#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;
int to[maxn];
pair<int, int> edges[maxn * 2];
int adj_pt[maxn];
int par[maxn];
int len[maxn];
int depth[maxn];
pair<long long, int> dp[maxn];
bool flag[maxn];
bool is_cycle[maxn];
int cycle[maxn];
int sz;
void dfs1(int u) {
flag[u] = true;
for (int pt = adj_pt[u]; edges[pt].first == u; pt++) {
int id = edges[pt].second;
if (id == par[u]) {
continue;
}
int v = id ^ to[id] ^ u;
if (!flag[v]) {
depth[v] = depth[u] + 1;
par[v] = id;
dfs1(v);
}
else {
if (depth[u] > depth[v]) {
int cur = u;
while (cur != v) {
cycle[sz] = cur;
sz++;
cur = par[cur] ^ to[par[cur]] ^ cur;
}
cycle[sz] = v;
sz++;
}
}
}
}
/*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;
assert(n <= 1000000);
for (int i = 1; i <= n; i++) {
cin >> to[i] >> len[i];
edges[i * 2 - 1] = make_pair(i, i);
edges[i * 2] = make_pair(to[i], i);
}
sort(edges + 1, edges + n * 2 + 1);
for (int i = 1; i <= n * 2; i++) {
if (edges[i].first != edges[i - 1].first) {
adj_pt[edges[i].first] = i;
}
}
long long res = 0;
for (int u = 1; u <= n; u++) {
if (!flag[u]) {
sz = 0;
//lens.clear();
//max_depth.clear();
par[u] = -1;
dfs1(u);
//res += solve();
}
}
cout << res;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1 ms |
340 KB |
Output isn't correct |
| 2 |
Incorrect |
1 ms |
340 KB |
Output isn't correct |
| 3 |
Incorrect |
1 ms |
340 KB |
Output isn't correct |
| 4 |
Incorrect |
0 ms |
340 KB |
Output isn't correct |
| 5 |
Incorrect |
1 ms |
340 KB |
Output isn't correct |
| 6 |
Incorrect |
1 ms |
340 KB |
Output isn't correct |
| 7 |
Incorrect |
0 ms |
340 KB |
Output isn't correct |
| 8 |
Incorrect |
1 ms |
340 KB |
Output isn't correct |
| 9 |
Incorrect |
0 ms |
340 KB |
Output isn't correct |
| 10 |
Incorrect |
1 ms |
340 KB |
Output isn't correct |
| 11 |
Incorrect |
1 ms |
340 KB |
Output isn't correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1 ms |
340 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1 ms |
340 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
8 ms |
1144 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
18 ms |
3480 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
55 ms |
8924 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
121 ms |
15844 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
288 ms |
36404 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
266 ms |
97656 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
