#include<bits/stdc++.h>
using namespace std;
#define mp make_pair
#define INF 10000000
#define MOD 1000000007
#define MID ((l+r)/2)
#define HASHMOD 2305843009213693951
#define ll long long
#define ull unsigned long long
#define F first
#define S second
typedef pair<ll, ll> ii;
typedef pair<ii, ll> iii;
typedef vector<ll> vi;
typedef vector<ii> vii;
typedef map<ll, ll> mii;
#define EPS 1e-6
#define FOR(i,n) for(int i=0;i<((int)(n));i++)
#define FORi(i,a,b) for(int i=((int)(a));i<((int)(b));i++)
#define FOA(v, a) for(auto v : a)
ll t, n;
vi a, b;
vector<vii> adj;
ii f;
ll cnt=0;
vector<int> dfso;
void dfs(int s, int p=-1, ll d=0){
dfso[s] = cnt++;
if(d>f.F) f = max(f, {d, s});
FOA(v, adj[s]){
if(v.F!=p) dfs(v.F, s, d+v.S);
}
}
vector<int> pr;
struct node{
//ii l1={0,0}, l2={0,0};
set<ii> pa;
int w=0;
int id=1;
ll ans=0;
vector<node*> c;
vector<node*> all_c;
void build(int p=-1){
pr.push_back(id);
FOA(v,adj[id]){
if(v.F!=p){
c.push_back(new node());
c[c.size()-1]->w = v.S;
c[c.size()-1]->id = v.F;
c[c.size()-1]->build(id);
}
}
if(pa.size()==0) pa.insert({0,0});
FOA(v, c){
pa.insert({v->pa.rbegin()->F + v->w, v->id});
ans = max(ans, v->ans);
//else if(v->w + v->l2 > l2) l2 = v->l2 + v->w;
}
if(pa.size()>1) ans = max(ans, (*pa.rbegin()).F + (*(++pa.rbegin())).F);
//cout<<id<<" ("<<l1.F<<" "<<l1.S<<") ("<<l2.F<<" "<<l2.S<<")"<<" "<<ans<<endl;
}
void update(int s, ll t){
int pos = c.size()-1;
FOR(i,c.size()-1){
if(dfso[c[i]->id] <= dfso[s] && dfso[s] < dfso[c[i+1]->id]) pos = i;
}
if(s==id){
//cout<<"CHAINGE "<<s<<endl;
w = t;
}
else{
pa.erase({ c[pos]->pa.rbegin()->F + c[pos]->w, c[pos]->id});
c[pos]->update(s, t);
pa.insert({c[pos]->pa.rbegin()->F + c[pos]->w, c[pos]->id});
//node*v = c[pos];
ans = 0;
FOA(v, c){
ans = max(ans, v->ans);
}
if(pa.size()>1) ans = max(ans, (*pa.rbegin()).F + (*(++pa.rbegin())).F);
}
}
};
int main(){
int q;
ll w;
cin>>n>>q>>w;
adj.assign(n+1, vii());
dfso.assign(n+1, 0);
vector<pair<ii,ii> > edg(n-1);
set<ii> ws;
vi wu(n);
FOR(i,n-1){
ll a, b, c;
cin>>a>>b>>c;
ws.insert({-c, i});
wu[i] = c;
edg[i] = {{a, adj[a].size()}, {b, adj[b].size()}};
adj[a].push_back({b,c});
adj[b].push_back({a,c});
}
node root;
root.build();
ll last=0;
dfs(1);
//FOR(i,n) cout<<dfso[i+1]<<" "; cout<<endl;
while(q--){
ll a, b;
cin>>a>>b;
//cout<<"UPDATE\n";
a= (a + last) % (n-1);
b = (b+last) % w;
adj[edg[a].F.F][edg[a].F.S].S = b;
adj[edg[a].S.F][edg[a].S.S].S = b;
f = {0,1};
//dfs(1);
//dfs(f.S);
//cout<<a<<" "<<b<<endl;
//cout<<"edg "<<edg[a].F.F<<" "<<edg[a].S.F<<endl;
int upn = max(ii(dfso[edg[a].F.F], edg[a].F.F),ii(dfso[edg[a].S.F], edg[a].S.F)).S;
//cout<<"pos "<<upn<<endl;
root.update(upn, b);
//last = f.F;
last = root.ans;
cout<<last<<endl;
}
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
204 KB |
Output is correct |
2 |
Correct |
1 ms |
204 KB |
Output is correct |
3 |
Correct |
1 ms |
204 KB |
Output is correct |
4 |
Correct |
0 ms |
204 KB |
Output is correct |
5 |
Correct |
1 ms |
204 KB |
Output is correct |
6 |
Correct |
1 ms |
204 KB |
Output is correct |
7 |
Correct |
1 ms |
204 KB |
Output is correct |
8 |
Correct |
1 ms |
204 KB |
Output is correct |
9 |
Correct |
1 ms |
204 KB |
Output is correct |
10 |
