bool home = 0;
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const ll INF = (ll) 1e18 + 7;
struct SegmentTree {
vector<ll> tree;
vector<ll> lazy;
int n;
void init(int nn) {
n = nn;
tree.resize(4 * (n + 7), 0);
lazy.resize(4 * (n + 7), 0);
}
void add(int v, int tl, int tr, int l, int r, ll x) {
if (lazy[v]) {
tree[v] += lazy[v];
if (tl < tr) {
lazy[2 * v] += lazy[v];
lazy[2 * v + 1] += lazy[v];
}
lazy[v] = 0;
}
if (tr < l || r < tl) {
return;
}
if (l <= tl && tr <= r) {
tree[v] += x;
if (tl < tr) {
lazy[2 * v] += x;
lazy[2 * v + 1] += x;
}
return;
}
int tm = (tl + tr) / 2;
add(2 * v, tl, tm, l, r, x);
add(2 * v + 1, tm + 1, tr, l, r, x);
tree[v] = max(tree[2 * v], tree[2 * v + 1]);
}
ll getmax(int v, int tl, int tr, int l, int r) {
if (lazy[v]) {
tree[v] += lazy[v];
if (tl < tr) {
lazy[2 * v] += lazy[v];
lazy[2 * v + 1] += lazy[v];
}
lazy[v] = 0;
}
if (tr < l || r < tl) {
return -INF;
}
if (l <= tl && tr <= r) {
return tree[v];
}
int tm = (tl + tr) / 2;
return max(getmax(2 * v, tl, tm, l, r), getmax(2 * v + 1, tm + 1, tr, l, r));
}
void add(int l, int r, ll x) {
add(1, 1, n, l, r, x);
}
ll getmax(int l, int r) {
return getmax(1, 1, n, l, r);;
}
};
const int N = (int) 1e5 + 7;
const int K = 20;
int n;
int q;
ll w;
int sum_edge[N];
ll val_edge[N];
vector<int> gindex[N];
SegmentTree trees[K];
bool blocked[N];
int sub[N];
int total_under;
void build_sub(int a, int p = -1) {
sub[a] = 1;
for (auto &I : gindex[a]) {
int b = sum_edge[I] - a;
if (b == p || blocked[b]) {
continue;
}
build_sub(b, a);
sub[a] += sub[b];
}
}
int fcen(int a, int p = -1) {
int mx = total_under - sub[a];
for (auto &I : gindex[a]) {
int b = sum_edge[I] - a;
if (b == p || blocked[b]) {
continue;
}
mx = max(mx, sub[b]);
}
if (mx <= total_under / 2) {
return a;
}
for (auto &I : gindex[a]) {
int b = sum_edge[I] - a;
if (b == p || blocked[b]) {
continue;
}
if (mx == sub[b]) {
return fcen(b, a);
}
}
}
int low[K][N];
int high[K][N];
int ord[K][N];
int where[K][N];
int vrt[K][N];
int top[K];
multiset<ll> s[N];
vector<ll> all;
vector<int> where2;
vector<pair<int, int>> seg;
int kek = -1;
multiset<int> tog;
void prep(int a, int p, int level) {
sub[a] = 1;
ord[level][++top[level]] = a;
low[level][a] = top[level];
for (auto &I : gindex[a]) {
int b = sum_edge[I] - a;
if (b == p || blocked[b]) {
continue;
}
where[level][I] = kek;
vrt[level][I] = b;
prep(b, a, level);
sub[a] += sub[b];
}
high[level][a] = top[level];
}
void add(int i, ll delta) {
for (int level = 0; level < K; level++) {
if (where[level][i] == -1) {
continue;
}
int b = vrt[level][i];
int l = low[level][b], r = high[level][b];
{
ll cur = 0;
if ((int) s[where2[where[level][i]]].size() == 0) {} else
if ((int) s[where2[where[level][i]]].size() == 1) {
cur = *s[where2[where[level][i]]].begin();
} else {
auto it = s[where2[where[level][i]]].end();
it--;
cur += *it;
it--;
cur += *it;
}
if (tog.count(cur)) {
tog.erase(tog.find(cur));
}
}
s[where2[where[level][i]]].erase(s[where2[where[level][i]]].find(trees[level].getmax(seg[where[level][i]].first, seg[where[level][i]].second)));
trees[level].add(l, r, delta);
all[where[level][i]] = trees[level].getmax(seg[where[level][i]].first, seg[where[level][i]].second);
s[where2[where[level][i]]].insert(trees[level].getmax(seg[where[level][i]].first, seg[where[level][i]].second));
{
ll cur = 0;
if ((int) s[where2[where[level][i]]].size() == 0) {} else
