# |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
978177 |
2024-05-09T02:24:39 Z |
LOLOLO |
Traffic (IOI10_traffic) |
C++17 |
|
12 ms |
23900 KB |
#include <bits/stdc++.h>
#define ll long long
using namespace std;
#define f first
#define s second
#define pb push_back
#define ep emplace
#define eb emplace_back
#define lb lower_bound
#define ub upper_bound
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define uniquev(v) sort(all(v)), (v).resize(unique(all(v)) - (v).begin())
#define mem(f,x) memset(f , x , sizeof(f))
#define sz(x) (int)(x).size()
#define __lcm(a, b) (1ll * ((a) / __gcd((a), (b))) * (b))
#define mxx *max_element
#define mnn *min_element
#define cntbit(x) __builtin_popcountll(x)
#define len(x) (int)(x.length())
const int N = 1e6 + 10;
vector <int> ed[N];
ll f[N], a[N], sum[N];
void dfs(int u, int v) {
sum[u] = a[u];
if (u != v) {
auto it = find(all(ed[u]), v);
ed[u].erase(it);
}
for (auto x : ed[u]) {
dfs(x, u);
sum[u] += sum[x];
f[u] = max(f[u], sum[x]);
}
}
//before -> u is v's parent
void reroot(int u, int v) {
f[v] = max(f[v], f[u] + a[u]);
}
ll ans = 1e18, id = 0;
void dfs2(int u) {
if (ans > f[u]) {
ans = f[u];
id = u;
}
sort(all(ed[u]), [&] (int x, int y) {return sum[x] > sum[y];});
for (int i = 0; i < sz(ed[u]); i++) {
int x = ed[u][i];
ll p1 = f[u], p2 = f[x];
if (sz(ed[u]) == 1) {
f[u] = 0;
} else {
if (i == 0) {
f[u] = sum[ed[u][1]];
} else {
f[u] = sum[ed[u][0]];
}
}
reroot(u, x);
dfs2(x);
f[u] = p1, f[x] = p2;
}
}
int LocateCentre(int n, int P[], int S[], int D[]) {
ans = 1e18;
for (int i = 0; i < n - 1; i++) {
ed[S[i]].pb(D[i]);
ed[D[i]].pb(S[i]);
}
for (int i = 0; i < n; i++)
a[i] = P[i];
dfs(0, 0);
dfs2(0);
return id;
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
12 ms |
23896 KB |
Output is correct |
2 |
Incorrect |
12 ms |
23900 KB |
Output isn't correct |
3 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
12 ms |
23896 KB |
Output is correct |
2 |
Incorrect |
12 ms |
23900 KB |
Output isn't correct |
3 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
12 ms |
23896 KB |
Output is correct |
2 |
Incorrect |
12 ms |
23900 KB |
Output isn't correct |
3 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
12 ms |
23896 KB |
Output is correct |
2 |
Incorrect |
12 ms |
23900 KB |
Output isn't correct |
3 |
Halted |
0 ms |
0 KB |
- |