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Submission #594589

# Submission time Handle Problem Language Result Execution time Memory
594589 2022-07-12T17:25:10 Z penguinhacker Dynamic Diameter (CEOI19_diameter) C++17
100 / 100
 410 ms 47820 KB 
#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define ar array

const int mxN=1e5;
int n, q, eu[mxN], ev[mxN], tin[mxN], tout[mxN];
ll wlim, ew[mxN], lz[1<<19];
vector<int> adj[mxN];
vector<ll> stk;

void dfs(int u=0, int p=-1, ll d=0) {
	tin[u]=stk.size();
	stk.push_back(d);
	for (int e : adj[u]) {
		int v=eu[e]^ev[e]^u;
		if (v!=p) {
			dfs(v, u, d+ew[e]);
			stk.push_back(d);
		}
	}
	tout[u]=stk.size()-1;
}

struct Node {
	ll ans, mn, mx, lhs, rhs;
} st[1<<19];

Node cmb(Node a, Node b) {
	return {
		max({a.ans, b.ans, a.rhs+b.mx, a.mx+b.lhs}),
		min(a.mn, b.mn),
		max(a.mx, b.mx),
		max({a.lhs, b.lhs, -2*a.mn+b.mx}),
		max({a.rhs, b.rhs, a.mx-2*b.mn})
	};
}

void bld(int u=1, int l=0, int r=2*n-2) {
	if (l==r) {
		st[u].mn=st[u].mx=stk[l];
		st[u].lhs=st[u].rhs=-stk[l];
		return;
	}
	int mid=(l+r)/2;
	bld(2*u, l, mid);
	bld(2*u+1, mid+1, r);
	st[u]=cmb(st[2*u], st[2*u+1]);
}

void psh(int u, int l, int r) {
	if (lz[u]) {
		st[u].mn+=lz[u], st[u].mx+=lz[u], st[u].lhs-=lz[u], st[u].rhs-=lz[u];
		if (l!=r)
			lz[2*u]+=lz[u], lz[2*u+1]+=lz[u];
		lz[u]=0;
	}
}

void upd(int ql, int qr, ll x, int u=1, int l=0, int r=2*n-2) {
	psh(u, l, r);
	if (l>qr||r<ql)
		return;
	if (ql<=l&&r<=qr) {
		lz[u]+=x;
		psh(u, l, r);
		return;
	}
	int mid=(l+r)/2;
	upd(ql, qr, x, 2*u, l, mid);
	upd(ql, qr, x, 2*u+1, mid+1, r);
	st[u]=cmb(st[2*u], st[2*u+1]);
}

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	cin >> n >> q >> wlim;
	for (int i=0; i<n-1; ++i) {
		cin >> eu[i] >> ev[i] >> ew[i], --eu[i], --ev[i];
		adj[eu[i]].push_back(i);
		adj[ev[i]].push_back(i);
	}
	dfs();
	bld();
	ll ans=0;
	while(q--) {
		int i;
		ll nxt;
		cin >> i >> nxt;
		i=(i+ans)%(n-1);
		nxt=(nxt+ans)%wlim;
		int u=tin[eu[i]]<tin[ev[i]]?ev[i]:eu[i];
		upd(tin[u], tout[u], nxt-ew[i]);
		ew[i]=nxt;
		cout << (ans=st[1].ans) << "\n";
	}
	return 0;
}

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 1 ms 2644 KB Output is correct
3 Correct 1 ms 2644 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 2 ms 2644 KB Output is correct
7 Correct 1 ms 2644 KB Output is correct
8 Correct 2 ms 2644 KB Output is correct
9 Correct 2 ms 2644 KB Output is correct
10 Correct 2 ms 2644 KB Output is correct
11 Correct 1 ms 2644 KB Output is correct
12 Correct 1 ms 2644 KB Output is correct
13 Correct 2 ms 2644 KB Output is correct
14 Correct 2 ms 2644 KB Output is correct
15 Correct 2 ms 2644 KB Output is correct
16 Correct 2 ms 2644 KB Output is correct
17 Correct 2 ms 2644 KB Output is correct
18 Correct 2 ms 2644 KB Output is correct

