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답안 #926013

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
926013 2024-02-12T12:51:12 Z SNP011 Dynamic Diameter (CEOI19_diameter) C++17
24 / 100
 183 ms 108344 KB 
#include <bits/stdc++.h>

using namespace std;

#define pb push_back
#define pii pair<long long, long long>
#define int long long
const int maxn = 2e5 + 5, inf = 1e18;

int lastans;
int n, q, w;
vector<pii> adj[maxn], edge;
map<pii, int> va;
vector<int> dis;
bool vis[maxn];
int dp[4 * maxn][5], st[maxn], fn[maxn];
int h[maxn], lazy[maxn];

void dfs(int v) {
	vis[v] = 1;
	st[v] = dis.size();
	dis.pb(h[v]);
	for (auto[w, u]: adj[v]) {
		if (!vis[u]) {
			h[u] = h[v] + w;
			dfs(u);
			dis.pb(h[v]);
		}
	}
	fn[v] = dis.size() - 1;
}

void updateDP(int id) {
	int lc = 2 * id, rc = 2 * id + 1;
	dp[id][0] = max({dp[lc][0], dp[rc][0], dp[lc][2] + dp[rc][4], dp[lc][3] + dp[rc][2]});
	dp[id][1] = min(dp[lc][1], dp[rc][1]);
	dp[id][2] = max(dp[lc][2], dp[rc][2]);
	dp[id][3] = max({dp[lc][3], dp[rc][3], dp[lc][2] - (2 * dp[rc][1])});
	dp[id][4] = max({dp[lc][4], dp[rc][4], dp[rc][2] - (2 * dp[lc][1])});
}

void printDP(int id, int L, int R) {
	cout << L << ", " << R - 1 << ": \n";
	cout << "dp[0] = " << dp[id][0] << '\n';
	cout << "dp[1] = " << dp[id][1] << '\n';
	cout << "dp[2] = " << dp[id][2] << '\n';
	cout << "dp[3] = " << dp[id][3] << '\n';
	cout << "dp[4] = " << dp[id][4] << '\n';
	cout << "\n\n-----------------\n\n";
}

struct segment {
	void spread(int id) {
		dp[2 * id][1] += lazy[id];
		dp[2 * id][2] += lazy[id];
		dp[2 * id][3] -= lazy[id];
		dp[2 * id][4] -= lazy[id];

		dp[2 * id + 1][1] += lazy[id];
		dp[2 * id + 1][2] += lazy[id];
		dp[2 * id + 1][3] -= lazy[id];
		dp[2 * id + 1][4] -= lazy[id];

		lazy[2 * id] += lazy[id];
		lazy[2 * id + 1] += lazy[id];
		lazy[id] = 0;
	}

	void init(int id, int L, int R) {
		if (L + 1 == R) {
			dp[id][1] = dis[L];
			dp[id][2] = dis[L];
			// printDP(id, L, R);
			return;
		}
		int mid = (R + L) >> 1;
		init(2 * id, L, mid);
		init(2 * id + 1, mid, R);
		updateDP(id);
		// printDP(id, L, R);
	}

	void update(int id, int L, int R, int l, int r, int val) {
		if (L == l and R == r) {
			dp[id][1] += val;
			dp[id][2] += val;
			dp[id][3] -= val;
			dp[id][4] -= val;
			lazy[id] += val;
			return;
		}
		spread(id);
		int mid = (R + L) >> 1;
		if (l < mid) {
			update(2 * id, L, mid, l, min(r, mid), val);
		}
		if (r > mid) {
			update(2 * id + 1, mid, R, max(l, mid), r, val);
		}
		updateDP(id);
		// printDP(id, L, R);
	}
} seg;

signed main() {
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);

	for (int i = 0; i < maxn; i++) {
		for (int j = 0; j < 5; j++) {
			dp[i][j] = (j == 1 ? inf : 0 - inf);
		}
	}

	cin >> n >> q >> w;
	for (int i = 1; i < n; i++) {
		int u, v, _w;
		cin >> u >> v >> _w;
		adj[v].pb({_w, u});
		adj[u].pb({_w, v});
		va[{u, v}] = _w;
		va[{v, u}] = _w;
		edge.pb({u, v});
	}
	dis.pb(-1);
	dfs(1);
	seg.init(1, 1, 2 * n);
	while (q--) {
		int i, x;
		cin >> i >> x;
		i = (i + lastans) % (n - 1);
		x = (x + lastans) % w;
		int u = edge[i].first, v = edge[i].second;

		if (h[u] < h[v]) {
			swap(u, v);
		} // h[u] > h[v]
		seg.update(1, 1, 2 * n, st[u], fn[u] + 1, x - va[{u, v}]);
		cout << max(dp[1][0], dp[1][3]) << '\n';
		lastans = max(dp[1][0], dp[1][3]);
		va[{u, v}] = x;
		va[{v, u}] = x;
	}
	return 0;
}

Subtask #1
11.0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 18008 KB Output is correct
2 Correct 4 ms 18012 KB Output is correct
3 Correct 4 ms 18012 KB Output is correct
4 Correct 4 ms 18012 KB Output is correct
5 Correct 3 ms 18012 KB Output is correct
6 Correct 4 ms 18012 KB Output is correct
7 Correct 4 ms 18012 KB Output is correct
8 Correct 4 ms 18012 KB Output is correct
9 Correct 3 ms 18012 KB Output is correct
10 Correct 4 ms 18012 KB Output is correct
11 Correct 4 ms 18012 KB Output is correct
12 Correct 4 ms 18012 KB Output is correct
13 Correct 3 ms 18012 KB Output is correct
14 Correct 3 ms 18012 KB Output is correct
15 Correct 3 ms 18012 KB Output is correct
16 Correct 3 ms 18012 KB Output is correct
17 Correct 4 ms 18012 KB Output is correct
18 Correct 3 ms 18012 KB Output is correct

