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Submission #872125

# Submission time Handle Problem Language Result Execution time Memory
872125 2023-11-12T10:49:28 Z Trisanu_Das Dynamic Diameter (CEOI19_diameter) C++17
100 / 100
 254 ms 48064 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 8536 KB Output is correct
2 Correct 1 ms 8536 KB Output is correct
3 Correct 1 ms 8540 KB Output is correct
4 Correct 1 ms 8540 KB Output is correct
5 Correct 1 ms 8536 KB Output is correct
6 Correct 1 ms 8540 KB Output is correct
7 Correct 1 ms 8536 KB Output is correct
8 Correct 1 ms 8540 KB Output is correct
9 Correct 1 ms 8540 KB Output is correct
10 Correct 1 ms 8540 KB Output is correct
11 Correct 2 ms 8540 KB Output is correct
12 Correct 1 ms 8540 KB Output is correct
13 Correct 1 ms 8540 KB Output is correct
14 Correct 1 ms 8540 KB Output is correct
15 Correct 1 ms 8540 KB Output is correct
16 Correct 1 ms 8540 KB Output is correct
17 Correct 2 ms 8748 KB Output is correct
18 Correct 1 ms 8540 KB Output is correct

Subtask #2
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 8536 KB Output is correct
2 Correct 1 ms 8536 KB Output is correct
3 Correct 1 ms 8540 KB Output is correct
4 Correct 1 ms 8540 KB Output is correct
5 Correct 1 ms 8536 KB Output is correct
6 Correct 1 ms 8540 KB Output is correct
7 Correct 1 ms 8536 KB Output is correct
8 Correct 1 ms 8540 KB Output is correct
9 Correct 1 ms 8540 KB Output is correct
10 Correct 1 ms 8540 KB Output is correct
11 Correct 2 ms 8540 KB Output is correct
12 Correct 1 ms 8540 KB Output is correct
13 Correct 1 ms 8540 KB Output is correct
14 Correct 1 ms 8540 KB Output is correct
15 Correct 1 ms 8540 KB Output is correct
16 Correct 1 ms 8540 KB Output is correct
17 Correct 2 ms 8748 KB Output is correct
18 Correct 1 ms 8540 KB Output is correct
19 Correct 5 ms 8796 KB Output is correct
20 Correct 5 ms 8972 KB Output is correct
21 Correct 5 ms 8820 KB Output is correct
22 Correct 6 ms 9008 KB Output is correct
23 Correct 6 ms 11248 KB Output is correct
24 Correct 8 ms 11456 KB Output is correct
25 Correct 7 ms 11356 KB Output is correct
26 Correct 8 ms 11612 KB Output is correct

Subtask #3
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 8544 KB Output is correct
2 Correct 1 ms 8540 KB Output is correct
3 Correct 2 ms 8540 KB Output is correct
4 Correct 8 ms 8884 KB Output is correct
5 Correct 34 ms 9604 KB Output is correct
6 Correct 2 ms 8664 KB Output is correct
7 Correct 1 ms 8796 KB Output is correct
8 Correct 2 ms 8796 KB Output is correct
9 Correct 3 ms 8796 KB Output is correct
10 Correct 10 ms 8884 KB Output is correct
11 Correct 48 ms 10064 KB Output is correct
12 Correct 3 ms 11356 KB Output is correct
13 Correct 3 ms 11356 KB Output is correct
14 Correct 4 ms 11356 KB Output is correct
15 Correct 19 ms 11636 KB Output is correct
16 Correct 59 ms 12628 KB Output is correct
17 Correct 31 ms 34128 KB Output is correct
18 Correct 31 ms 34344 KB Output is correct
19 Correct 33 ms 35652 KB Output is correct
20 Correct 47 ms 36432 KB Output is correct
21 Correct 117 ms 37828 KB Output is correct