Subtask #2
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 1 ms 2644 KB Output is correct
3 Correct 1 ms 2644 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 2 ms 2644 KB Output is correct
7 Correct 1 ms 2644 KB Output is correct
8 Correct 2 ms 2644 KB Output is correct
9 Correct 2 ms 2644 KB Output is correct
10 Correct 2 ms 2644 KB Output is correct
11 Correct 1 ms 2644 KB Output is correct
12 Correct 1 ms 2644 KB Output is correct
13 Correct 2 ms 2644 KB Output is correct
14 Correct 2 ms 2644 KB Output is correct
15 Correct 2 ms 2644 KB Output is correct
16 Correct 2 ms 2644 KB Output is correct
17 Correct 2 ms 2644 KB Output is correct
18 Correct 2 ms 2644 KB Output is correct
19 Correct 6 ms 3028 KB Output is correct
20 Correct 5 ms 3084 KB Output is correct
21 Correct 6 ms 3056 KB Output is correct
22 Correct 6 ms 3016 KB Output is correct
23 Correct 9 ms 4876 KB Output is correct
24 Correct 9 ms 4820 KB Output is correct
25 Correct 9 ms 4932 KB Output is correct
26 Correct 15 ms 5272 KB Output is correct

Subtask #3
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 2 ms 2644 KB Output is correct
3 Correct 2 ms 2644 KB Output is correct
4 Correct 9 ms 2752 KB Output is correct
5 Correct 50 ms 3112 KB Output is correct
6 Correct 1 ms 2644 KB Output is correct
7 Correct 2 ms 2772 KB Output is correct
8 Correct 2 ms 2772 KB Output is correct
9 Correct 2 ms 2772 KB Output is correct
10 Correct 12 ms 2900 KB Output is correct
11 Correct 76 ms 4172 KB Output is correct
12 Correct 4 ms 4564 KB Output is correct
13 Correct 4 ms 4692 KB Output is correct
14 Correct 6 ms 4692 KB Output is correct
15 Correct 16 ms 5036 KB Output is correct
16 Correct 67 ms 6104 KB Output is correct
17 Correct 40 ms 31916 KB Output is correct
18 Correct 43 ms 32364 KB Output is correct
19 Correct 49 ms 34312 KB Output is correct
20 Correct 73 ms 35264 KB Output is correct
21 Correct 150 ms 36668 KB Output is correct

Subtask #4
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 2996 KB Output is correct
2 Correct 10 ms 3012 KB Output is correct
3 Correct 41 ms 3640 KB Output is correct
4 Correct 100 ms 4300 KB Output is correct
5 Correct 11 ms 6716 KB Output is correct
6 Correct 18 ms 6864 KB Output is correct
7 Correct 53 ms 7548 KB Output is correct
8 Correct 94 ms 8312 KB Output is correct
9 Correct 28 ms 19276 KB Output is correct
10 Correct 39 ms 19532 KB Output is correct
11 Correct 94 ms 20264 KB Output is correct
12 Correct 157 ms 21008 KB Output is correct
13 Correct 52 ms 35208 KB Output is correct
14 Correct 63 ms 36184 KB Output is correct
15 Correct 131 ms 36860 KB Output is correct
16 Correct 254 ms 37620 KB Output is correct
17 Correct 152 ms 36360 KB Output is correct

Subtask #5
24.0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 228 ms 37884 KB Output is correct
2 Correct 236 ms 40188 KB Output is correct
3 Correct 215 ms 40164 KB Output is correct
4 Correct 242 ms 40208 KB Output is correct
5 Correct 213 ms 39784 KB Output is correct
6 Correct 252 ms 38380 KB Output is correct
7 Correct 244 ms 43040 KB Output is correct
8 Correct 259 ms 43056 KB Output is correct
9 Correct 259 ms 43020 KB Output is correct
10 Correct 268 ms 42996 KB Output is correct
11 Correct 310 ms 42596 KB Output is correct
12 Correct 225 ms 40540 KB Output is correct
13 Correct 365 ms 47740 KB Output is correct
14 Correct 286 ms 47784 KB Output is correct
15 Correct 315 ms 47752 KB Output is correct
16 Correct 369 ms 47776 KB Output is correct
17 Correct 410 ms 46748 KB Output is correct
18 Correct 316 ms 42172 KB Output is correct
19 Correct 337 ms 47764 KB Output is correct
20 Correct 344 ms 47752 KB Output is correct
21 Correct 320 ms 47820 KB Output is correct
22 Correct 372 ms 47796 KB Output is correct
23 Correct 295 ms 46728 KB Output is correct
24 Correct 259 ms 42268 KB Output is correct

