/* Author : Mychecksdead */
#include<bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
typedef long long int ll;
typedef long double ld;
#define MOD1 (1000000000+7)
#define MOD (998244353)
#define PI 3.1415926535
#define pb push_back
#define setp() cout << setprecision(15)
#define all(x) x.begin(), x.end()
#define debug(x) cerr << #x << " is " << x << '\n';
const int N = 1e6+100, M = 1e5+10, F = 2147483646, K = 20;
int n, q;
bool case3 = 1, case4 = 1;
pair<int, ll> par[N];
ll w, dp[N], dps[N][2];
vector<int> g[N];
vector<pair<int, ll>> edges(N);
multiset<ll> s, answers;
ll dfs(int v, int p){
pair<ll, ll> best = {0, 0};
dp[v] = 0;
ll d = 0;
for(int E: g[v]){
auto e = edges[E];
int u = e.first;
if(u == p) continue;
d = max(d, dfs(u, v));
par[u] = {v, e.second};
dp[v] = max(dp[v], dp[u] + e.second);
if(best.first < dp[u] + e.second){
swap(best.first, best.second);
best.first = dp[u] + e.second;
}else if(best.second < dp[u] + e.second){
best.second = dp[u] + e.second;
}
if(case4)
dps[v][u % 2] = dp[u] + e.second;
}
if(case4)
answers.insert(dps[v][0] + dps[v][1]);
return max(d, best.first + best.second);
}
void solve(){
cin >> n >> q >> w;
for(int i = 0; i < n - 1; ++i){
int u, v; ll x; cin >> u >> v >> x;
g[u].pb(2*i);
g[v].pb(2*i+1);
if(u != 1 && v != 1) case3 = 0;
if(v/2 != u && u/2 != v) case4 = 0;
s.insert(x);
edges[i*2] = {v, x};
edges[i*2+1] = {u, x};
}
for(int i = 0; i <= n; ++i) dps[i][0] = dps[i][1] = 0;
if(case4) dfs(1, 0);
ll last = 0;
for(;q--;){
ll d, x; cin >> d >> x;
d = (d + last) % (n-1);
x = (x + last) % w;
ll old_x = edges[2*d].second;
edges[2*d].second = edges[2*d+1].second = x;
if(case3){
s.erase(s.find(old_x));
s.insert(x);
auto it = s.end(); --it;
if(s.size()==1) last = *it;
else{
last = *it;
it--;
last += *it;
}
}else if(case4){
int v = edges[2*d].first;
if(par[v].first != edges[2*d+1].first) v = edges[2*d].first;
par[v].second = x;
while(v > 1){
int u = v;
v = par[v].first;
answers.erase(answers.find(dps[v][0] + dps[v][1]));
dps[v][u % 2] = par[u].second + max(dps[u][0], dps[u][1]);
answers.insert(dps[v][0] + dps[v][1]);
}
auto it = answers.end(); --it;
last = *it;
}else{
// answers.clear();
last = dfs(1, 0);
// last = *(--answers.end());
}
cout << last << '\n';
}
}
int main(){
cin.tie(0); ios::sync_with_stdio(0);
int T = 1, aa;
// cin >> T;aa=T;
while(T--){
// cout << "Case #" << aa-T << ": ";
solve();
cout << '\n';
}
return 0;
}
Compilation message
diameter.cpp: In function 'int main()':
diameter.cpp:128:16: warning: unused variable 'aa' [-Wunused-variable]
128 | int T = 1, aa;
| ^~
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
18 ms |
39380 KB |
Output is correct |
2 |
Correct |
18 ms |
39380 KB |
Output is correct |
3 |
Correct |
19 ms |
39384 KB |
Output is correct |
4 |
Correct |
18 ms |
39380 KB |
Output is correct |
5 |
Correct |
19 ms |
39508 KB |
Output is correct |
6 |
Correct |
19 ms |
39380 KB |
Output is correct |
7 |
Correct |
19 ms |
39452 KB |
Output is correct |
8 |
Correct |
18 ms |
39444 KB |
Output is correct |
9 |
Correct |
21 ms |
39392 KB |
Output is correct |
10 |
Correct |
21 ms |
39460 KB |
Output is correct |
11 |
Correct |
18 ms |
39380 KB |
Output is correct |
12 |
Correct |
18 ms |
39380 KB |
Output is correct |
13 |
Correct |
18 ms |
39492 KB |
Output is correct |
14 |
Correct |
19 ms |
39484 KB |
Output is correct |
15 |
Correct |
18 ms |
39412 KB |
Output is correct |
16 |
Correct |
19 ms |
39392 KB |
Output is correct |
17 |
Correct |
18 ms |
39508 KB |
Output is correct |
18 |
Correct |
19 ms |
39508 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
