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Submission #856237

# Submission time Handle Problem Language Result Execution time Memory
856237 2023-10-02T21:08:19 Z mbfibat Dynamic Diameter (CEOI19_diameter) C++17
49 / 100
 116 ms 35528 KB 
#include <bits/stdc++.h>

using namespace std;

const int N = 2e5 + 11;

typedef pair<int, int> ii;

int n, q, w;
int a[N];
int cost[N];
ii E[N];
vector<int> adj[N], pos[N];

int top = 0;
void dfs(int u, int id_edge, int p = 0) {
	for (int id : adj[u]) {
		int x = E[id].first, y = E[id].second;
		if (x == u) swap(x, y);
		if (x == p) continue;

		a[++top] = cost[id];
		pos[id].push_back(top);
		dfs(x, id, u);
	}
	if (p) {
		a[++top] = -cost[id_edge];
		pos[id_edge].push_back(top);
	}
}

struct Node {
	int pfix, sfix; // pfix get maximum prefix sum, sfix get maximum -suffix sum
	int ans_pre, ans_suf; // f but ans_pre touch left, ans_suf touch right
	int all; // f but touch left and touch right
	int sum, f;
	Node(){}
};

Node Seg[4 * N];

void merge(int node) {	
	Seg[node].pfix = max(Seg[node * 2].pfix, Seg[node * 2].sum + Seg[node * 2 + 1].pfix);
	Seg[node].sfix = max(Seg[node * 2 + 1].sfix, -Seg[node * 2 + 1].sum + Seg[node * 2].sfix);

	Seg[node].sum = Seg[node * 2].sum + Seg[node * 2 + 1].sum;

	Seg[node].all = max(Seg[node * 2].all + Seg[node * 2 + 1].sum, -Seg[node * 2].sum + Seg[node * 2 + 1].all);

	Seg[node].ans_pre = max(max(Seg[node * 2].ans_pre, Seg[node * 2].all + Seg[node * 2 + 1].pfix), -Seg[node * 2].sum + Seg[node * 2 + 1].ans_pre);
	Seg[node].ans_suf = max(max(Seg[node * 2 + 1].ans_suf, Seg[node * 2 + 1].all + Seg[node * 2].sfix), Seg[node * 2 + 1].sum + Seg[node * 2].ans_suf);

	Seg[node].f = max(Seg[node * 2].f, Seg[node * 2 + 1].f);
	Seg[node].f = max(Seg[node].f, Seg[node * 2].ans_suf + Seg[node * 2 + 1].pfix);
	Seg[node].f = max(Seg[node].f, Seg[node * 2].sfix + Seg[node * 2 + 1].ans_pre);
}

void build(int node, int l, int r) {
	if (l == r) {
		Seg[node].pfix = max(0, a[l]); Seg[node].sfix = max(0, -a[l]);
		Seg[node].f = Seg[node].ans_pre = Seg[node].ans_suf = Seg[node].all = abs(a[l]);
		Seg[node].sum = a[l];
		return;		
	}

	int mi = (l + r) / 2;
	build(node * 2, l, mi);
	build(node * 2 + 1, mi + 1, r);

	merge(node);
	return;
}

void upd(int node, int l, int r, int pos) {
	if (l == r) {
		Seg[node].pfix = max(0, a[l]); Seg[node].sfix = max(0, -a[l]);
		Seg[node].f = Seg[node].ans_pre = Seg[node].ans_suf = Seg[node].all = abs(a[l]);
		Seg[node].sum = a[l];
		return;		
	}

	int mi = (l + r) / 2;
	if (pos <= mi) upd(node * 2, l, mi, pos);
	else upd(node * 2 + 1, mi + 1, r, pos);

	merge(node);

	return;
}

int main(int argc, char** argv) {
	ios::sync_with_stdio(false);
	cin.tie(0); cout.tie(0);

	cin >> n >> q >> w;
	for (int i = 0; i < n - 1; i++) {
		int u, v, c; 
		cin >> u >> v >> cost[i];
		E[i] = ii(u, v);

		adj[u].emplace_back(i);		
		adj[v].emplace_back(i);		
	}
	dfs(1, -1);

	build(1, 1, 2 * (n - 1));

	int last = 0;
	while (q--) {
		int d, e; cin >> d >> e;
		d = (d + last) % (n - 1);
		e = (e + last) % w;		

  		a[pos[d][0]] = e;
  		upd(1, 1, 2 * (n - 1), pos[d][0]);
  		a[pos[d][1]] = -e;
  		upd(1, 1, 2 * (n - 1), pos[d][1]);

  		last = Seg[1].f;
		cout << last << '\n';
	}
}

Compilation message

diameter.cpp: In function 'int main(int, char**)':
diameter.cpp:97:13: warning: unused variable 'c' [-Wunused-variable]
   97 |   int u, v, c;
      |             ^

