#include <bits/stdc++.h>
#define ll long long
#define pii pair<int, int>
#define F first
#define S second
using namespace std;
int N, Q, in[100005], out[100005], child[100005], t, pre[100005];
ll w, lazy[800005], edge[100005];
vector<pii> E[100005];
struct node
{
ll a, b, c, ab, bc, abc;
} seg[800005];
node merge(node L, node R)
{
return node{max(L.a, R.a),
max(L.b, R.b),
max(L.c, R.c),
max({L.ab, R.ab, L.a + R.b}),
max({L.bc, R.bc, L.b + R.c}),
max({L.abc, R.abc, L.ab + R.c, L.a + R.bc})};
}
void apply(int i, ll tag)
{
lazy[i] += tag;
seg[i] = node{seg[i].a + tag, seg[i].b - 2 * tag, seg[i].c + tag, seg[i].ab - tag, seg[i].bc - tag, seg[i].abc};
}
void modify(int mL, int mR, ll val, int i = 1, int L = 1, int R = 2 * N)
{
if (mL <= L && R <= mR)
apply(i, val);
else if (R < mL || mR < L)
return;
else
{
int mid = (L + R) / 2;
apply(i << 1, lazy[i]);
apply(i << 1 | 1, lazy[i]);
lazy[i] = 0;
modify(mL, mR, val, i << 1, L, mid);
modify(mL, mR, val, i << 1 | 1, mid + 1, R);
seg[i] = merge(seg[i << 1], seg[i << 1 | 1]);
}
}
void dfs(int u)
{
in[u] = ++t;
out[u] = t;
for (auto [v, i] : E[u])
if (pre[u] != v)
{
pre[v] = u;
child[i] = v;
dfs(v);
out[u] = ++t;
}
}
signed main()
{
cin >> N >> Q >> w;
for (int i = 1; i < N; i++)
{
int u, v;
cin >> u >> v >> edge[i];
E[u].emplace_back(pii(v, i));
E[v].emplace_back(pii(u, i));
}
dfs(1);
for (int i = 1; i < N; i++)
modify(in[child[i]], out[child[i]], edge[i]);
ll last = 0;
for (int i = 1; i <= Q; i++)
{
ll d, e;
cin >> d >> e;
d = (d + last) % (N - 1) + 1;
e = (e + last) % w;
modify(in[child[d]], out[child[d]], e - edge[d]);
edge[d] = e;
cout << (last = seg[1].abc) << '\n';
}
}
Compilation message
diameter.cpp: In function 'void dfs(int)':
diameter.cpp:55:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
55 | for (auto [v, i] : E[u])
| ^
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
2 ms |
2644 KB |
Output is correct |
2 |
Correct |
2 ms |
2644 KB |
Output is correct |
3 |
Correct |
2 ms |
2772 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 |
2660 KB |
Output is correct |
7 |
Correct |
2 ms |
2664 KB |
Output is correct |
8 |
Correct |
2 ms |
2644 KB |
Output is correct |
9 |
Correct |
2 ms |
2660 KB |
Output is correct |
10 |
Correct |
2 ms |
2644 KB |
Output is correct |
11 |
Correct |
2 ms |
2660 KB |
Output is correct |
12 |
Correct |
2 ms |
2644 KB |
Output is correct |
13 |
Correct |
3 ms |
2644 KB |
Output is correct |
14 |
Correct |
2 ms |
2660 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 |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
2 ms |
2644 KB |
Output is correct |
2 |
Correct |
2 ms |
2644 KB |
Output is correct |
3 |
Correct |
2 ms |
2772 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 |
2660 KB |
Output is correct |
7 |
Correct |
2 ms |
2664 KB |
Output is correct |
8 |
Correct |
2 ms |
2644 KB |
Output is correct |
9 |
Correct |
2 ms |
2660 KB |
Output is correct |
10 |
Correct |
2 ms |
2644 KB |
Output is correct |
11 |
Correct |
2 ms |
2660 KB |
Output is correct |
12 |
