#include<bits/stdc++.h>
#ifdef LOCAL
#include "Essentials/algo/debug.h"
#else
#define debug(...) 69
#endif
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
const int N = 3e5+ 23;
const ll inf = 1e18;
#define F first
#define S second
#define pb push_back
#define kill(x) cout<<x<<endl, exit(0);
#define all(x) x.begin(),x.end()
#define sz(x) (int)x.size()
#define lc (v << 1)
#define rc ((v<<1) |1)
#define int ll
struct node {
int diam;
int leftMax;
int rightMax;
int mxh,mnh;
int lz;
void set(int h) {
diam = 0;
leftMax = -h;
rightMax = -h;
mxh = h,mnh = h;
lz = 0;
}
void merge(node a,node b) {
mxh = max(a.mxh,b.mxh);
mnh = min(a.mnh,b.mnh);
leftMax = max({a.leftMax, b.leftMax ,b.mxh - 2*a.mnh});
rightMax =max({a.rightMax,b.rightMax,a.mxh - 2*b.mnh});
diam = max({ a.diam, b.diam, a.rightMax + b.mxh , b.leftMax+ a.mxh});
}
} t[N<<2];
int n,q;
int h[N];
int st[N],ft[N];
int what[N];
void build(int v=1,int tl =0,int tr= N) {
if(tr-tl == 1) {
t[v].set(h[what[tl]]);
return;
}
int mid=(tl+tr)/2;
build(lc,tl,mid);
build(rc,mid,tr);
t[v].merge(t[lc],t[rc]);
//debug(tl,tr,t[v].diam,t[v].leftMax,t[v].rightMax);
}
void shift(int v) {
int x = t[v].lz;
t[lc].leftMax -= x;
t[lc].rightMax -= x;
t[lc].mxh += x;
t[lc].mnh += x;
t[lc].lz += x;
t[rc].leftMax -= x;
t[rc].rightMax -= x;
t[rc].mxh += x;
t[rc].mnh += x;
t[rc].lz += x;
t[v].lz = 0;
}
void upd(int l,int r,int x,int v=1,int tl=0,int tr =N) {
if(l > r) return;
if(l == tl && r == tr-1) {
t[v].leftMax -= x;
t[v].rightMax -= x;
t[v].mxh += x;
t[v].mnh += x;
t[v].lz += x;
return;
}
shift(v);
int mid=(tl + tr)/2;
upd(l,min(mid-1,r),x,lc,tl,mid);
upd(max(l,mid),r,x,rc,mid,tr);
t[v].merge(t[lc],t[rc]);
}
int W;
int w[N];
int ver[N];
vector<pll> G[N];
int timer;
void dfs(int v,int p =-1) {
what[timer] = v;
st[v] = timer ++;
for(auto [u,id] : G[v]) if(u != p) {
ver[id] = u;
h[u] = h[v] + w[id];
dfs(u,v);
what[timer] = v;
ft[v]= timer ++;
}
what[timer] = v;
ft[v]= timer ++;
}
int32_t main() {
cin.tie(nullptr)->sync_with_stdio(false);
cin>>n>>q>>W;
int last= 0;
for(int i = 0; i<n-1 ; i ++) {
int v,u; cin>>v>>u>>w[i];
G[v].pb({u,i});
G[u].pb({v,i});
}
dfs(1);
build();
debug(t[1].diam);
while(q--) {
int e,d; cin>>e>>d;
e= (e + last) % (n-1);
d= (d +last) % W;
int v= ver[e];
//debug(st[v],ft[v]);
upd(st[v],ft[v],-w[e]);
w[e] = d;
upd(st[v],ft[v],w[e]);
last = t[1].diam;
cout<<last << '\n';
}
return 0;
}
Compilation message
diameter.cpp: In function 'int32_t main()':
diameter.cpp:5:20: warning: statement has no effect [-Wunused-value]
5 | #define debug(...) 69
| ^~
diameter.cpp:135:2: note: in expansion of macro 'debug'
135 | debug(t[1].diam);
| ^~~~~
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
15 ms |
68184 KB |
Output is correct |
2 |
Correct |
11 ms |
68184 KB |
Output is correct |
3 |
Correct |
12 ms |
68188 KB |
Output is correct |
4 |
Correct |
12 ms |
68188 KB |
Output is correct |
5 |
Correct |
12 ms |
68336 KB |
Output is correct |
6 |
Correct |
11 ms |
68184 KB |
Output is correct |
7 |
Correct |
11 ms |
68332 KB |
Output is correct |
8 |
Correct |
11 ms |
68188 KB |
Output is correct |
9 |
Correct |
12 ms |
68188 KB |
Output is correct |
10 |
Correct |
11 ms |
68188 KB |
Output is correct |
11 |
Correct |
12 ms |
68188 KB |
Output is correct |
12 |
Correct |
12 ms |
68188 KB |
Output is correct |
13 |
Correct |
12 ms |
68188 KB |
Output is correct |
14 |
Correct |
12 ms |
68188 KB |
Output is correct |
15 |
Correct |
11 ms |
68188 KB |
Output is correct |
16 |
