oj.uz

답안 #269825

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
269825 2020-08-17T10:35:37 Z shivensinha4 경주 (Race) (IOI11_race) C++17
21 / 100
 2290 ms 164532 KB 
#include <bits/stdc++.h> 
#include "race.h"
using namespace std; 
#define for_(i, s, e) for (int i = s; i < e; i++)
#define for__(i, s, e) for (ll i = s; i < e; i++)
#define SSTR(x) static_cast<std::ostringstream&>((std::ostringstream() << std::dec << x)).str()
typedef long long ll;
typedef vector<int> vi;
typedef pair<int, int> ii;
//#define endl '\n'

int n, k, l, timer = 0;
vector<vector<pair<int, ll>>> adjList;
vi removed, subtreeSize, centroid, tin, tout;
vector<unordered_map<ll, vector<ii>>> paths; // {length, {child, roads}}
vector<vi> up; vector<vector<ll>> upDist;
vector<ll> depth, edges;
int ans = 1e9;

int dfs(int p, int parent, ll d) {
	int s = 1;
	tin[p] = ++timer;
	depth[p] = d;
	edges[p] = edges[parent] + 1;
	
	for_(i, 1, l+1) up[p][i] = up[up[p][i-1]][i-1];
		
	for (auto i: adjList[p]) if (i.first != parent) {
		up[i.first][0] = p;
		s += dfs(i.first, p, d+i.second);
	}
	
	subtreeSize[p] = s;
	tout[p] = ++timer;
	return s;
}

bool is_ancestor(int u, int v) {
	return tin[u] <= tin[v] && tout[u] >= tout[v];
}


int lca(int u, int v) {
	if (is_ancestor(u, v)) return u;
	if (is_ancestor(v, u)) return v;
	for (int i = l; i >= 0; --i) if (!is_ancestor(up[u][i], v)) u = up[u][i];
	
	return up[u][0];
}

// {distance, edges}
//pair<ll, int> ancDist(int u, int anc) {
	//if (u == anc) return {0, 0};
	
	//ll dist = 0, edges = 0;
	//for (int i = l; i >= 0; --i) if (!is_ancestor(up[u][i], anc)) {
		//dist += upDist[u][i];
		//edges += (1 << i);
		//u = up[u][i];
	//}
	
	//return {dist + upDist[u][0], edges+1};
//}

pair<ll, int> dist(int u, int v) {
	int lc = lca(u, v);
	return {depth[u] + depth[v] - 2*depth[lc], edges[u] + edges[v] - 2*edges[lc]};
}

void decompose(int p, int c) {
	int invalidChild = -1, sizeLimit = (subtreeSize[p] >> 1);
	for (auto i: adjList[p]) if (!removed[i.first] and subtreeSize[i.first] > sizeLimit) {
		invalidChild = i.first;
		break;
	}
	
	if (invalidChild != -1) {
		subtreeSize[p] -= subtreeSize[invalidChild];
		subtreeSize[invalidChild] += subtreeSize[p];
		return decompose(invalidChild, c);
	}
	
	removed[p] = true;
	centroid[p] = c;
	for (auto i: adjList[p]) if (!removed[i.first]) {
		centroid[i.first] = p;
		decompose(i.first, p);
	}
}

void updateParents(int p) {
	int a = p, b = centroid[p];
	while (b != -1) {
		ii d = dist(p, b);
		paths[b][d.first].push_back({d.second, a});
		a = b; b = centroid[b];
	}
}

void solve(int p) {
	int a = p, b = centroid[p];
	while (b != -1) {
		ii d = dist(p, b);
		for (auto o: paths[b][k-d.first]) if (o.second != a) {
			ans = min(ans, o.first + d.second);
			break;
		}
		a = b; b = centroid[b];
	}
}

int best_path(int N, int K, int H[][2], int L[]) {
	n = N, k = K;
	adjList.resize(n); subtreeSize.resize(n); removed.resize(n); paths.resize(n); centroid.resize(n, -1); tin.resize(n); tout.resize(n); up.resize(n); depth.resize(n); edges.resize(n);
	l = ceil(log2(n));
	up.assign(n, vi(l+1)); upDist.assign(n, vector<ll>(l+1));
	for_(i, 0, n-1) {
		int a, b; ll w; a = H[i][0], b = H[i][1]; w = L[i];
		adjList[a].push_back({b, w});
		adjList[b].push_back({a, w});
	}
	
	dfs(0, 0, 0);
	decompose(0, -1);
	
	for_(i, 0, n) updateParents(i);
	
	for_(i, 0, n) {
		paths[i][0].push_back({0, -1});
		for (auto o: paths[i]) if (o.second.size() > 1) {
			sort(paths[i][o.first].begin(), paths[i][o.first].begin()+2);
		}
	}
	
	for_(i, 0, n) solve(i);
	
	return (ans == 1e9 ? -1 : ans);
}

//int main() {
	//#ifndef ONLINE_JUDGE
	//freopen("test.in", "r", stdin);
	//#endif
	
	//ios_base::sync_with_stdio(false);
	//cin.tie(0);
	
	//int H[100000][2], L[100000];
	//int N, K;
	//cin >> N >> K;
	//for_(i, 0, N-1) {
		//int a, b; ll w; cin >> a >> b >> w;
		//H[i][0] = a; H[i][1] = b;
		//L[i] = w;
	//}
	