Subtask #6
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 1 ms 2644 KB Output is correct
3 Correct 1 ms 2644 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 2 ms 2644 KB Output is correct
7 Correct 1 ms 2644 KB Output is correct
8 Correct 2 ms 2644 KB Output is correct
9 Correct 2 ms 2644 KB Output is correct
10 Correct 2 ms 2644 KB Output is correct
11 Correct 1 ms 2644 KB Output is correct
12 Correct 1 ms 2644 KB Output is correct
13 Correct 2 ms 2644 KB Output is correct
14 Correct 2 ms 2644 KB Output is correct
15 Correct 2 ms 2644 KB Output is correct
16 Correct 2 ms 2644 KB Output is correct
17 Correct 2 ms 2644 KB Output is correct
18 Correct 2 ms 2644 KB Output is correct
19 Correct 6 ms 3028 KB Output is correct
20 Correct 5 ms 3084 KB Output is correct
21 Correct 6 ms 3056 KB Output is correct
22 Correct 6 ms 3016 KB Output is correct
23 Correct 9 ms 4876 KB Output is correct
24 Correct 9 ms 4820 KB Output is correct
25 Correct 9 ms 4932 KB Output is correct
26 Correct 15 ms 5272 KB Output is correct
27 Correct 1 ms 2644 KB Output is correct
28 Correct 2 ms 2644 KB Output is correct
29 Correct 2 ms 2644 KB Output is correct
30 Correct 9 ms 2752 KB Output is correct
31 Correct 50 ms 3112 KB Output is correct
32 Correct 1 ms 2644 KB Output is correct
33 Correct 2 ms 2772 KB Output is correct
34 Correct 2 ms 2772 KB Output is correct
35 Correct 2 ms 2772 KB Output is correct
36 Correct 12 ms 2900 KB Output is correct
37 Correct 76 ms 4172 KB Output is correct
38 Correct 4 ms 4564 KB Output is correct
39 Correct 4 ms 4692 KB Output is correct
40 Correct 6 ms 4692 KB Output is correct
41 Correct 16 ms 5036 KB Output is correct
42 Correct 67 ms 6104 KB Output is correct
43 Correct 40 ms 31916 KB Output is correct
44 Correct 43 ms 32364 KB Output is correct
45 Correct 49 ms 34312 KB Output is correct
46 Correct 73 ms 35264 KB Output is correct
47 Correct 150 ms 36668 KB Output is correct
48 Correct 3 ms 2996 KB Output is correct
49 Correct 10 ms 3012 KB Output is correct
50 Correct 41 ms 3640 KB Output is correct
51 Correct 100 ms 4300 KB Output is correct
52 Correct 11 ms 6716 KB Output is correct
53 Correct 18 ms 6864 KB Output is correct
54 Correct 53 ms 7548 KB Output is correct
55 Correct 94 ms 8312 KB Output is correct
56 Correct 28 ms 19276 KB Output is correct
57 Correct 39 ms 19532 KB Output is correct
58 Correct 94 ms 20264 KB Output is correct
59 Correct 157 ms 21008 KB Output is correct
60 Correct 52 ms 35208 KB Output is correct
61 Correct 63 ms 36184 KB Output is correct
62 Correct 131 ms 36860 KB Output is correct
63 Correct 254 ms 37620 KB Output is correct
64 Correct 152 ms 36360 KB Output is correct
65 Correct 228 ms 37884 KB Output is correct
66 Correct 236 ms 40188 KB Output is correct
67 Correct 215 ms 40164 KB Output is correct
68 Correct 242 ms 40208 KB Output is correct
69 Correct 213 ms 39784 KB Output is correct
70 Correct 252 ms 38380 KB Output is correct
71 Correct 244 ms 43040 KB Output is correct
72 Correct 259 ms 43056 KB Output is correct
73 Correct 259 ms 43020 KB Output is correct
74 Correct 268 ms 42996 KB Output is correct
75 Correct 310 ms 42596 KB Output is correct
76 Correct 225 ms 40540 KB Output is correct
77 Correct 365 ms 47740 KB Output is correct
78 Correct 286 ms 47784 KB Output is correct
79 Correct 315 ms 47752 KB Output is correct
80 Correct 369 ms 47776 KB Output is correct
81 Correct 410 ms 46748 KB Output is correct
82 Correct 316 ms 42172 KB Output is correct
83 Correct 337 ms 47764 KB Output is correct
84 Correct 344 ms 47752 KB Output is correct
85 Correct 320 ms 47820 KB Output is correct
86 Correct 372 ms 47796 KB Output is correct
87 Correct 295 ms 46728 KB Output is correct
88 Correct 259 ms 42268 KB Output is correct
89 Correct 279 ms 39124 KB Output is correct
90 Correct 225 ms 39516 KB Output is correct
91 Correct 284 ms 41040 KB Output is correct
92 Correct 240 ms 40964 KB Output is correct
93 Correct 280 ms 43796 KB Output is correct
94 Correct 248 ms 42752 KB Output is correct
95 Correct 295 ms 44736 KB Output is correct
96 Correct 287 ms 43528 KB Output is correct
97 Correct 299 ms 44664 KB Output is correct
98 Correct 277 ms 46888 KB Output is correct
99 Correct 271 ms 44440 KB Output is correct
100 Correct 284 ms 44280 KB Output is correct