#include<bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
const int RANDOM = chrono::high_resolution_clock::now().time_since_epoch().count();
struct chash {
int operator()(int x) const { return x ^ RANDOM; }
};
const int N=200005;
int sz[N], e[N], z1[N], z2[N], o, k, K, Ans=N;
vector <pair<int, int> > v[N];
gp_hash_table<int, int, chash> m[N];
void solve(int x=0, int pa=0){
sz[x]=1;
int mx=0, Y, D;
for (auto [y,d]:v[x]){
if(y==pa)continue;
solve(y, x);
sz[x]+=sz[y];
if(sz[y]>mx) mx=sz[y], Y=y, D=d;
}
if(sz[x]==1) e[x]=o++;
else z1[x]=z1[Y]+D, z2[x]=z2[Y]+1, e[x]=e[Y];
m[e[x]][0-z1[x]]=0-z2[x];
for (auto [y,d]:v[x]){
if(y==pa||y==Y)continue;
for(auto [kk,ans]:m[e[y]]){
k=kk+d+z1[y]+z1[x];
ans+=1+z2[y]+z2[x];
if(m[e[x]].find(K-k)!=m[e[x]].end()) Ans=min(Ans, ans+m[e[x]][K-k]);
}
for(auto [kk,ans]:m[e[y]]){
k=kk+d+z1[y]-z1[x];
ans+=1+z2[y]-z2[x];
if(m[e[x]].find(k)==m[e[x]].end() || m[e[x]][k]>ans) m[e[x]][k]=ans;
}
}
if(m[e[x]].find(K-z1[x])!=m[e[x]].end())Ans=min(Ans,z2[x]+m[e[x]][K-z1[x]]);
}
int best_path(int n, int k, int H[][2], int L[]){
K=k;
for (int i=0; i<n-1; i++)
v[H[i][0]].push_back({H[i][1],L[i]}),
v[H[i][1]].push_back({H[i][0],L[i]});
solve();
return (Ans==N)?-1:Ans;
}
Compilation message
race.cpp: In function 'void solve(int, int)':
race.cpp:33:11: warning: 'Y' may be used uninitialized in this function [-Wmaybe-uninitialized]
33 | if(y==pa||y==Y)continue;
| ~~~~~^~~~~~
race.cpp:29:18: warning: 'D' may be used uninitialized in this function [-Wmaybe-uninitialized]
29 | else z1[x]=z1[Y]+D, z2[x]=z2[Y]+1, e[x]=e[Y];
| ~~~~~^~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
53 ms |
47340 KB |
Output is correct |
| 2 |
Correct |
52 ms |
47488 KB |
Output is correct |
| 3 |
Correct |
53 ms |
47340 KB |
Output is correct |
| 4 |
Correct |
49 ms |
47468 KB |
Output is correct |
| 5 |
Correct |
54 ms |
47340 KB |
Output is correct |
| 6 |
Correct |
55 ms |
47468 KB |
Output is correct |
| 7 |
Correct |
52 ms |
47340 KB |
Output is correct |
| 8 |
Correct |
52 ms |
47340 KB |
Output is correct |
| 9 |
Correct |
54 ms |
47360 KB |
Output is correct |
| 10 |
Correct |
52 ms |
47360 KB |
Output is correct |
| 11 |
Correct |
53 ms |
47340 KB |
Output is correct |
| 12 |
Correct |
54 ms |
47340 KB |
Output is correct |
| 13 |
Correct |
52 ms |
47340 KB |
Output is correct |
| 14 |
Correct |
52 ms |
47340 KB |
Output is correct |
| 15 |
Correct |
51 ms |
47344 KB |
Output is correct |
| 16 |
Correct |
53 ms |
47468 KB |
Output is correct |
| 17 |
Correct |
54 ms |
47340 KB |
Output is correct |
| 18 |
Correct |
52 ms |
47468 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
53 ms |
47340 KB |
Output is correct |
| 2 |
Correct |
52 ms |
47488 KB |
Output is correct |
| 3 |
Correct |
53 ms |
47340 KB |
Output is correct |
| 4 |
Correct |
49 ms |
47468 KB |
Output is correct |
| 5 |
Correct |
54 ms |
47340 KB |
Output is correct |
| 6 |
Correct |
55 ms |
47468 KB |
Output is correct |
| 7 |
Correct |
52 ms |
47340 KB |
Output is correct |
| 8 |
Correct |
52 ms |
47340 KB |
Output is correct |
| 9 |
Correct |
54 ms |
47360 KB |
Output is correct |
| 10 |
Correct |
52 ms |
47360 KB |
Output is correct |
| 11 |
Correct |
53 ms |
47340 KB |
Output is correct |
| 12 |
Correct |
54 ms |
47340 KB |
Output is correct |
| 13 |
Correct |
52 ms |
47340 KB |
Output is correct |
| 14 |
Correct |
52 ms |
47340 KB |
Output is correct |
| 15 |
Correct |
51 ms |
47344 KB |
Output is correct |
| 16 |
Correct |
53 ms |
47468 KB |
Output is correct |
| 17 |
Correct |
54 ms |
47340 KB |
