#include <bits/stdc++.h>
using namespace std;
void just_do_it();
int main() {
#ifdef KAMIRULEZ
freopen("kamirulez.inp", "r", stdin);
freopen("kamirulez.out", "w", stdout);
#endif
ios_base::sync_with_stdio(0);
cin.tie(0);
just_do_it();
return 0;
}
const int maxn = 1e6 + 20;
vector<pair<int, int>> adj[maxn];
pair<int, int> par[maxn];
int len[maxn];
int depth[maxn];
pair<long long, int> dp[maxn];
bool flag[maxn];
bool is_cycle[maxn];
vector<int> cycle;
vector<int> lens;
vector<long long> max_depth;
void dfs1(int u) {
flag[u] = true;
for (auto e: adj[u]) {
int v = e.first;
int id = e.second;
if (id == par[u].second) {
continue;
}
if (!flag[v]) {
depth[v] = depth[u] + 1;
par[v] = make_pair(u, id);
dfs1(v);
}
else {
/* if (depth[u] > depth[v]) {
int cur = u;
int cnt = 0;
while (cur != v) {
cnt++;
//cycle.push_back(cur);
//lens.push_back(len[par[cur].second]);
cur = par[cur].first;
}
cnt++;
assert(cnt < maxn);
//cycle.push_back(v);
//lens.push_back(len[id]);
}*/
}
}
}
void dfs2(int u, int p) {
dp[u] = make_pair(0, u);
for (auto e: adj[u]) {
int v = e.first;
int id = e.second;
if (v != p && !is_cycle[v]) {
dfs2(v, u);
dp[u] = max(dp[u], make_pair(dp[v].first + len[id], dp[v].second));
}
}
}
/*long long solve() {
int n = cycle.size();
for (int i = 0; i < n; i++) {
is_cycle[cycle[i].u] = true;
}
long long res = 0;
for (int i = 0; i < n; i++) {
int u = cycle[i].u;
is_cycle[u] = false;
dfs2(u, -1);
cycle[i].max_depth = max_depth[u].first;
int v = max_depth[u].second;
dfs2(v, -1);
res = max(res, max_depth[v].first);
is_cycle[u] = true;
}
vector<long long> dist(n);
long long mx = cycle[0].max_depth;
for (int i = 1; i < n; i++) {
dist[i] = dist[i - 1] + cycle[i - 1].len;
res = max(res, dist[i] + cycle[i].max_depth + mx);
mx = max(mx, cycle[i].max_depth - dist[i]);
}
long long sum = dist[n - 1] + cycle[n - 1].len;
mx = cycle[0].max_depth;
for (int i = 1; i < n; i++) {
res = max(res, (sum - dist[i]) + cycle[i].max_depth + mx);
mx = max(mx, cycle[i].max_depth + dist[i]);
}
return res;
}*/
void just_do_it() {
int n;
cin >> n;
for (int u = 1; u <= n; u++) {
int v;
cin >> v >> len[u];
adj[u].emplace_back(v, u);
adj[v].emplace_back(u, u);
}
long long res = 0;
for (int u = 1; u <= n; u++) {
if (!flag[u]) {
//cycle.clear();
//lens.clear();
//max_depth.clear();
par[u] = make_pair(-1, -1);
dfs1(u);
//res += solve();
}
}
cout << res;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
16 ms |
23764 KB |
Output isn't correct |
| 2 |
Incorrect |
13 ms |
23856 KB |
Output isn't correct |
| 3 |
Incorrect |
17 ms |
23764 KB |
Output isn't correct |
| 4 |
Incorrect |
13 ms |
23764 KB |
Output isn't correct |
| 5 |
Incorrect |
14 ms |
23744 KB |
Output isn't correct |
| 6 |
Incorrect |
16 ms |
23744 KB |
Output isn't correct |
| 7 |
Incorrect |
15 ms |
23816 KB |
Output isn't correct |
| 8 |
Incorrect |
13 ms |
23724 KB |
Output isn't correct |
| 9 |
Incorrect |
16 ms |
23764 KB |
Output isn't correct |
| 10 |
Incorrect |
13 ms |
23764 KB |
Output isn't correct |
| 11 |
Incorrect |
13 ms |
23768 KB |
Output isn't correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
17 ms |
23924 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
17 ms |
23892 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
20 ms |
24732 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
42 ms |
27712 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
83 ms |
35744 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
153 ms |
45616 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
280 ms |
79580 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
352 ms |
131072 KB |
Execution killed with signal 9 |
| 2 |
Halted |
0 ms |
0 KB |
- |