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 12636 KB Output is correct
2 Correct 2 ms 12744 KB Output is correct
3 Correct 2 ms 12636 KB Output is correct
4 Correct 2 ms 12636 KB Output is correct
5 Correct 2 ms 12636 KB Output is correct
6 Correct 3 ms 12636 KB Output is correct
7 Correct 2 ms 12636 KB Output is correct
8 Correct 2 ms 12736 KB Output is correct
9 Correct 2 ms 12636 KB Output is correct
10 Correct 2 ms 12636 KB Output is correct
11 Correct 2 ms 12636 KB Output is correct
12 Correct 2 ms 12636 KB Output is correct
13 Correct 2 ms 12888 KB Output is correct
14 Correct 2 ms 12636 KB Output is correct
15 Correct 3 ms 12636 KB Output is correct
16 Correct 2 ms 12720 KB Output is correct
17 Correct 2 ms 12636 KB Output is correct
18 Correct 2 ms 12728 KB Output is correct

Subtask #2
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 12636 KB Output is correct
2 Correct 2 ms 12744 KB Output is correct
3 Correct 2 ms 12636 KB Output is correct
4 Correct 2 ms 12636 KB Output is correct
5 Correct 2 ms 12636 KB Output is correct
6 Correct 3 ms 12636 KB Output is correct
7 Correct 2 ms 12636 KB Output is correct
8 Correct 2 ms 12736 KB Output is correct
9 Correct 2 ms 12636 KB Output is correct
10 Correct 2 ms 12636 KB Output is correct
11 Correct 2 ms 12636 KB Output is correct
12 Correct 2 ms 12636 KB Output is correct
13 Correct 2 ms 12888 KB Output is correct
14 Correct 2 ms 12636 KB Output is correct
15 Correct 3 ms 12636 KB Output is correct
16 Correct 2 ms 12720 KB Output is correct
17 Correct 2 ms 12636 KB Output is correct
18 Correct 2 ms 12728 KB Output is correct
19 Correct 5 ms 12980 KB Output is correct
20 Correct 5 ms 12892 KB Output is correct
21 Correct 5 ms 12892 KB Output is correct
22 Correct 5 ms 12892 KB Output is correct
23 Correct 7 ms 15196 KB Output is correct
24 Correct 10 ms 15280 KB Output is correct
25 Correct 7 ms 15196 KB Output is correct
26 Correct 8 ms 15560 KB Output is correct

Subtask #3
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 12632 KB Output is correct
2 Correct 4 ms 12636 KB Output is correct
3 Correct 3 ms 12636 KB Output is correct
4 Correct 9 ms 12636 KB Output is correct
5 Correct 32 ms 13060 KB Output is correct
6 Correct 2 ms 12636 KB Output is correct
7 Correct 2 ms 12636 KB Output is correct
8 Correct 2 ms 12636 KB Output is correct
9 Correct 3 ms 12636 KB Output is correct
10 Correct 11 ms 12900 KB Output is correct
11 Correct 42 ms 13136 KB Output is correct
12 Correct 5 ms 15348 KB Output is correct
13 Correct 5 ms 15296 KB Output is correct
14 Correct 6 ms 15196 KB Output is correct
15 Correct 15 ms 15252 KB Output is correct
16 Correct 54 ms 15696 KB Output is correct
17 Correct 32 ms 34760 KB Output is correct
18 Correct 32 ms 34964 KB Output is correct
19 Correct 34 ms 35024 KB Output is correct
20 Correct 46 ms 35016 KB Output is correct
21 Correct 116 ms 35528 KB Output is correct

