#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#include "race.h"
#include<vector>
using namespace std;
int n,k,ans,cnt=0,dis=0;
vector<vector<pair<int,int>>>v;
void dfs(int x,int p){
if(dis==k){
ans=min(ans,cnt);
return;
}
for(auto [z,w]:v[x]){
cnt++;
dis+=w;
if(z!=p && dis+w<=k) dfs(z,x);
cnt--;
dis-=w;
}
}
// void solve(int x){
// queue<array<int,4>>q;
// q.push({x,x,0,0});
// while(!q.empty()){
// auto [x,p,dis,cnt]=q.front();
// q.pop();
// if(dis==k){
// ans=min(ans,cnt);
// continue;
// }
// for(auto [z,w]:v[x]){
// if(z!=p && dis+w<=k){
// q.push({z,x,dis+w,cnt+1});
// }
// }
// }
// }
int best_path(int N, int K, int H[][2], int L[]){
n=N;
k=K;
vector<long long>pref(n);
pref[0]=0;
v.resize(n);
bool sub1=true;
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]});
pref[i+1]=pref[i]+L[i];
if(H[i][0]!=i || H[i][1]!=i+1) sub1=false;
}
ans=n;
if(sub1){
for(int i=0;i<n-1;i++){
auto pos=lower_bound(pref.begin(),pref.end(),pref[i]+K)-pref.begin();
if(pos!=n && pref[pos]-pref[i]==K) ans=min(ans,(int)pos-i);
}
return (ans==n ? -1 : ans);
}
for(int i=0;i<n;i++){
dfs(i,i);
}
return (ans==n ? -1 : ans);
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 2 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 3 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 4 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 5 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 6 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 7 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 8 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 9 |
Correct |
1 ms |
2392 KB |
Output is correct |
| 10 |
Correct |
1 ms |
2648 KB |
Output is correct |
| 11 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 12 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 13 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 14 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 15 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 16 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 17 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 18 |
Correct |
0 ms |
2396 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 2 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 3 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 4 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 5 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 6 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 7 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 8 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 9 |
Correct |
1 ms |
2392 KB |
Output is correct |
| 10 |
Correct |
1 ms |
2648 KB |
Output is correct |
| 11 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 12 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 13 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 14 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 15 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 16 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 17 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 18 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 19 |
Incorrect |
1 ms |
2396 KB |
Output isn't correct |
| 20 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 2 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 3 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 4 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 5 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 6 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 7 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 8 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 9 |
Correct |
1 ms |
2392 KB |
Output is correct |
| 10 |
Correct |
1 ms |
2648 KB |
Output is correct |
| 11 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 12 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 13 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 14 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 15 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 16 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 17 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 18 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 19 |
Incorrect |
1607 ms |
9652 KB |
Output isn't correct |
| 20 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 2 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 3 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 4 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 5 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 6 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 7 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 8 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 9 |
Correct |
1 ms |
2392 KB |
Output is correct |
| 10 |
Correct |
1 ms |
2648 KB |
Output is correct |
| 11 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 12 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 13 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 14 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 15 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 16 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 17 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 18 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 19 |
Incorrect |
1 ms |
2396 KB |
Output isn't correct |
| 20 |
Halted |
0 ms |
0 KB |
- |
