#include <bits/stdc++.h>
using namespace std;
#define int long long
vector<int> adj[300005];
int a[300005];
deque<int> v[300005];
int mn[300005], sm[300005];
void dfs(int x) {
v[x].push_back(a[x]);
sm[x] = a[x];
mn[x] = min(a[x], 0LL);
vector<pair<int, int>> vec;
for(int i : adj[x]) {
dfs(i);
vec.push_back({-mn[i],i});
}
sort(vec.begin(), vec.end());
for(auto [m, idx] : vec) {
m = -m;
if(v[x].size() < v[idx].size()) {
swap(v[x], v[idx]);
while(v[idx].size()) {
v[x].push_front(v[idx].back());
v[idx].pop_back();
}
} else {
while(v[idx].size()) {
v[x].push_back(v[idx].front());
v[idx].pop_front();
}
}
mn[x] = min(mn[x], sm[x]+m);
sm[x] += sm[idx];
}
if(sm[x] <= 0) {
v[x].clear();
sm[x] = mn[x] = 0;
}
}
int32_t main() {
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
int n, s, x, ans = 0, cur = 0;
cin >> n >> s;
a[0] = s;
for(int i = 1; i <= n; i++) {
cin >> a[i] >> x;
adj[x].push_back(i);
}
dfs(0);
for(int i : v[0]) {
cur += i;
if(cur < 0) break;
ans = max(ans, cur);
}
cout << ans-s;
}
Compilation message
Main.cpp: In function 'void dfs(long long int)':
Main.cpp:21:11: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
21 | for(auto [m, idx] : vec) {
| ^
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
305 ms |
226648 KB |
Output is correct |
2 |
Correct |
287 ms |
226388 KB |
Output is correct |
3 |
Correct |
301 ms |
245456 KB |
Output is correct |
4 |
Correct |
232 ms |
240468 KB |
Output is correct |
5 |
Correct |
226 ms |
248008 KB |
Output is correct |
6 |
Correct |
200 ms |
222392 KB |
Output is correct |
7 |
Correct |
307 ms |
226384 KB |
Output is correct |
8 |
Correct |
308 ms |
245296 KB |
Output is correct |
9 |
Correct |
213 ms |
246356 KB |
Output is correct |
10 |
Correct |
226 ms |
248400 KB |
Output is correct |
11 |
Correct |
299 ms |
226796 KB |
Output is correct |
12 |
Correct |
276 ms |
225188 KB |
Output is correct |
13 |
Correct |
279 ms |
225584 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
86 ms |
214048 KB |
Output is correct |
2 |
Correct |
83 ms |
214096 KB |
Output is correct |
3 |
Incorrect |
83 ms |
214196 KB |
Output isn't correct |
4 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
86 ms |
214048 KB |
Output is correct |
2 |
Correct |
83 ms |
214096 KB |
Output is correct |
3 |
Incorrect |
83 ms |
214196 KB |
Output isn't correct |
4 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
86 ms |
214048 KB |
Output is correct |
2 |
Correct |
83 ms |
214096 KB |
Output is correct |
3 |
Incorrect |
83 ms |
214196 KB |
Output isn't correct |
4 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
305 ms |
226648 KB |
Output is correct |
2 |
Correct |
287 ms |
226388 KB |
Output is correct |
3 |
Correct |
301 ms |
245456 KB |
Output is correct |
4 |
Correct |
232 ms |
240468 KB |
Output is correct |
5 |
Correct |
226 ms |
248008 KB |
Output is correct |
6 |
Correct |
200 ms |
222392 KB |
Output is correct |
7 |
Correct |
307 ms |
226384 KB |
Output is correct |
8 |
Correct |
308 ms |
245296 KB |
Output is correct |
9 |
Correct |
213 ms |
246356 KB |
Output is correct |
10 |
Correct |
226 ms |
248400 KB |
Output is correct |
11 |
Correct |
299 ms |
226796 KB |
Output is correct |
12 |
Correct |
276 ms |
225188 KB |
Output is correct |
13 |
Correct |
279 ms |
225584 KB |
Output is correct |
14 |
Correct |
86 ms |
214048 KB |
Output is correct |
15 |
Correct |
83 ms |
214096 KB |
Output is correct |
16 |
Incorrect |
83 ms |
214196 KB |
Output isn't correct |
17 |
Halted |
0 ms |
0 KB |
- |