Output is correct |
| 18 |
Correct |
52 ms |
47468 KB |
Output is correct |
| 19 |
Correct |
49 ms |
47340 KB |
Output is correct |
| 20 |
Correct |
54 ms |
47340 KB |
Output is correct |
| 21 |
Correct |
53 ms |
47468 KB |
Output is correct |
| 22 |
Correct |
57 ms |
47468 KB |
Output is correct |
| 23 |
Correct |
54 ms |
47596 KB |
Output is correct |
| 24 |
Correct |
53 ms |
47468 KB |
Output is correct |
| 25 |
Correct |
53 ms |
47468 KB |
Output is correct |
| 26 |
Correct |
53 ms |
47468 KB |
Output is correct |
| 27 |
Correct |
50 ms |
47468 KB |
Output is correct |
| 28 |
Correct |
54 ms |
47468 KB |
Output is correct |
| 29 |
Correct |
53 ms |
47468 KB |
Output is correct |
| 30 |
Correct |
54 ms |
47468 KB |
Output is correct |
| 31 |
Correct |
53 ms |
47724 KB |
Output is correct |
| 32 |
Correct |
53 ms |
47468 KB |
Output is correct |
| 33 |
Correct |
56 ms |
47468 KB |
Output is correct |
| 34 |
Correct |
52 ms |
47468 KB |
Output is correct |
| 35 |
Correct |
52 ms |
47468 KB |
Output is correct |
| 36 |
Correct |
65 ms |
47596 KB |
Output is correct |
| 37 |
Correct |
52 ms |
47468 KB |
Output is correct |
| 38 |
Correct |
52 ms |
47468 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
53 ms |
47340 KB |
Output is correct |
| 2 |
Correct |
52 ms |
47488 KB |
Output is correct |
| 3 |
Correct |
53 ms |
47340 KB |
Output is correct |
| 4 |
Correct |
49 ms |
47468 KB |
Output is correct |
| 5 |
Correct |
54 ms |
47340 KB |
Output is correct |
| 6 |
Correct |
55 ms |
47468 KB |
Output is correct |
| 7 |
Correct |
52 ms |
47340 KB |
Output is correct |
| 8 |
Correct |
52 ms |
47340 KB |
Output is correct |
| 9 |
Correct |
54 ms |
47360 KB |
Output is correct |
| 10 |
Correct |
52 ms |
47360 KB |
Output is correct |
| 11 |
Correct |
53 ms |
47340 KB |
Output is correct |
| 12 |
Correct |
54 ms |
47340 KB |
Output is correct |
| 13 |
Correct |
52 ms |
47340 KB |
Output is correct |
| 14 |
Correct |
52 ms |
47340 KB |
Output is correct |
| 15 |
Correct |
51 ms |
47344 KB |
Output is correct |
| 16 |
Correct |
53 ms |
47468 KB |
Output is correct |
| 17 |
Correct |
54 ms |
47340 KB |
Output is correct |
| 18 |
Correct |
52 ms |
47468 KB |
Output is correct |
| 19 |
Correct |
163 ms |
58860 KB |
Output is correct |
| 20 |
Correct |
147 ms |
58732 KB |
Output is correct |
| 21 |
Correct |
156 ms |
58732 KB |
Output is correct |
| 22 |
Correct |
156 ms |
58476 KB |
Output is correct |
| 23 |
Correct |
167 ms |
64236 KB |
Output is correct |
| 24 |
Correct |
150 ms |
61932 KB |
Output is correct |
| 25 |
Correct |
123 ms |
63148 KB |
Output is correct |
| 26 |
Correct |
109 ms |
70636 KB |
Output is correct |
| 27 |
Correct |
222 ms |
64492 KB |
Output is correct |
| 28 |
Correct |
251 ms |
103008 KB |
Output is correct |
| 29 |
Correct |
248 ms |
100836 KB |
Output is correct |
| 30 |
Correct |
230 ms |
64492 KB |
Output is correct |
| 31 |
Correct |
228 ms |
64604 KB |
Output is correct |
| 32 |
Correct |
263 ms |
64564 KB |
Output is correct |
| 33 |
Correct |
207 ms |
67308 KB |
Output is correct |
| 34 |
Correct |
299 ms |
83576 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
53 ms |
47340 KB |
Output is correct |
| 2 |
Correct |
52 ms |
47488 KB |
Output is correct |
| 3 |
Correct |
53 ms |
47340 KB |
Output is correct |
| 4 |
Correct |
49 ms |
47468 KB |
Output is correct |
| 5 |
Correct |
54 ms |
47340 KB |
Output is correct |
| 6 |
Correct |
55 ms |
47468 KB |
Output is correct |
| 7 |
Correct |
52 ms |
47340 KB |
Output is correct |
| 8 |
Correct |