Correct |
2 ms |
2644 KB |
Output is correct |
13 |
Correct |
3 ms |
2644 KB |
Output is correct |
14 |
Correct |
2 ms |
2660 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 |
19 ms |
3028 KB |
Output is correct |
20 |
Correct |
14 ms |
3052 KB |
Output is correct |
21 |
Correct |
14 ms |
3076 KB |
Output is correct |
22 |
Correct |
16 ms |
3024 KB |
Output is correct |
23 |
Correct |
20 ms |
4872 KB |
Output is correct |
24 |
Correct |
20 ms |
4936 KB |
Output is correct |
25 |
Correct |
20 ms |
4960 KB |
Output is correct |
26 |
Correct |
23 ms |
5204 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
2 ms |
2660 KB |
Output is correct |
2 |
Correct |
2 ms |
2644 KB |
Output is correct |
3 |
Correct |
7 ms |
2680 KB |
Output is correct |
4 |
Correct |
37 ms |
2832 KB |
Output is correct |
5 |
Correct |
176 ms |
3804 KB |
Output is correct |
6 |
Correct |
2 ms |
2644 KB |
Output is correct |
7 |
Correct |
2 ms |
2772 KB |
Output is correct |
8 |
Correct |
2 ms |
2800 KB |
Output is correct |
9 |
Correct |
6 ms |
2804 KB |
Output is correct |
10 |
Correct |
45 ms |
3044 KB |
Output is correct |
11 |
Correct |
212 ms |
4128 KB |
Output is correct |
12 |
Correct |
8 ms |
4820 KB |
Output is correct |
13 |
Correct |
8 ms |
4848 KB |
Output is correct |
14 |
Correct |
12 ms |
4900 KB |
Output is correct |
15 |
Correct |
50 ms |
5060 KB |
Output is correct |
16 |
Correct |
219 ms |
6300 KB |
Output is correct |
17 |
Correct |
133 ms |
38816 KB |
Output is correct |
18 |
Correct |
129 ms |
38784 KB |
Output is correct |
19 |
Correct |
132 ms |
38892 KB |
Output is correct |
20 |
Correct |
192 ms |
39248 KB |
Output is correct |
21 |
Correct |
407 ms |
40592 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
5 ms |
2900 KB |
Output is correct |
2 |
Correct |
24 ms |
3136 KB |
Output is correct |
3 |
Correct |
110 ms |
3664 KB |
Output is correct |
4 |
Correct |
225 ms |
4304 KB |
Output is correct |
5 |
Correct |
23 ms |
7064 KB |
Output is correct |
6 |
Correct |
39 ms |
7152 KB |
Output is correct |
7 |
Correct |
130 ms |
7768 KB |
Output is correct |
8 |
Correct |
253 ms |
8556 KB |
Output is correct |
9 |
Correct |
98 ms |
20944 KB |
Output is correct |
10 |
Correct |
103 ms |
21076 KB |
Output is correct |
11 |
Correct |
208 ms |
21764 KB |
Output is correct |
12 |
Correct |
349 ms |
22604 KB |
Output is correct |
13 |
Correct |
159 ms |
39208 KB |
Output is correct |
14 |
Correct |
189 ms |
39312 KB |
Output is correct |
15 |
Correct |
299 ms |
40056 KB |
Output is correct |
16 |
Correct |
440 ms |
40820 KB |
Output is correct |
17 |
Correct |
406 ms |
40612 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
542 ms |
43112 KB |
Output is correct |
2 |
Correct |
544 ms |
43104 KB |
Output is correct |
3 |
Correct |
546 ms |
43048 KB |
Output is correct |
4 |
Correct |
558 ms |
43124 KB |
Output is correct |
5 |
Correct |
532 ms |
43084 KB |
Output is correct |
6 |
Correct |
506 ms |
43232 KB |
Output is correct |
7 |
Correct |
579 ms |
45232 KB |
