 4 ms 4992 KB Output is correct
12 Correct 5 ms 4992 KB Output is correct
13 Correct 3 ms 4992 KB Output is correct
14 Correct 4 ms 5120 KB Output is correct
15 Correct 3 ms 4992 KB Output is correct
16 Correct 5 ms 5096 KB Output is correct
17 Correct 4 ms 5056 KB Output is correct
18 Correct 3 ms 4992 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 5056 KB Output is correct
2 Correct 3 ms 4992 KB Output is correct
3 Correct 3 ms 4992 KB Output is correct
4 Correct 4 ms 4992 KB Output is correct
5 Correct 3 ms 4992 KB Output is correct
6 Correct 3 ms 4992 KB Output is correct
7 Correct 3 ms 4992 KB Output is correct
8 Correct 4 ms 4992 KB Output is correct
9 Correct 3 ms 4992 KB Output is correct
10 Correct 5 ms 5096 KB Output is correct
11 Correct 4 ms 4992 KB Output is correct
12 Correct 5 ms 4992 KB Output is correct
13 Correct 3 ms 4992 KB Output is correct
14 Correct 4 ms 5120 KB Output is correct
15 Correct 3 ms 4992 KB Output is correct
16 Correct 5 ms 5096 KB Output is correct
17 Correct 4 ms 5056 KB Output is correct
18 Correct 3 ms 4992 KB Output is correct
19 Correct 3 ms 4992 KB Output is correct
20 Correct 4 ms 4992 KB Output is correct
21 Correct 5 ms 5120 KB Output is correct
22 Correct 9 ms 10112 KB Output is correct
23 Correct 7 ms 9344 KB Output is correct
24 Correct 9 ms 10856 KB Output is correct
25 Correct 7 ms 8648 KB Output is correct
26 Correct 6 ms 7680 KB Output is correct
27 Correct 4 ms 5120 KB Output is correct
28 Correct 6 ms 6656 KB Output is correct
29 Correct 7 ms 7680 KB Output is correct
30 Correct 6 ms 7936 KB Output is correct
31 Correct 8 ms 8704 KB Output is correct
32 Correct 8 ms 8832 KB Output is correct
33 Correct 10 ms 10368 KB Output is correct
34 Correct 9 ms 9600 KB Output is correct
35 Correct 8 ms 11008 KB Output is correct
36 Correct 9 ms 11520 KB Output is correct
37 Correct 7 ms 8960 KB Output is correct
38 Correct 6 ms 7424 KB Output is correct

Subtask #3
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 5056 KB Output is correct
2 Correct 3 ms 4992 KB Output is correct
3 Correct 3 ms 4992 KB Output is correct
4 Correct 4 ms 4992 KB Output is correct
5 Correct 3 ms 4992 KB Output is correct
6 Correct 3 ms 4992 KB Output is correct
7 Correct 3 ms 4992 KB Output is correct
8 Correct 4 ms 4992 KB Output is correct
9 Correct 3 ms 4992 KB Output is correct
10 Correct 5 ms 5096 KB Output is correct
11 Correct 4 ms 4992 KB Output is correct
12 Correct 5 ms 4992 KB Output is correct
13 Correct 3 ms 4992 KB Output is correct
14 Correct 4 ms 5120 KB Output is correct
15 Correct 3 ms 4992 KB Output is correct
16 Correct 5 ms 5096 KB Output is correct
17 Correct 4 ms 5056 KB Output is correct
18 Correct 3 ms 4992 KB Output is correct
19 Correct 289 ms 10616 KB Output is correct
20 Correct 263 ms 10616 KB Output is correct
21 Correct 182 ms 10616 KB Output is correct
22 Correct 195 ms 10744 KB Output is correct
23 Correct 110 ms 10744 KB Output is correct
24 Correct 75 ms 10616 KB Output is correct
25 Correct 150 ms 14072 KB Output is correct
26 Correct 114 ms 17932 KB Output is correct
27 Correct 224 ms 15916 KB Output is correct
28 Correct 371 ms 30328 KB Output is correct
29 Correct 412 ms 29176 KB Output is correct
30 Correct 255 ms 16120 KB Output is correct
