#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
#define ff first
#define ss second
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define lb lower_bound
const int LOG = 25;
struct Line{
int m, c;
Line(int m = 0, int c = 0) : m(m), c(c) {}
int calc(int x) { return m * x + c; }
};
ld intX(Line A, Line B) {
return (ld)(B.c - A.c) / (ld)(A.m - B.m);
}
int N, S[100005], V[100005], DP[100005];
vector<array<int, 2>> adj[100005];
Line hull[100005]; int st = 0;
int query(int v) {
int lo = 0, hi = st - 1, ans = 0;
while(lo <= hi) {
int md = (lo + hi) / 2;
if(intX(hull[md], hull[md + 1]) < v)
lo = md + 1;
else ans = md, hi = md - 1;
}
return hull[ans].calc(v);
}
int update(Line i) {
if(st < 2 || intX(i, hull[st - 1]) >= intX(i, hull[st - 2]))
return st;
int lo = 1, hi = st - 1, ans = 1;
while(lo <= hi) {
int md = (lo + hi) / 2;
if(intX(i, hull[md]) < intX(hull[md], hull[md - 1]))
ans = md, hi = md - 1;
else lo = md + 1;
}
return ans;
}
int solve(int v, int p, int d) {
int prev_size, prev_pos;
Line prev_line;
if(v == 1) {
DP[v] = 0;
hull[st++] = {0, 0};
}
else {
DP[v] = query(S[v]) + d * S[v] + V[v];
Line i(-d, DP[v]);
prev_size = st;
prev_pos = st = update(i);
prev_line = hull[st];
hull[st++] = i;
}
for(auto u : adj[v]) {
if(u[0] == p) continue;
solve(u[0], v, d + u[1]);
}
if(v != 1) {
st = prev_size;
hull[prev_pos] = prev_line;
}
}
int32_t main() {
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
cin >> N; memset(DP, -1, sizeof DP);
for(int l = 0; l < N - 1; l++) {
int U, V, C; cin >> U >> V >> C;
adj[U].push_back({V, C});
adj[V].push_back({U, C});
}
for(int l = 2; l <= N; l++)
cin >> V[l] >> S[l];
solve(1, 1, 0);
for(int l = 2; l <= N; l++)
cout << DP[l] << " ";
return 0;
}
Compilation message
harbingers.cpp: In function 'int solve(int, int, int)':
harbingers.cpp:80:13: warning: no return statement in function returning non-void [-Wreturn-type]
80 | }
| ^
harbingers.cpp:78:36: warning: 'prev_pos' may be used uninitialized in this function [-Wmaybe-uninitialized]
78 | hull[prev_pos] = prev_line;
| ~~~~~~~~~~~~~~~^~~~~~~~~~~
harbingers.cpp:77:24: warning: 'prev_size' may be used uninitialized in this function [-Wmaybe-uninitialized]
77 | st = prev_size;
| ~~~^~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
6 ms |
7724 KB |
Execution killed with signal 11 |
| 2 |
Runtime error |
9 ms |
8276 KB |
Execution killed with signal 11 |
| 3 |
Runtime error |
37 ms |
17260 KB |
Execution killed with signal 11 |
| 4 |
Runtime error |
51 ms |
21972 KB |
Execution killed with signal 11 |
| 5 |
Runtime error |
63 ms |
26672 KB |
Execution killed with signal 11 |
| 6 |
Runtime error |
111 ms |
31516 KB |
Execution killed with signal 11 |
| 7 |
Runtime error |
47 ms |
13516 KB |
Execution killed with signal 11 |
| 8 |
Runtime error |
71 ms |
22336 KB |
Execution killed with signal 11 |
| 9 |
Runtime error |
56 ms |
16324 KB |
Execution killed with signal 11 |
| 10 |
Runtime error |
58 ms |
24264 KB |
Execution killed with signal 11 |