if ((int) s[where2[where[level][i]]].size() == 1) {
cur = *s[where2[where[level][i]]].begin();
} else {
auto it = s[where2[where[level][i]]].end();
it--;
cur += *it;
it--;
cur += *it;
}
tog.insert(cur);
}
}
}
void build_centroid(int a, int level) {
build_sub(a);
total_under = sub[a];
a = fcen(a);
blocked[a] = 1;
for (auto &I : gindex[a]) {
int b = sum_edge[I] - a;
if (blocked[b]) {
continue;
}
kek++;
all.push_back(0);
vrt[level][I] = b;
where[level][I] = kek;
prep(b, a, level);
seg.push_back({low[level][b], high[level][b]});
where2.push_back(a);
s[a].insert(0);
}
for (auto &I : gindex[a]) {
int b = sum_edge[I] - a;
if (blocked[b]) {
continue;
}
build_centroid(b, level + 1);
}
}
ll get_diam() {
ll sol = 0;
for (auto &s2 : s) {
auto it = s2.end();
ll cur = 0;
it--;
cur += *it;
it--;
cur += *it;
sol = max(sol, cur);
}
return sol;
}
int xx[N], yy[N];
int main() {
if (home == 0) {
ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
} else {
freopen ("input.txt", "r", stdin);
}
cin >> n >> q >> w;
for (int i = 0; i < K; i++) {
for (int j = 0; j < N; j++) {
where[i][j] = -1;
}
trees[i].init(n);
}
for (int i = 1; i < n; i++) {
int a, b, c;
cin >> a >> b >> c;
xx[i] = a;
yy[i] = b;
sum_edge[i] = a + b;
gindex[a].push_back(i);
gindex[b].push_back(i);
val_edge[i] = c;
}
build_centroid(1, 0);
for (int i = 1; i < n; i++) {
add(i, val_edge[i]);
}
ll last = 0;
for (int iq = 1; iq <= q; iq++) {
int d, e;
cin >> d >> e;
d = (d + last) % (n - 1) + 1;
e = (e + last) % w;
add(d, -val_edge[d] + e);
val_edge[d] = e;
if (tog.empty()) {
last = 0;
} else {
auto it = tog.end();
it--;
last = *it;
}
cout << last << "\n";
}
return 0;
}
Compilation message
diameter.cpp: In function 'int fcen(int, int)':
diameter.cpp:121:1: warning: control reaches end of non-void function [-Wreturn-type]
121 | }
| ^
diameter.cpp: In function 'int main()':
diameter.cpp:253:13: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
253 | freopen ("input.txt", "r", stdin);
| ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
8 ms |
15316 KB |
Output is correct |
2 |
Correct |
8 ms |
15316 KB |
Output is correct |
3 |
Correct |
8 ms |
15316 KB |
Output is correct |
4 |
Correct |
8 ms |
15188 KB |
Output is correct |
5 |
Correct |
8 ms |
15228 KB |
Output is correct |
6 |
Correct |
8 ms |
15300 KB |
Output is correct |
7 |
Correct |
8 ms |
15316 KB |
Output is correct |
8 |
Correct |
9 ms |
15316 KB |
Output is correct |
9 |
Correct |
8 ms |
15316 KB |
Output is correct |
10 |
Correct |
8 ms |
15316 KB |
Output is correct |
11 |
Correct |
8 ms |
15316 KB |
Output is correct |
12 |
Correct |
8 ms |
15316 KB |
Output is correct |
13 |
Correct |
8 ms |
15444 KB |
Output is correct |
14 |
Correct |
8 ms |
15480 KB |
Output is correct |
15 |
Correct |
8 ms |
15372 KB |
Output is correct |
16 |
Correct |
9 ms |
15444 KB |
Output is correct |
17 |
Correct |
9 ms |
15444 KB |
Output is correct |
18 |
Correct |
8 ms |
15488 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
8 ms |
15316 KB |
Output is correct |
2 |
Correct |
8 ms |
15316 KB |
Output is correct |
3 |
Correct |
8 ms |
15316 KB |
Output is correct |
4 |
Correct |
8 ms |
15188 KB |
Output is correct |
5 |
Correct |
8 ms |
15228 KB |
Output is correct |
6 |
Correct |
8 ms |
15300 KB |
Output is correct |
7 |
Correct |
8 ms |
15316 KB |
Output is correct |
8 |
Correct |
9 ms |
15316 KB |
Output is correct |
9 |