Correct |
1 ms |
204 KB |
Output is correct |
11 |
Correct |
1 ms |
204 KB |
Output is correct |
12 |
Correct |
1 ms |
204 KB |
Output is correct |
13 |
Correct |
1 ms |
332 KB |
Output is correct |
14 |
Correct |
1 ms |
332 KB |
Output is correct |
15 |
Correct |
1 ms |
332 KB |
Output is correct |
16 |
Correct |
1 ms |
332 KB |
Output is correct |
17 |
Correct |
1 ms |
332 KB |
Output is correct |
18 |
Correct |
1 ms |
332 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
204 KB |
Output is correct |
2 |
Correct |
1 ms |
204 KB |
Output is correct |
3 |
Correct |
1 ms |
204 KB |
Output is correct |
4 |
Correct |
0 ms |
204 KB |
Output is correct |
5 |
Correct |
1 ms |
204 KB |
Output is correct |
6 |
Correct |
1 ms |
204 KB |
Output is correct |
7 |
Correct |
1 ms |
204 KB |
Output is correct |
8 |
Correct |
1 ms |
204 KB |
Output is correct |
9 |
Correct |
1 ms |
204 KB |
Output is correct |
10 |
Correct |
1 ms |
204 KB |
Output is correct |
11 |
Correct |
1 ms |
204 KB |
Output is correct |
12 |
Correct |
1 ms |
204 KB |
Output is correct |
13 |
Correct |
1 ms |
332 KB |
Output is correct |
14 |
Correct |
1 ms |
332 KB |
Output is correct |
15 |
Correct |
1 ms |
332 KB |
Output is correct |
16 |
Correct |
1 ms |
332 KB |
Output is correct |
17 |
Correct |
1 ms |
332 KB |
Output is correct |
18 |
Correct |
1 ms |
332 KB |
Output is correct |
19 |
Correct |
18 ms |
716 KB |
Output is correct |
20 |
Correct |
25 ms |
716 KB |
Output is correct |
21 |
Correct |
49 ms |
780 KB |
Output is correct |
22 |
Correct |
96 ms |
844 KB |
Output is correct |
23 |
Correct |
39 ms |
2596 KB |
Output is correct |
24 |
Correct |
63 ms |
2508 KB |
Output is correct |
25 |
Correct |
171 ms |
2680 KB |
Output is correct |
26 |
Correct |
922 ms |
3268 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
204 KB |
Output is correct |
2 |
Correct |
1 ms |
204 KB |
Output is correct |
3 |
Correct |
4 ms |
308 KB |
Output is correct |
4 |
Correct |
39 ms |
328 KB |
Output is correct |
5 |
Correct |
195 ms |
704 KB |
Output is correct |
6 |
Correct |
0 ms |
204 KB |
Output is correct |
7 |
Correct |
2 ms |
460 KB |
Output is correct |
8 |
Correct |
2 ms |
460 KB |
Output is correct |
9 |
Correct |
8 ms |
528 KB |
Output is correct |
10 |
Correct |
67 ms |
552 KB |
Output is correct |
11 |
Correct |
337 ms |
908 KB |
Output is correct |
12 |
Correct |
9 ms |
2560 KB |
Output is correct |
13 |
Correct |
13 ms |
2520 KB |
Output is correct |
14 |
Correct |
39 ms |
2520 KB |
Output is correct |
15 |
Correct |
399 ms |
2628 KB |
Output is correct |
16 |
Correct |
1725 ms |
2992 KB |
Output is correct |
17 |
Correct |
197 ms |
44136 KB |
Output is correct |
18 |
Correct |
459 ms |
44024 KB |
Output is correct |
19 |
Correct |
2783 ms |
44280 KB |
Output is correct |
20 |
Execution timed out |
5059 ms |
44164 KB |
Time limit exceeded |
21 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
4 ms |
716 KB |
Output is correct |
2 |
Correct |
24 ms |
800 KB |
Output is correct |
3 |
Correct |
109 ms |
980 KB |
Output is correct |
4 |
Correct |
227 ms |
1264 KB |
Output is correct |
5 |
Correct |
16 ms |
4812 KB |
Output is correct |
6 |
Correct |
41 ms |