18 ms |
39380 KB |
Output is correct |
2 |
Correct |
18 ms |
39380 KB |
Output is correct |
3 |
Correct |
19 ms |
39384 KB |
Output is correct |
4 |
Correct |
18 ms |
39380 KB |
Output is correct |
5 |
Correct |
19 ms |
39508 KB |
Output is correct |
6 |
Correct |
19 ms |
39380 KB |
Output is correct |
7 |
Correct |
19 ms |
39452 KB |
Output is correct |
8 |
Correct |
18 ms |
39444 KB |
Output is correct |
9 |
Correct |
21 ms |
39392 KB |
Output is correct |
10 |
Correct |
21 ms |
39460 KB |
Output is correct |
11 |
Correct |
18 ms |
39380 KB |
Output is correct |
12 |
Correct |
18 ms |
39380 KB |
Output is correct |
13 |
Correct |
18 ms |
39492 KB |
Output is correct |
14 |
Correct |
19 ms |
39484 KB |
Output is correct |
15 |
Correct |
18 ms |
39412 KB |
Output is correct |
16 |
Correct |
19 ms |
39392 KB |
Output is correct |
17 |
Correct |
18 ms |
39508 KB |
Output is correct |
18 |
Correct |
19 ms |
39508 KB |
Output is correct |
19 |
Correct |
131 ms |
39616 KB |
Output is correct |
20 |
Correct |
140 ms |
39628 KB |
Output is correct |
21 |
Correct |
145 ms |
39636 KB |
Output is correct |
22 |
Correct |
164 ms |
39688 KB |
Output is correct |
23 |
Correct |
953 ms |
40092 KB |
Output is correct |
24 |
Correct |
982 ms |
40124 KB |
Output is correct |
25 |
Correct |
1073 ms |
40416 KB |
Output is correct |
26 |
Correct |
1219 ms |
40856 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
16 ms |
39436 KB |
Output is correct |
2 |
Correct |
22 ms |
39380 KB |
Output is correct |
3 |
Correct |
21 ms |
39508 KB |
Output is correct |
4 |
Correct |
26 ms |
39572 KB |
Output is correct |
5 |
Correct |
51 ms |
39816 KB |
Output is correct |
6 |
Correct |
24 ms |
39404 KB |
Output is correct |
7 |
Correct |
18 ms |
39508 KB |
Output is correct |
8 |
Correct |
21 ms |
39448 KB |
Output is correct |
9 |
Correct |
19 ms |
39460 KB |
Output is correct |
10 |
Correct |
26 ms |
39636 KB |
Output is correct |
11 |
Correct |
58 ms |
39896 KB |
Output is correct |
12 |
Correct |
20 ms |
39892 KB |
Output is correct |
13 |
Correct |
21 ms |
39892 KB |
Output is correct |
14 |
Correct |
23 ms |
39880 KB |
Output is correct |
15 |
Correct |
29 ms |
40020 KB |
Output is correct |
16 |
Correct |
68 ms |
40488 KB |
Output is correct |
17 |
Correct |
80 ms |
49220 KB |
Output is correct |
18 |
Correct |
85 ms |
49248 KB |
Output is correct |
19 |
Correct |
77 ms |
49268 KB |
Output is correct |
20 |
Correct |
100 ms |
49388 KB |
Output is correct |
21 |
Correct |
187 ms |
49824 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
20 ms |
39636 KB |
Output is correct |
2 |
Correct |
28 ms |
39780 KB |
Output is correct |
3 |
Correct |
63 ms |
40260 KB |
Output is correct |
4 |
Correct |
106 ms |
40704 KB |
Output is correct |
5 |
Correct |
30 ms |
41200 KB |
Output is correct |
6 |
Correct |
43 ms |
41424 KB |
Output is correct |
7 |
Correct |
103 ms |
41984 KB |
Output is correct |
8 |
Correct |
166 ms |
42832 KB |
Output is correct |
9 |
Correct |
64 ms |
48372 KB |
Output is correct |
10 |
Correct |
86 ms |
48588 KB |
Output is correct |
11 |
Correct |
170 ms |
49264 KB |
Output is correct |
12 |
Correct |
270 ms |
50044 KB |
Output is correct |
13 |
Correct |
143 ms |
57404 KB |
Output is correct |
14 |
Correct |
165 ms |
57644 KB |
Output is correct |
15 |
Correct |
261 ms |
58324 KB |
Output is correct |
16 |
Correct |
365 ms |
59120 KB |
Output is correct |
17 |
Correct |
698 ms |
58904 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Execution timed out |
5053 ms |
51384 KB |
Time limit exceeded |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
18 ms |
39380 KB |
Output is correct |
2 |
Correct |
18 ms |
39380 KB |
Output is correct |
3 |
Correct |
19 ms |
39384 KB |
Output is correct |
4 |
Correct |
18 ms |
39380 KB |
Output is correct |
5 |
Correct |
19 ms |
39508 KB |
Output is correct |
6 |
Correct |
19 ms |
39380 KB |
Output is correct |
7 |
Correct |
19 ms |
39452 KB |
Output is correct |
8 |
Correct |
18 ms |
39444 KB |
Output is correct |
9 |
Correct |
21 ms |
39392 KB |
Output is correct |
10 |
Correct |
21 ms |
39460 KB |
Output is correct |
11 |
Correct |
18 ms |
39380 KB |
Output is correct |
12 |
Correct |
18 ms |
39380 KB |
Output is correct |
13 |
Correct |
18 ms |
39492 KB |
Output is correct |
14 |
Correct |
19 ms |
39484 KB |
Output is correct |
15 |
Correct |
18 ms |
39412 KB |
Output is correct |
16 |
Correct |
19 ms |
39392 KB |
Output is correct |
17 |
Correct |
18 ms |
39508 KB |
Output is correct |
18 |
Correct |
19 ms |
39508 KB |
Output is correct |
19 |
Correct |
131 ms |
39616 KB |
Output is correct |
20 |
Correct |
140 ms |
39628 KB |
Output is correct |
21 |
Correct |
145 ms |
39636 KB |
Output is correct |
22 |
Correct |
164 ms |
39688 KB |
Output is correct |
23 |
Correct |
953 ms |
40092 KB |
Output is correct |
24 |
Correct |
982 ms |
40124 KB |
Output is correct |
25 |
Correct |
1073 ms |
40416 KB |
Output is correct |
26 |
Correct |
1219 ms |
40856 KB |
Output is correct |
27 |
Correct |
16 ms |
39436 KB |
Output is correct |
28 |
Correct |
22 ms |
39380 KB |
Output is correct |
29 |
Correct |
21 ms |
39508 KB |
Output is correct |
30 |
Correct |
26 ms |
39572 KB |
Output is correct |
31 |
Correct |
51 ms |
39816 KB |
Output is correct |
32 |
Correct |
24 ms |
39404 KB |
Output is correct |
33 |
Correct |
18 ms |
39508 KB |
Output is correct |
34 |
Correct |
21 ms |
39448 KB |
Output is correct |
35 |
Correct |
19 ms |
39460 KB |
Output is correct |
36 |
Correct |
26 ms |
39636 KB |
Output is correct |
37 |
Correct |
58 ms |
39896 KB |
Output is correct |
38 |
Correct |
20 ms |
39892 KB |
Output is correct |
39 |
Correct |
21 ms |
39892 KB |
Output is correct |
40 |
Correct |
23 ms |
39880 KB |
Output is correct |
41 |
Correct |
29 ms |
40020 KB |
Output is correct |
42 |
Correct |
68 ms |
40488 KB |
Output is correct |
43 |
Correct |
80 ms |
49220 KB |
Output is correct |
44 |
Correct |
85 ms |
49248 KB |
Output is correct |
45 |
Correct |
77 ms |
49268 KB |
Output is correct |
46 |
Correct |
100 ms |
49388 KB |
Output is correct |
47 |
Correct |
187 ms |
49824 KB |
Output is correct |
48 |
Correct |
20 ms |
39636 KB |
Output is correct |
49 |
Correct |
28 ms |
39780 KB |
Output is correct |
50 |
Correct |
63 ms |
40260 KB |
Output is correct |
51 |
Correct |
106 ms |
40704 KB |
Output is correct |
52 |
Correct |
30 ms |
41200 KB |
Output is correct |
53 |
Correct |
43 ms |
41424 KB |
Output is correct |
54 |
Correct |
103 ms |
41984 KB |
Output is correct |
55 |
Correct |
166 ms |
42832 KB |
Output is correct |
56 |
Correct |
64 ms |
48372 KB |
Output is correct |
57 |
Correct |
86 ms |
48588 KB |
Output is correct |
58 |
Correct |
170 ms |
49264 KB |
Output is correct |
59 |
Correct |
270 ms |
50044 KB |
Output is correct |
60 |
Correct |
143 ms |
57404 KB |
Output is correct |
61 |
Correct |
165 ms |
57644 KB |
Output is correct |
62 |
Correct |
261 ms |
58324 KB |
Output is correct |
63 |
Correct |
365 ms |
59120 KB |
Output is correct |
64 |
Correct |
698 ms |
58904 KB |
Output is correct |
65 |
Execution timed out |
5053 ms |
51384 KB |
Time limit exceeded |
66 |
Halted |
0 ms |
0 KB |
- |