Output is correct |
8 |
Correct |
578 ms |
45308 KB |
Output is correct |
9 |
Correct |
570 ms |
45184 KB |
Output is correct |
10 |
Correct |
555 ms |
45356 KB |
Output is correct |
11 |
Correct |
576 ms |
45136 KB |
Output is correct |
12 |
Correct |
524 ms |
44944 KB |
Output is correct |
13 |
Correct |
709 ms |
48688 KB |
Output is correct |
14 |
Correct |
654 ms |
48640 KB |
Output is correct |
15 |
Correct |
712 ms |
48684 KB |
Output is correct |
16 |
Correct |
691 ms |
48592 KB |
Output is correct |
17 |
Correct |
729 ms |
48120 KB |
Output is correct |
18 |
Correct |
586 ms |
46164 KB |
Output is correct |
19 |
Correct |
659 ms |
48652 KB |
Output is correct |
20 |
Correct |
657 ms |
48676 KB |
Output is correct |
21 |
Correct |
665 ms |
48640 KB |
Output is correct |
22 |
Correct |
738 ms |
48688 KB |
Output is correct |
23 |
Correct |
669 ms |
48116 KB |
Output is correct |
24 |
Correct |
650 ms |
46020 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
2 ms |
2644 KB |
Output is correct |
2 |
Correct |
2 ms |
2644 KB |
Output is correct |
3 |
Correct |
2 ms |
2772 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 |
2660 KB |
Output is correct |
7 |
Correct |
2 ms |
2664 KB |
Output is correct |
8 |
Correct |
2 ms |
2644 KB |
Output is correct |
9 |
Correct |
2 ms |
2660 KB |
Output is correct |
10 |
Correct |
2 ms |
2644 KB |
Output is correct |
11 |
Correct |
2 ms |
2660 KB |
Output is correct |
12 |
Correct |
2 ms |
2644 KB |
Output is correct |
13 |
Correct |
3 ms |
2644 KB |
Output is correct |
14 |
Correct |
2 ms |
2660 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 |
19 ms |
3028 KB |
Output is correct |
20 |
Correct |
14 ms |
3052 KB |
Output is correct |
21 |
Correct |
14 ms |
3076 KB |
Output is correct |
22 |
Correct |
16 ms |
3024 KB |
Output is correct |
23 |
Correct |
20 ms |
4872 KB |
Output is correct |
24 |
Correct |
20 ms |
4936 KB |
Output is correct |
25 |
Correct |
20 ms |
4960 KB |
Output is correct |
26 |
Correct |
23 ms |
5204 KB |
Output is correct |
27 |
Correct |
2 ms |
2660 KB |
Output is correct |
28 |
Correct |
2 ms |
2644 KB |
Output is correct |
29 |
Correct |
7 ms |
2680 KB |
Output is correct |
30 |
Correct |
37 ms |
2832 KB |
Output is correct |
31 |
Correct |
176 ms |
3804 KB |
Output is correct |
32 |
Correct |
2 ms |
2644 KB |
Output is correct |
33 |
Correct |
2 ms |
2772 KB |
Output is correct |
34 |
Correct |
2 ms |
2800 KB |
Output is correct |
35 |
Correct |
6 ms |
2804 KB |
Output is correct |
36 |
Correct |
45 ms |
3044 KB |
Output is correct |
37 |
Correct |
212 ms |
4128 KB |
Output is correct |
38 |
Correct |
8 ms |
4820 KB |
Output is correct |
39 |
Correct |
8 ms |
4848 KB |
Output is correct |
40 |
Correct |
12 ms |
4900 KB |
Output is correct |
41 |
Correct |
50 ms |
5060 KB |
Output is correct |
42 |
Correct |
219 ms |
6300 KB |
Output is correct |
43 |
Correct |
133 ms |
38816 KB |
Output is correct |
44 |
Correct |
129 ms |
38784 KB |
Output is correct |
45 |
Correct |
132 ms |
38892 KB |