52 ms |
47340 KB |
Output is correct |
| 9 |
Correct |
54 ms |
47360 KB |
Output is correct |
| 10 |
Correct |
52 ms |
47360 KB |
Output is correct |
| 11 |
Correct |
53 ms |
47340 KB |
Output is correct |
| 12 |
Correct |
54 ms |
47340 KB |
Output is correct |
| 13 |
Correct |
52 ms |
47340 KB |
Output is correct |
| 14 |
Correct |
52 ms |
47340 KB |
Output is correct |
| 15 |
Correct |
51 ms |
47344 KB |
Output is correct |
| 16 |
Correct |
53 ms |
47468 KB |
Output is correct |
| 17 |
Correct |
54 ms |
47340 KB |
Output is correct |
| 18 |
Correct |
52 ms |
47468 KB |
Output is correct |
| 19 |
Correct |
49 ms |
47340 KB |
Output is correct |
| 20 |
Correct |
54 ms |
47340 KB |
Output is correct |
| 21 |
Correct |
53 ms |
47468 KB |
Output is correct |
| 22 |
Correct |
57 ms |
47468 KB |
Output is correct |
| 23 |
Correct |
54 ms |
47596 KB |
Output is correct |
| 24 |
Correct |
53 ms |
47468 KB |
Output is correct |
| 25 |
Correct |
53 ms |
47468 KB |
Output is correct |
| 26 |
Correct |
53 ms |
47468 KB |
Output is correct |
| 27 |
Correct |
50 ms |
47468 KB |
Output is correct |
| 28 |
Correct |
54 ms |
47468 KB |
Output is correct |
| 29 |
Correct |
53 ms |
47468 KB |
Output is correct |
| 30 |
Correct |
54 ms |
47468 KB |
Output is correct |
| 31 |
Correct |
53 ms |
47724 KB |
Output is correct |
| 32 |
Correct |
53 ms |
47468 KB |
Output is correct |
| 33 |
Correct |
56 ms |
47468 KB |
Output is correct |
| 34 |
Correct |
52 ms |
47468 KB |
Output is correct |
| 35 |
Correct |
52 ms |
47468 KB |
Output is correct |
| 36 |
Correct |
65 ms |
47596 KB |
Output is correct |
| 37 |
Correct |
52 ms |
47468 KB |
Output is correct |
| 38 |
Correct |
52 ms |
47468 KB |
Output is correct |
| 39 |
Correct |
163 ms |
58860 KB |
Output is correct |
| 40 |
Correct |
147 ms |
58732 KB |
Output is correct |
| 41 |
Correct |
156 ms |
58732 KB |
Output is correct |
| 42 |
Correct |
156 ms |
58476 KB |
Output is correct |
| 43 |
Correct |
167 ms |
64236 KB |
Output is correct |
| 44 |
Correct |
150 ms |
61932 KB |
Output is correct |
| 45 |
Correct |
123 ms |
63148 KB |
Output is correct |
| 46 |
Correct |
109 ms |
70636 KB |
Output is correct |
| 47 |
Correct |
222 ms |
64492 KB |
Output is correct |
| 48 |
Correct |
251 ms |
103008 KB |
Output is correct |
| 49 |
Correct |
248 ms |
100836 KB |
Output is correct |
| 50 |
Correct |
230 ms |
64492 KB |
Output is correct |
| 51 |
Correct |
228 ms |
64604 KB |
Output is correct |
| 52 |
Correct |
263 ms |
64564 KB |
Output is correct |
| 53 |
Correct |
207 ms |
67308 KB |
Output is correct |
| 54 |
Correct |
299 ms |
83576 KB |
Output is correct |
| 55 |
Correct |
63 ms |
49132 KB |
Output is correct |
| 56 |
Correct |
58 ms |
48364 KB |
Output is correct |
| 57 |
Correct |
114 ms |
57704 KB |
Output is correct |
| 58 |
Correct |
97 ms |
53472 KB |
Output is correct |
| 59 |
Correct |
115 ms |
75104 KB |
Output is correct |
| 60 |
Correct |
277 ms |
101860 KB |
Output is correct |
| 61 |
Correct |
250 ms |
66584 KB |
Output is correct |
| 62 |
Correct |
226 ms |
64620 KB |
Output is correct |
| 63 |
Correct |
267 ms |
64492 KB |
Output is correct |
| 64 |
Correct |
392 ms |
91752 KB |
Output is correct |
| 65 |
Correct |
394 ms |
90640 KB |
Output is correct |
| 66 |
Correct |
263 ms |
96480 KB |
Output is correct |
| 67 |
Correct |
221 ms |
61412 KB |
Output is correct |
| 68 |
Correct |
314 ms |
77340 KB |
Output is correct |
| 69 |
Correct |
316 ms |
77468 KB |
Output is correct |
| 70 |
Correct |
306 ms |
76444 KB |
Output is correct |