Correct |
8 ms |
15316 KB |
Output is correct |
10 |
Correct |
8 ms |
15316 KB |
Output is correct |
11 |
Correct |
8 ms |
15316 KB |
Output is correct |
12 |
Correct |
8 ms |
15316 KB |
Output is correct |
13 |
Correct |
8 ms |
15444 KB |
Output is correct |
14 |
Correct |
8 ms |
15480 KB |
Output is correct |
15 |
Correct |
8 ms |
15372 KB |
Output is correct |
16 |
Correct |
9 ms |
15444 KB |
Output is correct |
17 |
Correct |
9 ms |
15444 KB |
Output is correct |
18 |
Correct |
8 ms |
15488 KB |
Output is correct |
19 |
Correct |
37 ms |
16972 KB |
Output is correct |
20 |
Correct |
40 ms |
16928 KB |
Output is correct |
21 |
Correct |
45 ms |
17028 KB |
Output is correct |
22 |
Correct |
52 ms |
17008 KB |
Output is correct |
23 |
Correct |
88 ms |
23180 KB |
Output is correct |
24 |
Correct |
108 ms |
23328 KB |
Output is correct |
25 |
Correct |
127 ms |
23496 KB |
Output is correct |
26 |
Correct |
137 ms |
23956 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
8 ms |
15232 KB |
Output is correct |
2 |
Correct |
10 ms |
15188 KB |
Output is correct |
3 |
Correct |
9 ms |
15268 KB |
Output is correct |
4 |
Correct |
20 ms |
15324 KB |
Output is correct |
5 |
Correct |
72 ms |
15712 KB |
Output is correct |
6 |
Correct |
8 ms |
15168 KB |
Output is correct |
7 |
Correct |
10 ms |
15928 KB |
Output is correct |
8 |
Correct |
8 ms |
15956 KB |
Output is correct |
9 |
Correct |
10 ms |
15956 KB |
Output is correct |
10 |
Correct |
28 ms |
16052 KB |
Output is correct |
11 |
Correct |
103 ms |
16364 KB |
Output is correct |
12 |
Correct |
16 ms |
22356 KB |
Output is correct |
13 |
Correct |
17 ms |
22356 KB |
Output is correct |
14 |
Correct |
19 ms |
22356 KB |
Output is correct |
15 |
Correct |
41 ms |
22440 KB |
Output is correct |
16 |
Correct |
143 ms |
22900 KB |
Output is correct |
17 |
Correct |
220 ms |
154896 KB |
Output is correct |
18 |
Correct |
226 ms |
154812 KB |
Output is correct |
19 |
Correct |
222 ms |
154732 KB |
Output is correct |
20 |
Correct |
262 ms |
154844 KB |
Output is correct |
21 |
Correct |
515 ms |
155324 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
18 ms |
16852 KB |
Output is correct |
2 |
Correct |
58 ms |
16924 KB |
Output is correct |
3 |
Correct |
228 ms |
17172 KB |
Output is correct |
4 |
Correct |
447 ms |
17372 KB |
Output is correct |
5 |
Correct |
126 ms |
31308 KB |
Output is correct |
6 |
Correct |
209 ms |
31380 KB |
Output is correct |
7 |
Correct |
530 ms |
31616 KB |
Output is correct |
8 |
Correct |
942 ms |
31980 KB |
Output is correct |
9 |
Correct |
782 ms |
95436 KB |
Output is correct |
10 |
Correct |
896 ms |
95540 KB |
Output is correct |
11 |
Correct |
1424 ms |
95852 KB |
Output is correct |
12 |
Correct |
2121 ms |
96096 KB |
Output is correct |
13 |
Correct |
1816 ms |
176960 KB |
Output is correct |
14 |
Correct |
1868 ms |
176992 KB |
Output is correct |
15 |
Correct |
2510 ms |
177328 KB |
Output is correct |
16 |
Correct |
3354 ms |
177516 KB |
Output is correct |
17 |
Execution timed out |
5064 ms |
177508 KB |
Time limit exceeded |
18 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Execution timed out |
5063 ms |
144008 KB |
Time limit exceeded |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
8 ms |
15316 KB |
Output is correct |
2 |
Correct |
8 ms |
15316 KB |
Output is correct |
3 |
Correct |
8 ms |
15316 KB |