Correct |
11 ms |
68188 KB |
Output is correct |
17 |
Correct |
12 ms |
68188 KB |
Output is correct |
18 |
Correct |
11 ms |
68304 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
15 ms |
68184 KB |
Output is correct |
2 |
Correct |
11 ms |
68184 KB |
Output is correct |
3 |
Correct |
12 ms |
68188 KB |
Output is correct |
4 |
Correct |
12 ms |
68188 KB |
Output is correct |
5 |
Correct |
12 ms |
68336 KB |
Output is correct |
6 |
Correct |
11 ms |
68184 KB |
Output is correct |
7 |
Correct |
11 ms |
68332 KB |
Output is correct |
8 |
Correct |
11 ms |
68188 KB |
Output is correct |
9 |
Correct |
12 ms |
68188 KB |
Output is correct |
10 |
Correct |
11 ms |
68188 KB |
Output is correct |
11 |
Correct |
12 ms |
68188 KB |
Output is correct |
12 |
Correct |
12 ms |
68188 KB |
Output is correct |
13 |
Correct |
12 ms |
68188 KB |
Output is correct |
14 |
Correct |
12 ms |
68188 KB |
Output is correct |
15 |
Correct |
11 ms |
68188 KB |
Output is correct |
16 |
Correct |
11 ms |
68188 KB |
Output is correct |
17 |
Correct |
12 ms |
68188 KB |
Output is correct |
18 |
Correct |
11 ms |
68304 KB |
Output is correct |
19 |
Correct |
16 ms |
68444 KB |
Output is correct |
20 |
Correct |
17 ms |
68444 KB |
Output is correct |
21 |
Correct |
18 ms |
68444 KB |
Output is correct |
22 |
Correct |
17 ms |
68480 KB |
Output is correct |
23 |
Correct |
18 ms |
68444 KB |
Output is correct |
24 |
Correct |
18 ms |
68700 KB |
Output is correct |
25 |
Correct |
19 ms |
68700 KB |
Output is correct |
26 |
Correct |
19 ms |
68952 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
12 ms |
68188 KB |
Output is correct |
2 |
Correct |
12 ms |
68188 KB |
Output is correct |
3 |
Correct |
13 ms |
68368 KB |
Output is correct |
4 |
Correct |
26 ms |
68432 KB |
Output is correct |
5 |
Correct |
79 ms |
68564 KB |
Output is correct |
6 |
Correct |
12 ms |
68184 KB |
Output is correct |
7 |
Correct |
12 ms |
68392 KB |
Output is correct |
8 |
Correct |
12 ms |
68188 KB |
Output is correct |
9 |
Correct |
13 ms |
68188 KB |
Output is correct |
10 |
Correct |
26 ms |
68444 KB |
Output is correct |
11 |
Correct |
83 ms |
68836 KB |
Output is correct |
12 |
Correct |
13 ms |
68444 KB |
Output is correct |
13 |
Correct |
13 ms |
68440 KB |
Output is correct |
14 |
Correct |
16 ms |
68444 KB |
Output is correct |
15 |
Correct |
29 ms |
68700 KB |
Output is correct |
16 |
Correct |
90 ms |
68952 KB |
Output is correct |
17 |
Correct |
33 ms |
75716 KB |
Output is correct |
18 |
Correct |
41 ms |
75748 KB |
Output is correct |
19 |
Correct |
35 ms |
75724 KB |
Output is correct |
20 |
Correct |
53 ms |
75964 KB |
Output is correct |
21 |
Correct |
150 ms |
76632 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
12 ms |
68440 KB |
Output is correct |
2 |
Correct |
20 ms |
68440 KB |
Output is correct |
3 |
Correct |
55 ms |
68680 KB |
Output is correct |
4 |
Correct |
102 ms |
68748 KB |
Output is correct |
5 |
Correct |
15 ms |
68956 KB |
Output is correct |
6 |
Correct |
32 ms |
69516 KB |
Output is correct |
7 |
Correct |
63 ms |
69152 KB |
Output is correct |
8 |
Correct |
114 ms |
69460 KB |
Output is correct |
9 |
Correct |
26 ms |
73564 KB |
Output is correct |
10 |
Correct |
36 ms |
73552 KB |
Output is correct |
11 |
Correct |
91 ms |
74052 KB |
Output is correct |
12 |
Correct |
135 ms |
74064 KB |
Output is correct |
13 |
Correct |
41 ms |
76628 KB |
Output is correct |
14 |
Correct |
51 ms |
76628 KB |
Output is correct |
15 |
Correct |
99 ms |
76880 KB |
Output is correct |
16 |
Correct |
162 ms |
77064 KB |
Output is correct |
17 |
Correct |
139 ms |
77224 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
185 ms |
77908 KB |
Output is correct |
2 |
Correct |
194 ms |
77748 KB |
Output is correct |
3 |
Correct |
181 ms |
77908 KB |
Output is correct |
4 |
Correct |
180 ms |
77904 KB |
Output is correct |
5 |
Correct |
192 ms |
77640 KB |
Output is correct |
6 |
Correct |
162 ms |
77412 KB |
Output is correct |
7 |
Correct |
205 ms |
80364 KB |
Output is correct |
8 |
Correct |
205 ms |
80384 KB |
Output is correct |
9 |
Correct |
205 ms |
80208 KB |
Output is correct |
10 |
Correct |
211 ms |
80688 KB |
Output is correct |
11 |
Correct |
198 ms |
80080 KB |
Output is correct |
12 |
Correct |
207 ms |
79036 KB |
Output is correct |
13 |
Correct |
248 ms |
84188 KB |
Output is correct |
14 |
Correct |
238 ms |
84152 KB |
Output is correct |
15 |
Correct |
245 ms |
84128 KB |
Output is correct |
16 |
Correct |
242 ms |
84048 KB |
Output is correct |
17 |
Correct |
235 ms |
83404 KB |
Output is correct |
18 |
Correct |
218 ms |
80920 KB |
Output is correct |
19 |
Correct |
242 ms |
84056 KB |
Output is correct |
20 |
Correct |
245 ms |
84020 KB |
Output is correct |
21 |
Correct |
242 ms |
84048 KB |
Output is correct |
22 |
Correct |
241 ms |
83944 KB |
Output is correct |
23 |
Correct |
253 ms |
83616 KB |
Output is correct |
24 |
Correct |
219 ms |
80860 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
15 ms |
68184 KB |
Output is correct |
2 |
Correct |
11 ms |
68184 KB |
Output is correct |
3 |
Correct |
12 ms |
68188 KB |
Output is correct |
4 |
Correct |
12 ms |
68188 KB |
Output is correct |
5 |
Correct |
12 ms |
68336 KB |
Output is correct |
6 |
Correct |
11 ms |
68184 KB |
Output is correct |
7 |
Correct |
11 ms |
68332 KB |
Output is correct |
8 |
Correct |
11 ms |
68188 KB |
Output is correct |
9 |
Correct |
12 ms |
68188 KB |
Output is correct |
10 |
Correct |
11 ms |
68188 KB |
Output is correct |
11 |
Correct |
12 ms |
68188 KB |
Output is correct |
12 |
Correct |
12 ms |
68188 KB |
Output is correct |
13 |
Correct |
12 ms |
68188 KB |
Output is correct |
14 |
Correct |
12 ms |
68188 KB |
Output is correct |
15 |
Correct |
11 ms |
68188 KB |
Output is correct |
16 |
Correct |
11 ms |
68188 KB |
Output is correct |
17 |
Correct |
12 ms |
68188 KB |
Output is correct |
18 |
Correct |
11 ms |
68304 KB |
Output is correct |
19 |
Correct |
16 ms |
68444 KB |
Output is correct |
20 |
Correct |
17 ms |
68444 KB |
Output is correct |
21 |
Correct |
18 ms |
68444 KB |
Output is correct |
22 |
Correct |
17 ms |
68480 KB |
Output is correct |
23 |
Correct |
18 ms |
68444 KB |
Output is correct |
24 |
Correct |
18 ms |
68700 KB |
Output is correct |
25 |
Correct |
19 ms |
68700 KB |
Output is correct |
26 |
Correct |
19 ms |
68952 KB |
Output is correct |
27 |
Correct |
12 ms |
68188 KB |
Output is correct |
28 |
Correct |
12 ms |
68188 KB |
Output is correct |
29 |
Correct |
13 ms |
68368 KB |
Output is correct |
30 |
Correct |
26 ms |
68432 KB |
Output is correct |
31 |
Correct |
79 ms |
68564 KB |
Output is correct |
32 |
Correct |
12 ms |
68184 KB |
Output is correct |
33 |
Correct |
12 ms |
68392 KB |
Output is correct |
34 |
Correct |
12 ms |
68188 KB |
Output is correct |
35 |
Correct |
13 ms |
68188 KB |
Output is correct |
36 |
Correct |
26 ms |
68444 KB |
Output is correct |
37 |
Correct |
83 ms |
