#include "bits/stdc++.h"
using namespace std;
#ifdef Nero
#include "Deb.h"
#else
#define deb(...)
#endif
const int N = 5002;
long long dis[N];
long long mn[N], mx[N];
vector<pair<int, int>> g[N];
void dfs(int v) {
if (g[v].size() == 0) {
mn[v] = mx[v] = dis[v];
return;
}
mn[v] = LLONG_MAX;
mx[v] = -LLONG_MAX;
for (auto [u, w] : g[v]) {
dis[u] = dis[v] + w;
dfs(u);
mn[v] = min(mn[v], mn[u]);
mx[v] = max(mx[v], mx[u]);
}
}
long long dfs2(int v, long long add, const long long req) {
long long ret = 0;
for (auto [u, w] : g[v]) {
long long t = 0, r = 1;
if (mn[u] + add > req) {
assert(add <= 0);
r = -1;
t = min((long long) w, mn[u] + add - req);
} else if (mx[u] + add < req) {
assert(add >= 0);
t = min((long long) w, req - (mx[u] + add));
}
ret += t + dfs2(u, add + t * r, req);
}
return ret;
}
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int n, m;
cin >> n >> m;
for(int i = 2; i <= n + m; ++i) {
int p, c;
cin >> p >> c;
g[p].emplace_back(i, c);
}
dfs(1);
long long ans = LLONG_MAX;
for (int i = 1; i <= 305; ++i) {
ans = min(ans, dfs2(1, 0, i));
}
cout << ans << '\n';
return 0;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
1 ms |
344 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
1 ms |
344 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
1 ms |
344 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |