#include <bits/stdc++.h>
typedef long long ll;
#define pb push_back
#define MS(x,y) memset((x),(y),sizeof((x)))
#define MN 1000000001
using namespace std;
const int nsize = 100001;
int n,m,q;
int parent[nsize];
int sajz[nsize];
vector<int> pat[nsize];
bool vis[nsize];
int vred[nsize];
int dfsConst(int pos, int parnt) {
if (vis[pos]) return 0;
vis[pos] = true;
parent[pos] = parnt;
for (auto it:pat[pos]) {
sajz[pos] += dfsConst(it,pos);
}
return sajz[pos];
}
bool custComp(int a, int b) {
if (sajz[a] == sajz[b]) return a < b;
return sajz[a] < sajz[b];
}
int res = 0;
int dfs(int pos, int zbir) {
for (auto it:pat[pos]) {
if (it == parent[pos]) continue;
if (zbir+vred[it] > q) {
dfs(it,vred[it]);
res++;
} else {
zbir = dfs(it,zbir+vred[it]);
}
}
return zbir;
}
int main()
{
#if LOCAL_DEBUG
fstream cin("in.txt");
#endif
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
cin>>n>>q;
m = n-1;
for (int i = 0; i<n; i++) cin>>vred[i];
for (int i = 0; i<m; i++) {
int a,b;
cin>>a>>b;
a--; b--;
pat[a].pb(b);
pat[b].pb(a);
}
MS(vis,0);
for (int i = 0; i<n; i++) sajz[i] = vred[i];
dfsConst(0,0);
for (int i = 0; i<n; i++) sort(pat[i].begin(),pat[i].end(),custComp);
dfs(0,vred[0]);
cout<<res<<endl;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
2 ms |
2772 KB |
Output is correct |
2 |
Correct |
2 ms |
2688 KB |
Output is correct |
3 |
Correct |
1 ms |
2772 KB |
Output is correct |
4 |
Correct |
2 ms |
2772 KB |
Output is correct |
5 |
Incorrect |
2 ms |
2772 KB |
Output isn't correct |
6 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
47 ms |
15264 KB |
Output is correct |
2 |
Correct |
55 ms |
15276 KB |
Output is correct |
3 |
Correct |
43 ms |
15268 KB |
Output is correct |
4 |
Correct |
45 ms |
15208 KB |
Output is correct |
5 |
Correct |
39 ms |
15224 KB |
Output is correct |
6 |
Correct |
40 ms |
15172 KB |
Output is correct |
7 |
Correct |
39 ms |
15136 KB |
Output is correct |
8 |
Correct |
38 ms |
14708 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
2 ms |
2772 KB |
Output is correct |
2 |
Correct |
2 ms |
2688 KB |
Output is correct |
3 |
Correct |
1 ms |
2772 KB |
Output is correct |
4 |
Correct |
2 ms |
2772 KB |
Output is correct |
5 |
Incorrect |
2 ms |
2772 KB |
Output isn't correct |
6 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
2 ms |
2772 KB |
Output is correct |
2 |
Correct |
2 ms |
2688 KB |
Output is correct |
3 |
Correct |
1 ms |
2772 KB |
Output is correct |
4 |
Correct |
2 ms |
2772 KB |
Output is correct |
5 |
Incorrect |
2 ms |
2772 KB |
Output isn't correct |
6 |
Halted |
0 ms |
0 KB |
- |