68836 KB |
Output is correct |
38 |
Correct |
13 ms |
68444 KB |
Output is correct |
39 |
Correct |
13 ms |
68440 KB |
Output is correct |
40 |
Correct |
16 ms |
68444 KB |
Output is correct |
41 |
Correct |
29 ms |
68700 KB |
Output is correct |
42 |
Correct |
90 ms |
68952 KB |
Output is correct |
43 |
Correct |
33 ms |
75716 KB |
Output is correct |
44 |
Correct |
41 ms |
75748 KB |
Output is correct |
45 |
Correct |
35 ms |
75724 KB |
Output is correct |
46 |
Correct |
53 ms |
75964 KB |
Output is correct |
47 |
Correct |
150 ms |
76632 KB |
Output is correct |
48 |
Correct |
12 ms |
68440 KB |
Output is correct |
49 |
Correct |
20 ms |
68440 KB |
Output is correct |
50 |
Correct |
55 ms |
68680 KB |
Output is correct |
51 |
Correct |
102 ms |
68748 KB |
Output is correct |
52 |
Correct |
15 ms |
68956 KB |
Output is correct |
53 |
Correct |
32 ms |
69516 KB |
Output is correct |
54 |
Correct |
63 ms |
69152 KB |
Output is correct |
55 |
Correct |
114 ms |
69460 KB |
Output is correct |
56 |
Correct |
26 ms |
73564 KB |
Output is correct |
57 |
Correct |
36 ms |
73552 KB |
Output is correct |
58 |
Correct |
91 ms |
74052 KB |
Output is correct |
59 |
Correct |
135 ms |
74064 KB |
Output is correct |
60 |
Correct |
41 ms |
76628 KB |
Output is correct |
61 |
Correct |
51 ms |
76628 KB |
Output is correct |
62 |
Correct |
99 ms |
76880 KB |
Output is correct |
63 |
Correct |
162 ms |
77064 KB |
Output is correct |
64 |
Correct |
139 ms |
77224 KB |
Output is correct |
65 |
Correct |
185 ms |
77908 KB |
Output is correct |
66 |
Correct |
194 ms |
77748 KB |
Output is correct |
67 |
Correct |
181 ms |
77908 KB |
Output is correct |
68 |
Correct |
180 ms |
77904 KB |
Output is correct |
69 |
Correct |
192 ms |
77640 KB |
Output is correct |
70 |
Correct |
162 ms |
77412 KB |
Output is correct |
71 |
Correct |
205 ms |
80364 KB |
Output is correct |
72 |
Correct |
205 ms |
80384 KB |
Output is correct |
73 |
Correct |
205 ms |
80208 KB |
Output is correct |
74 |
Correct |
211 ms |
80688 KB |
Output is correct |
75 |
Correct |
198 ms |
80080 KB |
Output is correct |
76 |
Correct |
207 ms |
79036 KB |
Output is correct |
77 |
Correct |
248 ms |
84188 KB |
Output is correct |
78 |
Correct |
238 ms |
84152 KB |
Output is correct |
79 |
Correct |
245 ms |
84128 KB |
Output is correct |
80 |
Correct |
242 ms |
84048 KB |
Output is correct |
81 |
Correct |
235 ms |
83404 KB |
Output is correct |
82 |
Correct |
218 ms |
80920 KB |
Output is correct |
83 |
Correct |
242 ms |
84056 KB |
Output is correct |
84 |
Correct |
245 ms |
84020 KB |
Output is correct |
85 |
Correct |
242 ms |
84048 KB |
Output is correct |
86 |
Correct |
241 ms |
83944 KB |
Output is correct |
87 |
Correct |
253 ms |
83616 KB |
Output is correct |
88 |
Correct |
219 ms |
80860 KB |
Output is correct |
89 |
Correct |
179 ms |
77648 KB |
Output is correct |
90 |
Correct |
189 ms |
78012 KB |
Output is correct |
91 |
Correct |
196 ms |
79444 KB |
Output is correct |
92 |
Correct |
198 ms |
79188 KB |
Output is correct |
93 |
Correct |
217 ms |
81748 KB |
Output is correct |
94 |
Correct |
215 ms |
80724 KB |
Output is correct |
95 |
Correct |
236 ms |
82004 KB |
Output is correct |
96 |
Correct |
233 ms |
81236 KB |
Output is correct |
97 |
Correct |
238 ms |
82004 KB |
Output is correct |
98 |
Correct |
242 ms |
84008 KB |
Output is correct |
99 |
Correct |
236 ms |
81776 KB |
Output is correct |
100 |
Correct |
252 ms |
81840 KB |
Output is correct |