Subtask #4
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8792 KB Output is correct
2 Correct 8 ms 9052 KB Output is correct
3 Correct 33 ms 9560 KB Output is correct
4 Correct 62 ms 10068 KB Output is correct
5 Correct 6 ms 13528 KB Output is correct
6 Correct 13 ms 13888 KB Output is correct
7 Correct 43 ms 14380 KB Output is correct
8 Correct 82 ms 15124 KB Output is correct
9 Correct 19 ms 22484 KB Output is correct
10 Correct 30 ms 22992 KB Output is correct
11 Correct 65 ms 23496 KB Output is correct
12 Correct 109 ms 24204 KB Output is correct
13 Correct 37 ms 35520 KB Output is correct
14 Correct 48 ms 36292 KB Output is correct
15 Correct 86 ms 36884 KB Output is correct
16 Correct 136 ms 37832 KB Output is correct
17 Correct 116 ms 37564 KB Output is correct

Subtask #5
24.0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 150 ms 40264 KB Output is correct
2 Correct 156 ms 40212 KB Output is correct
3 Correct 153 ms 40132 KB Output is correct
4 Correct 153 ms 40252 KB Output is correct
5 Correct 156 ms 40132 KB Output is correct
6 Correct 135 ms 39492 KB Output is correct
7 Correct 167 ms 43204 KB Output is correct
8 Correct 181 ms 43464 KB Output is correct
9 Correct 170 ms 43072 KB Output is correct
10 Correct 168 ms 43152 KB Output is correct
11 Correct 173 ms 42944 KB Output is correct
12 Correct 158 ms 41540 KB Output is correct
13 Correct 196 ms 47804 KB Output is correct
14 Correct 208 ms 47976 KB Output is correct
15 Correct 211 ms 47988 KB Output is correct
16 Correct 200 ms 47808 KB Output is correct
17 Correct 199 ms 47312 KB Output is correct
18 Correct 178 ms 43320 KB Output is correct
19 Correct 198 ms 47732 KB Output is correct
20 Correct 199 ms 48064 KB Output is correct
21 Correct 195 ms 47940 KB Output is correct
22 Correct 216 ms 47948 KB Output is correct
23 Correct 198 ms 47144 KB Output is correct
24 Correct 178 ms 44484 KB Output is correct