Output is correct |
4 |
Correct |
8 ms |
15188 KB |
Output is correct |
5 |
Correct |
8 ms |
15228 KB |
Output is correct |
6 |
Correct |
8 ms |
15300 KB |
Output is correct |
7 |
Correct |
8 ms |
15316 KB |
Output is correct |
8 |
Correct |
9 ms |
15316 KB |
Output is correct |
9 |
Correct |
8 ms |
15316 KB |
Output is correct |
10 |
Correct |
8 ms |
15316 KB |
Output is correct |
11 |
Correct |
8 ms |
15316 KB |
Output is correct |
12 |
Correct |
8 ms |
15316 KB |
Output is correct |
13 |
Correct |
8 ms |
15444 KB |
Output is correct |
14 |
Correct |
8 ms |
15480 KB |
Output is correct |
15 |
Correct |
8 ms |
15372 KB |
Output is correct |
16 |
Correct |
9 ms |
15444 KB |
Output is correct |
17 |
Correct |
9 ms |
15444 KB |
Output is correct |
18 |
Correct |
8 ms |
15488 KB |
Output is correct |
19 |
Correct |
37 ms |
16972 KB |
Output is correct |
20 |
Correct |
40 ms |
16928 KB |
Output is correct |
21 |
Correct |
45 ms |
17028 KB |
Output is correct |
22 |
Correct |
52 ms |
17008 KB |
Output is correct |
23 |
Correct |
88 ms |
23180 KB |
Output is correct |
24 |
Correct |
108 ms |
23328 KB |
Output is correct |
25 |
Correct |
127 ms |
23496 KB |
Output is correct |
26 |
Correct |
137 ms |
23956 KB |
Output is correct |
27 |
Correct |
8 ms |
15232 KB |
Output is correct |
28 |
Correct |
10 ms |
15188 KB |
Output is correct |
29 |
Correct |
9 ms |
15268 KB |
Output is correct |
30 |
Correct |
20 ms |
15324 KB |
Output is correct |
31 |
Correct |
72 ms |
15712 KB |
Output is correct |
32 |
Correct |
8 ms |
15168 KB |
Output is correct |
33 |
Correct |
10 ms |
15928 KB |
Output is correct |
34 |
Correct |
8 ms |
15956 KB |
Output is correct |
35 |
Correct |
10 ms |
15956 KB |
Output is correct |
36 |
Correct |
28 ms |
16052 KB |
Output is correct |
37 |
Correct |
103 ms |
16364 KB |
Output is correct |
38 |
Correct |
16 ms |
22356 KB |
Output is correct |
39 |
Correct |
17 ms |
22356 KB |
Output is correct |
40 |
Correct |
19 ms |
22356 KB |
Output is correct |
41 |
Correct |
41 ms |
22440 KB |
Output is correct |
42 |
Correct |
143 ms |
22900 KB |
Output is correct |
43 |
Correct |
220 ms |
154896 KB |
Output is correct |
44 |
Correct |
226 ms |
154812 KB |
Output is correct |
45 |
Correct |
222 ms |
154732 KB |
Output is correct |
46 |
Correct |
262 ms |
154844 KB |
Output is correct |
47 |
Correct |
515 ms |
155324 KB |
Output is correct |
48 |
Correct |
18 ms |
16852 KB |
Output is correct |
49 |
Correct |
58 ms |
16924 KB |
Output is correct |
50 |
Correct |
228 ms |
17172 KB |
Output is correct |
51 |
Correct |
447 ms |
17372 KB |
Output is correct |
52 |
Correct |
126 ms |
31308 KB |
Output is correct |
53 |
Correct |
209 ms |
31380 KB |
Output is correct |
54 |
Correct |
530 ms |
31616 KB |
Output is correct |
55 |
Correct |
942 ms |
31980 KB |
Output is correct |
56 |
Correct |
782 ms |
95436 KB |
Output is correct |
57 |
Correct |
896 ms |
95540 KB |
Output is correct |
58 |
Correct |
1424 ms |
95852 KB |
Output is correct |
59 |
Correct |
2121 ms |
96096 KB |
Output is correct |
60 |
Correct |
1816 ms |
176960 KB |
Output is correct |
61 |
Correct |
1868 ms |
176992 KB |
Output is correct |
62 |
Correct |
2510 ms |
177328 KB |
Output is correct |
63 |
Correct |
3354 ms |
177516 KB |
Output is correct |
64 |
Execution timed out |
5064 ms |
177508 KB |
Time limit exceeded |
65 |
Halted |
0 ms |
0 KB |
- |