Subtask #4
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 12892 KB Output is correct
2 Correct 7 ms 12892 KB Output is correct
3 Correct 24 ms 13076 KB Output is correct
4 Correct 47 ms 13428 KB Output is correct
5 Correct 7 ms 15708 KB Output is correct
6 Correct 11 ms 15708 KB Output is correct
7 Correct 32 ms 15952 KB Output is correct
8 Correct 62 ms 16352 KB Output is correct
9 Correct 21 ms 24664 KB Output is correct
10 Correct 26 ms 24696 KB Output is correct
11 Correct 53 ms 24912 KB Output is correct
12 Correct 87 ms 25144 KB Output is correct
13 Correct 37 ms 34388 KB Output is correct
14 Correct 45 ms 34644 KB Output is correct
15 Correct 78 ms 34900 KB Output is correct
16 Correct 107 ms 35048 KB Output is correct
17 Correct 115 ms 35120 KB Output is correct

Subtask #5
0 / 24.0

# Verdict Execution time Memory Grader output
1 Runtime error 11 ms 25436 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #6
0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 12636 KB Output is correct
2 Correct 2 ms 12744 KB Output is correct
3 Correct 2 ms 12636 KB Output is correct
4 Correct 2 ms 12636 KB Output is correct
5 Correct 2 ms 12636 KB Output is correct
6 Correct 3 ms 12636 KB Output is correct
7 Correct 2 ms 12636 KB Output is correct
8 Correct 2 ms 12736 KB Output is correct
9 Correct 2 ms 12636 KB Output is correct
10 Correct 2 ms 12636 KB Output is correct
11 Correct 2 ms 12636 KB Output is correct
12 Correct 2 ms 12636 KB Output is correct
13 Correct 2 ms 12888 KB Output is correct
14 Correct 2 ms 12636 KB Output is correct
15 Correct 3 ms 12636 KB Output is correct
16 Correct 2 ms 12720 KB Output is correct
17 Correct 2 ms 12636 KB Output is correct
18 Correct 2 ms 12728 KB Output is correct
19 Correct 5 ms 12980 KB Output is correct
20 Correct 5 ms 12892 KB Output is correct
21 Correct 5 ms 12892 KB Output is correct
22 Correct 5 ms 12892 KB Output is correct
23 Correct 7 ms 15196 KB Output is correct
24 Correct 10 ms 15280 KB Output is correct
25 Correct 7 ms 15196 KB Output is correct
26 Correct 8 ms 15560 KB Output is correct
27 Correct 2 ms 12632 KB Output is correct
28 Correct 4 ms 12636 KB Output is correct
29 Correct 3 ms 12636 KB Output is correct
30 Correct 9 ms 12636 KB Output is correct
31 Correct 32 ms 13060 KB Output is correct
32 Correct 2 ms 12636 KB Output is correct
33 Correct 2 ms 12636 KB Output is correct
34 Correct 2 ms 12636 KB Output is correct
35 Correct 3 ms 12636 KB Output is correct
36 Correct 11 ms 12900 KB Output is correct
37 Correct 42 ms 13136 KB Output is correct
38 Correct 5 ms 15348 KB Output is correct
39 Correct 5 ms 15296 KB Output is correct
40 Correct 6 ms 15196 KB Output is correct
41 Correct 15 ms 15252 KB Output is correct
42 Correct 54 ms 15696 KB Output is correct
43 Correct 32 ms 34760 KB Output is correct
44 Correct 32 ms 34964 KB Output is correct
45 Correct 34 ms 35024 KB Output is correct
46 Correct 46 ms 35016 KB Output is correct
47 Correct 116 ms 35528 KB Output is correct
48 Correct 3 ms 12892 KB Output is correct
49 Correct 7 ms 12892 KB Output is correct
50 Correct 24 ms 13076 KB Output is correct
51 Correct 47 ms 13428 KB Output is correct
52 Correct 7 ms 15708 KB Output is correct
53 Correct 11 ms 15708 KB Output is correct
54 Correct 32 ms 15952 KB Output is correct
55 Correct 62 ms 16352 KB Output is correct
56 Correct 21 ms 24664 KB Output is correct
57 Correct 26 ms 24696 KB Output is correct
58 Correct 53 ms 24912 KB Output is correct
59 Correct 87 ms 25144 KB Output is correct
60 Correct 37 ms 34388 KB Output is correct
61 Correct 45 ms 34644 KB Output is correct
62 Correct 78 ms 34900 KB Output is correct
63 Correct 107 ms 35048 KB Output is correct
64 Correct 115 ms 35120 KB Output is correct
65 Runtime error 11 ms 25436 KB Execution killed with signal 11
66 Halted 0 ms 0 KB -