Subtask #6
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 8536 KB Output is correct
2 Correct 1 ms 8536 KB Output is correct
3 Correct 1 ms 8540 KB Output is correct
4 Correct 1 ms 8540 KB Output is correct
5 Correct 1 ms 8536 KB Output is correct
6 Correct 1 ms 8540 KB Output is correct
7 Correct 1 ms 8536 KB Output is correct
8 Correct 1 ms 8540 KB Output is correct
9 Correct 1 ms 8540 KB Output is correct
10 Correct 1 ms 8540 KB Output is correct
11 Correct 2 ms 8540 KB Output is correct
12 Correct 1 ms 8540 KB Output is correct
13 Correct 1 ms 8540 KB Output is correct
14 Correct 1 ms 8540 KB Output is correct
15 Correct 1 ms 8540 KB Output is correct
16 Correct 1 ms 8540 KB Output is correct
17 Correct 2 ms 8748 KB Output is correct
18 Correct 1 ms 8540 KB Output is correct
19 Correct 5 ms 8796 KB Output is correct
20 Correct 5 ms 8972 KB Output is correct
21 Correct 5 ms 8820 KB Output is correct
22 Correct 6 ms 9008 KB Output is correct
23 Correct 6 ms 11248 KB Output is correct
24 Correct 8 ms 11456 KB Output is correct
25 Correct 7 ms 11356 KB Output is correct
26 Correct 8 ms 11612 KB Output is correct
27 Correct 1 ms 8544 KB Output is correct
28 Correct 1 ms 8540 KB Output is correct
29 Correct 2 ms 8540 KB Output is correct
30 Correct 8 ms 8884 KB Output is correct
31 Correct 34 ms 9604 KB Output is correct
32 Correct 2 ms 8664 KB Output is correct
33 Correct 1 ms 8796 KB Output is correct
34 Correct 2 ms 8796 KB Output is correct
35 Correct 3 ms 8796 KB Output is correct
36 Correct 10 ms 8884 KB Output is correct
37 Correct 48 ms 10064 KB Output is correct
38 Correct 3 ms 11356 KB Output is correct
39 Correct 3 ms 11356 KB Output is correct
40 Correct 4 ms 11356 KB Output is correct
41 Correct 19 ms 11636 KB Output is correct
42 Correct 59 ms 12628 KB Output is correct
43 Correct 31 ms 34128 KB Output is correct
44 Correct 31 ms 34344 KB Output is correct
45 Correct 33 ms 35652 KB Output is correct
46 Correct 47 ms 36432 KB Output is correct
47 Correct 117 ms 37828 KB Output is correct
48 Correct 2 ms 8792 KB Output is correct
49 Correct 8 ms 9052 KB Output is correct
50 Correct 33 ms 9560 KB Output is correct
51 Correct 62 ms 10068 KB Output is correct
52 Correct 6 ms 13528 KB Output is correct
53 Correct 13 ms 13888 KB Output is correct
54 Correct 43 ms 14380 KB Output is correct
55 Correct 82 ms 15124 KB Output is correct
56 Correct 19 ms 22484 KB Output is correct
57 Correct 30 ms 22992 KB Output is correct
58 Correct 65 ms 23496 KB Output is correct
59 Correct 109 ms 24204 KB Output is correct
60 Correct 37 ms 35520 KB Output is correct
61 Correct 48 ms 36292 KB Output is correct
62 Correct 86 ms 36884 KB Output is correct
63 Correct 136 ms 37832 KB Output is correct
64 Correct 116 ms 37564 KB Output is correct
65 Correct 150 ms 40264 KB Output is correct
66 Correct 156 ms 40212 KB Output is correct
67 Correct 153 ms 40132 KB Output is correct
68 Correct 153 ms 40252 KB Output is correct
69 Correct 156 ms 40132 KB Output is correct
70 Correct 135 ms 39492 KB Output is correct
71 Correct 167 ms 43204 KB Output is correct
72 Correct 181 ms 43464 KB Output is correct
73 Correct 170 ms 43072 KB Output is correct
74 Correct 168 ms 43152 KB Output is correct
75 Correct 173 ms 42944 KB Output is correct
76 Correct 158 ms 41540 KB Output is correct
77 Correct 196 ms 47804 KB Output is correct
78 Correct 208 ms 47976 KB Output is correct
79 Correct 211 ms 47988 KB Output is correct
80 Correct 200 ms 47808 KB Output is correct
81 Correct 199 ms 47312 KB Output is correct
82 Correct 178 ms 43320 KB Output is correct
83 Correct 198 ms 47732 KB Output is correct
84 Correct 199 ms 48064 KB Output is correct
85 Correct 195 ms 47940 KB Output is correct
86 Correct 216 ms 47948 KB Output is correct
87 Correct 198 ms 47144 KB Output is correct
88 Correct 178 ms 44484 KB Output is correct
89 Correct 148 ms 39368 KB Output is correct
90 Correct 149 ms 39620 KB Output is correct
91 Correct 157 ms 41160 KB Output is correct
92 Correct 162 ms 40960 KB Output is correct
93 Correct 172 ms 43804 KB Output is correct
94 Correct 200 ms 42720 KB Output is correct
95 Correct 244 ms 44928 KB Output is correct
96 Correct 215 ms 43708 KB Output is correct
97 Correct 238 ms 44884 KB Output is correct
98 Correct 226 ms 47196 KB Output is correct
99 Correct 226 ms 44368 KB Output is correct
100 Correct 254 ms 44380 KB Output is correct