	//cout << best_path(N, K, H, L) << endl;

	//return 0;
//}

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 1 ms 384 KB Output is correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 1 ms 384 KB Output is correct
11 Correct 1 ms 384 KB Output is correct
12 Correct 1 ms 384 KB Output is correct
13 Correct 1 ms 384 KB Output is correct
14 Correct 1 ms 384 KB Output is correct
15 Correct 1 ms 384 KB Output is correct
16 Correct 1 ms 384 KB Output is correct
17 Correct 1 ms 384 KB Output is correct
18 Correct 1 ms 384 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 1 ms 384 KB Output is correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 1 ms 384 KB Output is correct
11 Correct 1 ms 384 KB Output is correct
12 Correct 1 ms 384 KB Output is correct
13 Correct 1 ms 384 KB Output is correct
14 Correct 1 ms 384 KB Output is correct
15 Correct 1 ms 384 KB Output is correct
16 Correct 1 ms 384 KB Output is correct
17 Correct 1 ms 384 KB Output is correct
18 Correct 1 ms 384 KB Output is correct
19 Correct 1 ms 384 KB Output is correct
20 Correct 1 ms 384 KB Output is correct
21 Correct 4 ms 1280 KB Output is correct
22 Correct 5 ms 1664 KB Output is correct
23 Correct 5 ms 1664 KB Output is correct
24 Correct 5 ms 1536 KB Output is correct
25 Correct 5 ms 1536 KB Output is correct
26 Correct 4 ms 1408 KB Output is correct
27 Correct 4 ms 1024 KB Output is correct
28 Correct 5 ms 1536 KB Output is correct
29 Correct 4 ms 1536 KB Output is correct
30 Correct 5 ms 1536 KB Output is correct
31 Correct 6 ms 1536 KB Output is correct
32 Correct 5 ms 1536 KB Output is correct
33 Correct 5 ms 1764 KB Output is correct
34 Correct 6 ms 1792 KB Output is correct
35 Correct 5 ms 1664 KB Output is correct
36 Correct 5 ms 1664 KB Output is correct
37 Correct 7 ms 1536 KB Output is correct
38 Correct 7 ms 1664 KB Output is correct

Subtask #3
0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 1 ms 384 KB Output is correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 1 ms 384 KB Output is correct
11 Correct 1 ms 384 KB Output is correct
12 Correct 1 ms 384 KB Output is correct
13 Correct 1 ms 384 KB Output is correct
14 Correct 1 ms 384 KB Output is correct
15 Correct 1 ms 384 KB Output is correct
16 Correct 1 ms 384 KB Output is correct
17 Correct 1 ms 384 KB Output is correct
18 Correct 1 ms 384 KB Output is correct
19 Correct 1264 ms 103120 KB Output is correct
20 Correct 1292 ms 102904 KB Output is correct
21 Correct 1129 ms 100976 KB Output is correct
22 Correct 1073 ms 96632 KB Output is correct
23 Correct 2290 ms 164532 KB Output is correct
24 Correct 804 ms 91512 KB Output is correct
25 Incorrect 1533 ms 91936 KB Output isn't correct
26 Halted 0 ms 0 KB -

Subtask #4
0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 1 ms 384 KB Output is correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 1 ms 384 KB Output is correct
11 Correct 1 ms 384 KB Output is correct
12 Correct 1 ms 384 KB Output is correct
13 Correct 1 ms 384 KB Output is correct
14 Correct 1 ms 384 KB Output is correct
15 Correct 1 ms 384 KB Output is correct
16 Correct 1 ms 384 KB Output is correct
17 Correct 1 ms 384 KB Output is correct
18 Correct 1 ms 384 KB Output is correct
19 Correct 1 ms 384 KB Output is correct
20 Correct 1 ms 384 KB Output is correct
21 Correct 4 ms 1280 KB Output is correct
22 Correct 5 ms 1664 KB Output is correct
23 Correct 5 ms 1664 KB Output is correct
24 Correct 5 ms 1536 KB Output is correct
25 Correct 5 ms 1536 KB Output is correct
26 Correct 4 ms 1408 KB Output is correct
27 Correct 4 ms 1024 KB Output is correct
28 Correct 5 ms 1536 KB Output is correct
29 Correct 4 ms 1536 KB Output is correct
30 Correct 5 ms 1536 KB Output is correct
31 Correct 6 ms 1536 KB Output is correct
32 Correct 5 ms 1536 KB Output is correct
33 Correct 5 ms 1764 KB Output is correct
34 Correct 6 ms 1792 KB Output is correct
35 Correct 5 ms 1664 KB Output is correct
36 Correct 5 ms 1664 KB Output is correct
37 Correct 7 ms 1536 KB Output is correct
38 Correct 7 ms 1664 KB Output is correct
39 Correct 1264 ms 103120 KB Output is correct
40 Correct 1292 ms 102904 KB Output is correct
41 Correct 1129 ms 100976 KB Output is correct
42 Correct 1073 ms 96632 KB Output is correct
43 Correct 2290 ms 164532 KB Output is correct
44 Correct 804 ms 91512 KB Output is correct
45 Incorrect 1533 ms 91936 KB Output isn't correct
46 Halted 0 ms 0 KB -