Output is correct |
46 |
Correct |
192 ms |
39248 KB |
Output is correct |
47 |
Correct |
407 ms |
40592 KB |
Output is correct |
48 |
Correct |
5 ms |
2900 KB |
Output is correct |
49 |
Correct |
24 ms |
3136 KB |
Output is correct |
50 |
Correct |
110 ms |
3664 KB |
Output is correct |
51 |
Correct |
225 ms |
4304 KB |
Output is correct |
52 |
Correct |
23 ms |
7064 KB |
Output is correct |
53 |
Correct |
39 ms |
7152 KB |
Output is correct |
54 |
Correct |
130 ms |
7768 KB |
Output is correct |
55 |
Correct |
253 ms |
8556 KB |
Output is correct |
56 |
Correct |
98 ms |
20944 KB |
Output is correct |
57 |
Correct |
103 ms |
21076 KB |
Output is correct |
58 |
Correct |
208 ms |
21764 KB |
Output is correct |
59 |
Correct |
349 ms |
22604 KB |
Output is correct |
60 |
Correct |
159 ms |
39208 KB |
Output is correct |
61 |
Correct |
189 ms |
39312 KB |
Output is correct |
62 |
Correct |
299 ms |
40056 KB |
Output is correct |
63 |
Correct |
440 ms |
40820 KB |
Output is correct |
64 |
Correct |
406 ms |
40612 KB |
Output is correct |
65 |
Correct |
542 ms |
43112 KB |
Output is correct |
66 |
Correct |
544 ms |
43104 KB |
Output is correct |
67 |
Correct |
546 ms |
43048 KB |
Output is correct |
68 |
Correct |
558 ms |
43124 KB |
Output is correct |
69 |
Correct |
532 ms |
43084 KB |
Output is correct |
70 |
Correct |
506 ms |
43232 KB |
Output is correct |
71 |
Correct |
579 ms |
45232 KB |
Output is correct |
72 |
Correct |
578 ms |
45308 KB |
Output is correct |
73 |
Correct |
570 ms |
45184 KB |
Output is correct |
74 |
Correct |
555 ms |
45356 KB |
Output is correct |
75 |
Correct |
576 ms |
45136 KB |
Output is correct |
76 |
Correct |
524 ms |
44944 KB |
Output is correct |
77 |
Correct |
709 ms |
48688 KB |
Output is correct |
78 |
Correct |
654 ms |
48640 KB |
Output is correct |
79 |
Correct |
712 ms |
48684 KB |
Output is correct |
80 |
Correct |
691 ms |
48592 KB |
Output is correct |
81 |
Correct |
729 ms |
48120 KB |
Output is correct |
82 |
Correct |
586 ms |
46164 KB |
Output is correct |
83 |
Correct |
659 ms |
48652 KB |
Output is correct |
84 |
Correct |
657 ms |
48676 KB |
Output is correct |
85 |
Correct |
665 ms |
48640 KB |
Output is correct |
86 |
Correct |
738 ms |
48688 KB |
Output is correct |
87 |
Correct |
669 ms |
48116 KB |
Output is correct |
88 |
Correct |
650 ms |
46020 KB |
Output is correct |
89 |
Correct |
507 ms |
41996 KB |
Output is correct |
90 |
Correct |
504 ms |
42444 KB |
Output is correct |
91 |
Correct |
577 ms |
43636 KB |
Output is correct |
92 |
Correct |
532 ms |
43428 KB |
Output is correct |
93 |
Correct |
549 ms |
45560 KB |
Output is correct |
94 |
Correct |
607 ms |
44836 KB |
Output is correct |
95 |
Correct |
672 ms |
45996 KB |
Output is correct |
96 |
Correct |
617 ms |
45164 KB |
Output is correct |
97 |
Correct |
606 ms |
46092 KB |
Output is correct |
98 |
Correct |
659 ms |
47964 KB |
Output is correct |
99 |
Correct |
693 ms |
45720 KB |
Output is correct |
100 |
Correct |
641 ms |
45796 KB |
Output is correct |