31 Correct 251 ms 16248 KB Output is correct
32 Correct 287 ms 15992 KB Output is correct
33 Correct 312 ms 14968 KB Output is correct
34 Correct 272 ms 14840 KB Output is correct

Subtask #4
57.0 / 57.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 5056 KB Output is correct
2 Correct 3 ms 4992 KB Output is correct
3 Correct 3 ms 4992 KB Output is correct
4 Correct 4 ms 4992 KB Output is correct
5 Correct 3 ms 4992 KB Output is correct
6 Correct 3 ms 4992 KB Output is correct
7 Correct 3 ms 4992 KB Output is correct
8 Correct 4 ms 4992 KB Output is correct
9 Correct 3 ms 4992 KB Output is correct
10 Correct 5 ms 5096 KB Output is correct
11 Correct 4 ms 4992 KB Output is correct
12 Correct 5 ms 4992 KB Output is correct
13 Correct 3 ms 4992 KB Output is correct
14 Correct 4 ms 5120 KB Output is correct
15 Correct 3 ms 4992 KB Output is correct
16 Correct 5 ms 5096 KB Output is correct
17 Correct 4 ms 5056 KB Output is correct
18 Correct 3 ms 4992 KB Output is correct
19 Correct 3 ms 4992 KB Output is correct
20 Correct 4 ms 4992 KB Output is correct
21 Correct 5 ms 5120 KB Output is correct
22 Correct 9 ms 10112 KB Output is correct
23 Correct 7 ms 9344 KB Output is correct
24 Correct 9 ms 10856 KB Output is correct
25 Correct 7 ms 8648 KB Output is correct
26 Correct 6 ms 7680 KB Output is correct
27 Correct 4 ms 5120 KB Output is correct
28 Correct 6 ms 6656 KB Output is correct
29 Correct 7 ms 7680 KB Output is correct
30 Correct 6 ms 7936 KB Output is correct
31 Correct 8 ms 8704 KB Output is correct
32 Correct 8 ms 8832 KB Output is correct
33 Correct 10 ms 10368 KB Output is correct
34 Correct 9 ms 9600 KB Output is correct
35 Correct 8 ms 11008 KB Output is correct
36 Correct 9 ms 11520 KB Output is correct
37 Correct 7 ms 8960 KB Output is correct
38 Correct 6 ms 7424 KB Output is correct
39 Correct 289 ms 10616 KB Output is correct
40 Correct 263 ms 10616 KB Output is correct
41 Correct 182 ms 10616 KB Output is correct
42 Correct 195 ms 10744 KB Output is correct
43 Correct 110 ms 10744 KB Output is correct
44 Correct 75 ms 10616 KB Output is correct
45 Correct 150 ms 14072 KB Output is correct
46 Correct 114 ms 17932 KB Output is correct
47 Correct 224 ms 15916 KB Output is correct
48 Correct 371 ms 30328 KB Output is correct
49 Correct 412 ms 29176 KB Output is correct
50 Correct 255 ms 16120 KB Output is correct
51 Correct 251 ms 16248 KB Output is correct
52 Correct 287 ms 15992 KB Output is correct
53 Correct 312 ms 14968 KB Output is correct
54 Correct 272 ms 14840 KB Output is correct
55 Correct 14 ms 5760 KB Output is correct
56 Correct 15 ms 5760 KB Output is correct
57 Correct 101 ms 10836 KB Output is correct
58 Correct 43 ms 10740 KB Output is correct
59 Correct 145 ms 18552 KB Output is correct
60 Correct 582 ms 34296 KB Output is correct
61 Correct 233 ms 15992 KB Output is correct
62 Correct 252 ms 15992 KB Output is correct
63 Correct 389 ms 16076 KB Output is correct
64 Correct 697 ms 18000 KB Output is correct
65 Correct 373 ms 15980 KB Output is correct
66 Correct 595 ms 34296 KB Output is correct
67 Correct 138 ms 16268 KB Output is correct
68 Correct 393 ms 21496 KB Output is correct
69 Correct 428 ms 21752 KB Output is correct
70 Correct 345 ms 20856 KB Output is correct