4820 KB |
Output is correct |
7 |
Correct |
135 ms |
5108 KB |
Output is correct |
8 |
Correct |
254 ms |
5444 KB |
Output is correct |
9 |
Correct |
78 ms |
23104 KB |
Output is correct |
10 |
Correct |
144 ms |
23016 KB |
Output is correct |
11 |
Correct |
211 ms |
23336 KB |
Output is correct |
12 |
Correct |
364 ms |
23616 KB |
Output is correct |
13 |
Correct |
181 ms |
45684 KB |
Output is correct |
14 |
Correct |
193 ms |
45760 KB |
Output is correct |
15 |
Correct |
329 ms |
46168 KB |
Output is correct |
16 |
Correct |
471 ms |
46268 KB |
Output is correct |
17 |
Correct |
667 ms |
46304 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Execution timed out |
5055 ms |
46484 KB |
Time limit exceeded |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
204 KB |
Output is correct |
2 |
Correct |
1 ms |
204 KB |
Output is correct |
3 |
Correct |
1 ms |
204 KB |
Output is correct |
4 |
Correct |
0 ms |
204 KB |
Output is correct |
5 |
Correct |
1 ms |
204 KB |
Output is correct |
6 |
Correct |
1 ms |
204 KB |
Output is correct |
7 |
Correct |
1 ms |
204 KB |
Output is correct |
8 |
Correct |
1 ms |
204 KB |
Output is correct |
9 |
Correct |
1 ms |
204 KB |
Output is correct |
10 |
Correct |
1 ms |
204 KB |
Output is correct |
11 |
Correct |
1 ms |
204 KB |
Output is correct |
12 |
Correct |
1 ms |
204 KB |
Output is correct |
13 |
Correct |
1 ms |
332 KB |
Output is correct |
14 |
Correct |
1 ms |
332 KB |
Output is correct |
15 |
Correct |
1 ms |
332 KB |
Output is correct |
16 |
Correct |
1 ms |
332 KB |
Output is correct |
17 |
Correct |
1 ms |
332 KB |
Output is correct |
18 |
Correct |
1 ms |
332 KB |
Output is correct |
19 |
Correct |
18 ms |
716 KB |
Output is correct |
20 |
Correct |
25 ms |
716 KB |
Output is correct |
21 |
Correct |
49 ms |
780 KB |
Output is correct |
22 |
Correct |
96 ms |
844 KB |
Output is correct |
23 |
Correct |
39 ms |
2596 KB |
Output is correct |
24 |
Correct |
63 ms |
2508 KB |
Output is correct |
25 |
Correct |
171 ms |
2680 KB |
Output is correct |
26 |
Correct |
922 ms |
3268 KB |
Output is correct |
27 |
Correct |
0 ms |
204 KB |
Output is correct |
28 |
Correct |
1 ms |
204 KB |
Output is correct |
29 |
Correct |
4 ms |
308 KB |
Output is correct |
30 |
Correct |
39 ms |
328 KB |
Output is correct |
31 |
Correct |
195 ms |
704 KB |
Output is correct |
32 |
Correct |
0 ms |
204 KB |
Output is correct |
33 |
Correct |
2 ms |
460 KB |
Output is correct |
34 |
Correct |
2 ms |
460 KB |
Output is correct |
35 |
Correct |
8 ms |
528 KB |
Output is correct |
36 |
Correct |
67 ms |
552 KB |
Output is correct |
37 |
Correct |
337 ms |
908 KB |
Output is correct |
38 |
Correct |
9 ms |
2560 KB |
Output is correct |
39 |
Correct |
13 ms |
2520 KB |
Output is correct |
40 |
Correct |
39 ms |
2520 KB |
Output is correct |
41 |
Correct |
399 ms |
2628 KB |
Output is correct |
42 |
Correct |
1725 ms |
2992 KB |
Output is correct |
43 |
Correct |
197 ms |
44136 KB |
Output is correct |
44 |
Correct |
459 ms |
44024 KB |
Output is correct |
45 |
Correct |
2783 ms |
44280 KB |
Output is correct |
46 |
Execution timed out |
5059 ms |
44164 KB |
Time limit exceeded |
47 |
Halted |
0 ms |
0 KB |
- |