Subtask #2
13.0 / 13.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 18008 KB Output is correct
2 Correct 4 ms 18012 KB Output is correct
3 Correct 4 ms 18012 KB Output is correct
4 Correct 4 ms 18012 KB Output is correct
5 Correct 3 ms 18012 KB Output is correct
6 Correct 4 ms 18012 KB Output is correct
7 Correct 4 ms 18012 KB Output is correct
8 Correct 4 ms 18012 KB Output is correct
9 Correct 3 ms 18012 KB Output is correct
10 Correct 4 ms 18012 KB Output is correct
11 Correct 4 ms 18012 KB Output is correct
12 Correct 4 ms 18012 KB Output is correct
13 Correct 3 ms 18012 KB Output is correct
14 Correct 3 ms 18012 KB Output is correct
15 Correct 3 ms 18012 KB Output is correct
16 Correct 3 ms 18012 KB Output is correct
17 Correct 4 ms 18012 KB Output is correct
18 Correct 3 ms 18012 KB Output is correct
19 Correct 7 ms 18268 KB Output is correct
20 Correct 7 ms 18436 KB Output is correct
21 Correct 7 ms 18416 KB Output is correct
22 Correct 8 ms 18472 KB Output is correct
23 Correct 14 ms 19628 KB Output is correct
24 Correct 12 ms 19548 KB Output is correct
25 Correct 12 ms 19548 KB Output is correct
26 Correct 13 ms 19968 KB Output is correct

Subtask #3
0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 18012 KB Output is correct
2 Correct 3 ms 18116 KB Output is correct
3 Correct 5 ms 18008 KB Output is correct
4 Correct 9 ms 18012 KB Output is correct
5 Correct 33 ms 18612 KB Output is correct
6 Correct 3 ms 18012 KB Output is correct
7 Correct 4 ms 18268 KB Output is correct
8 Correct 4 ms 18264 KB Output is correct
9 Correct 5 ms 18268 KB Output is correct
10 Correct 13 ms 18268 KB Output is correct
11 Correct 46 ms 18512 KB Output is correct
12 Correct 7 ms 19292 KB Output is correct
13 Correct 7 ms 19352 KB Output is correct
14 Correct 8 ms 19388 KB Output is correct
15 Correct 19 ms 19624 KB Output is correct
16 Correct 68 ms 20052 KB Output is correct
17 Incorrect 88 ms 51832 KB Output isn't correct
18 Halted 0 ms 0 KB -

Subtask #4
0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 18264 KB Output is correct
2 Correct 10 ms 18272 KB Output is correct
3 Correct 31 ms 18524 KB Output is correct
4 Correct 56 ms 18768 KB Output is correct
5 Correct 10 ms 20828 KB Output is correct
6 Correct 24 ms 20828 KB Output is correct
7 Correct 53 ms 21228 KB Output is correct
8 Correct 83 ms 21324 KB Output is correct
9 Incorrect 38 ms 32596 KB Output isn't correct
10 Halted 0 ms 0 KB -

Subtask #5
0 / 24.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 183 ms 108344 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #6
0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 18008 KB Output is correct
2 Correct 4 ms 18012 KB Output is correct
3 Correct 4 ms 18012 KB Output is correct
4 Correct 4 ms 18012 KB Output is correct
5 Correct 3 ms 18012 KB Output is correct
6 Correct 4 ms 18012 KB Output is correct
7 Correct 4 ms 18012 KB Output is correct
8 Correct 4 ms 18012 KB Output is correct
9 Correct 3 ms 18012 KB Output is correct
10 Correct 4 ms 18012 KB Output is correct
11 Correct 4 ms 18012 KB Output is correct
12 Correct 4 ms 18012 KB Output is correct
13 Correct 3 ms 18012 KB Output is correct
14 Correct 3 ms 18012 KB Output is correct
15 Correct 3 ms 18012 KB Output is correct
16 Correct 3 ms 18012 KB Output is correct
17 Correct 4 ms 18012 KB Output is correct
18 Correct 3 ms 18012 KB Output is correct
19 Correct 7 ms 18268 KB Output is correct
20 Correct 7 ms 18436 KB Output is correct
21 Correct 7 ms 18416 KB Output is correct
22 Correct 8 ms 18472 KB Output is correct
23 Correct 14 ms 19628 KB Output is correct
24 Correct 12 ms 19548 KB Output is correct
25 Correct 12 ms 19548 KB Output is correct
26 Correct 13 ms 19968 KB Output is correct
27 Correct 4 ms 18012 KB Output is correct
28 Correct 3 ms 18116 KB Output is correct
29 Correct 5 ms 18008 KB Output is correct
30 Correct 9 ms 18012 KB Output is correct
31 Correct 33 ms 18612 KB Output is correct
32 Correct 3 ms 18012 KB Output is correct
33 Correct 4 ms 18268 KB Output is correct
34 Correct 4 ms 18264 KB Output is correct
35 Correct 5 ms 18268 KB Output is correct
36 Correct 13 ms 18268 KB Output is correct
37 Correct 46 ms 18512 KB Output is correct
38 Correct 7 ms 19292 KB Output is correct
39 Correct 7 ms 19352 KB Output is correct
40 Correct 8 ms 19388 KB Output is correct
41 Correct 19 ms 19624 KB Output is correct
42 Correct 68 ms 20052 KB Output is correct
43 Incorrect 88 ms 51832 KB Output isn't correct
44 Halted 0 ms 0 KB -